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Delvin aman

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Papers by Delvin aman

Linker regulation of Cu/C@CoO derived from self-assembly of MOF to boost catalytic activity of organic contaminates

The reduction of harmful organic contaminants in agricultural wastewater to their corresponding a... more The reduction of harmful organic contaminants in agricultural wastewater to their corresponding amines is a key procedure in the fine chemical industry for pharmaceuticals, polymers, agrochemicals, and dyes. However, their effective and selective reduction reactions require compressed hydrogen at high temperatures and include noble metal catalysts, which are expensive and limited in supply. In this study, we present a novel approach using a layer-by-layer assembly of copper (Cu) metal-organic frameworks (MOFs) to prepare an earth-abundant, highly stable plasmonic nano-photocatalyst (that is, Cu nanoparticles (NPs)) over Co3O4 nanocubes (marked as CoO@Cu/C). The catalyst was produced by the thermal treatment of the prepared core-shell material, in which well-dispersed Cu NPs with the average size down of 5 nm high monodispersed were embedded in the carbon shell on the surface of CoO. This unique composition led to a significant enhancement in catalytic performance, yielding remarkabl...

Preparation and Characterization of Conductive Polymer/Reduced Graphite Oxide (RGO) Composite via Miniemulsion Polymerization

Chemical and Process Engineering Research, 2015

Polymer/reduced graphite oxide (rGO) composite nanoparticles were prepared via miniemulsion polym... more Polymer/reduced graphite oxide (rGO) composite nanoparticles were prepared via miniemulsion polymerization. The rGO was modified with a reactive surfactant, 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS). The AMPS-modified rGO was emulsified in the presence of styrene (St) and Methyl meth acrylate (MMA) monomers, and the stable miniemulsion was polymerized to form poly (St-coMMA)/rGO composite latex nanoparticles. The structure and morphology of the composite were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) and particle size distribution of prepared composite by zeta seizer (ZS). The electrical conductivity of the reduced graphene polymer composite has been measured to be approximatel 2.5 S cm-1

PLLA Nanosheets for Wound Healing: Embedding with Iron-Ion-Containing Nanoparticles

: This article reports on polymer (PLLA, poly(L-lactic acid)) nanosheets incorporated with Fe-ion... more : This article reports on polymer (PLLA, poly(L-lactic acid)) nanosheets incorporated with Fe-ion nanoparticles, aiming at using the latter nanoparticles as source to release Fe ions to facilitate burn wound healing when such nanosheets are applied on skin as biomedical tissue. Laser ablation in liquid phase was used to produce Fe-containing nanoparticles that after incorporation into PLLA nanosheets would release Fe ions when in immersed in water. Such nanoparticles prepared in chloroform are shown by XPS to be based on iron chloride and oxide phases. After incorporation into PLLA nanosheets, the ion –release test demonstrated that Fe ions could be released successfully into water at pH 7.4, which implies that such polymer nanosheets show promise for biomedical applications as potential patches for healing burn wounds. Incorporation with two different metal ions (Fe and Zn) is shown to be efficient and both types of ions were demonstrated to be released simultaneously and with comparable release rates.

Perovskite nanomaterials with exceptional photocatalytic properties for oxidative desulfurization of dibenzothiophene

Journal of Industrial and Engineering Chemistry

MOF-derived core–shell MnO@Cu/C as high-efficiency catalyst for reduction of nitroarenes

Chemical Engineering Journal

A Novel Bioremediation Technique for Petroleum Hydrocarbons by Bacterial Consortium Immobilized on Goethite-chitosan Nanocomposite

Soil and Sediment Contamination: An International Journal, 2021

ABSTRACT Environmental pollution by petroleum hydrocarbon is one of the significant concerns of t... more ABSTRACT Environmental pollution by petroleum hydrocarbon is one of the significant concerns of the contemporary world. This paper deals with the relevant environmental issues concerning the oil pollution of the petroleum industry. There is a need for further development of sustainable remediation technologies. Nineteen petroleum-degrading bacteria were isolated from an oil-polluted soil in the Suez oil processing company in Egypt. However, two bacterial species showed the highest growth rate of oil hydrocarbons. These isolates were identified by 16S rDNA gene sequence analysis into Flavobacterium johnsoniae BS1 (NCBI Gene Bank Accession no. MT740243) and Shewanella baltica BS2 (NCBI Gene Bank Accession no. MT740157). Ionic liquids prepared the goethite-chitosan nanocomposite assisted synthetic hydrothermal method. The antibacterial activity of synthesized nanocomposite on BS1and BS2 was determined. The two oil-degrading bacterial strains were immobilized onto the surface of the prepared nanocomposite. Pure and bacterial consortium studied the bioremediation process without/with nanocomposite. The remaining oil after bioremediation was extracted. Study results demonstrated that the affinity between the surface of bacterial cells and the prepared nanocomposite was investigated using scanning electron microscopy (SEM). From the antibacterial activity test of nanocomposite, there is no toxic effect on the two biodegrading microorganisms. The remaining oil after biodegradation showed that immobilized bacterial consortium achieved the maximum degradation efficiency 93.32% after 3 days of incubation. Biodegradation of different polyaromatic hydrocarbons was also studied, and immobilized bacterial consortium showed good biodegradation capabilities compared to those of free and pure cells. The nanocomposite catalyst increases the microbiological reaction rates by stimulating the activity of microbes during the biodegradation process. With this excellent biodegradation efficiency, these results suggested that the immobilized BS1 and BS2 consortium entailed high potential treatment for industrial applications for the biodegradation of oil-contaminated soil.

MoZn /AlPO4-5 zeolite: Preparation, structural characterization and catalytic dehydration of ethanol

Journal of Solid State Chemistry, 2020

Abstract Aluminophosphate compounds (AlPO4-5) with the AFI structure framework are important memb... more Abstract Aluminophosphate compounds (AlPO4-5) with the AFI structure framework are important members of microporous zeolites group and molecular sieves materials because having an enormous variety of structures leading to high potential catalytic applications. AlPO4-5 molecular sieves have been prepared via the hydrothermal reaction by using triethylamine as a template. Molybdenum and zinc bimetal supported AlPO4-5 zeolite catalysts (MoZn/AlPO4-5) were prepared using a co-impregnation method with different molar ratios. The obtained samples were described by the physicochemical characterizations techniques. The bimetal ratios effect towards the dehydration of ethanol was investigated. MoZn(4)/AlPO4-5 exhibit the most active catalyst towards ethylene formation and the parent AlPO4-5 was the least active but with high selectivity towards diethyl ether production. This conversion convinced by ZnMoO4 phase formation during Mo and Zn oxides interactions leading to improving the acid sites which are a favorite environment and augment to ethylene formation.

Catalytic Carbon Monoxide Oxidation Over Copper/Silica Nanocatalysts

Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2012

In this work, the catalytic activity of copper/silica nanocatalysts (prepared by incipient wetnes... more In this work, the catalytic activity of copper/silica nanocatalysts (prepared by incipient wetness impregnation of the metal salt on nanosilica, thermally extracted from rice husk) on the oxidation of carbon monoxide is investigated. The effect of metal loading on the physico-chemical features of the prepared catalysts has been investigated by X-ray diffraction, differential thermal analysis, transmission electron microscopy, nitrogen adsorption-desorption

The Preparation and Characterization of Manganese Oxides/Rice Husk Silica Nanosized Catalysts for CO Oxidation

Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2012

Abstract In this work, nanosized manganese catalysts were prepared by incipient wetness impregnat... more Abstract In this work, nanosized manganese catalysts were prepared by incipient wetness impregnation of manganese salt on nanosilica. The nanosilica was thermally extracted from rice husk. The effect of metal oxide loading on the physico-chemical features and the catalytic activities of the catalysts towards the oxidation of carbon monoxide were investigated. Nanocatalyst loaded with 20.1 wt% manganese oxide (Mn20) was distinguished by the high surface area accompanied by the creation of new mesopores with respect to parent nanosilica. The X-ray diffraction and H2-temperature programmed reduction analyses indicated that the Mn5O8 phase was the predominant phase in Mn20 catalyst. The presence of the Mn5O8 phase, in addition to the high surface area of Mn20 catalyst, resulted in decreasing the conversion temperature of CO oxidation (T50), where the CO oxidation may follow the Mars-van-Krevelen route, i.e., redox mechanism.

Synthesis and Evaluation of Materials for High-Performance Supercapacitators

Interceram - International Ceramic Review, 2020

Thermodynamic parameter for steam reforming reaction of biodiesel by-product using nano-sized perovskite catalysts

The catalytic steam reforming of biodiesel by-product (glycerol) GSR for hydrogen production was ... more The catalytic steam reforming of biodiesel by-product (glycerol) GSR for hydrogen production was carried out using perovskite nano-catalysts (LaNiO3 and LaCoO3).The two catalysts were prepared by the reverse microemulsion method and characterized by XRD, by TG/DTA, BET and HRTEM. Equilibrium product compositions of GSR reaction were determined at different reaction temperature (400-700oC) with glycerol: water molar ratio 1: 10 in a fixed-bed flow system under atmospheric pressure. The equilibrium constant and thermodynamics parameters (ΔG, ΔH and ΔS) were calculated. The results revealed that, the conversion of the glycerol gradually increases with reaction temperature until reached 100% at temperature 700oC. LaNiO3 show higher gas product than LaCoO3 at the same reaction temperature. Moreover, H2 yield increased from 0.11 to 3.15 for LaNiO3 and 0.01 to 1.33 for LaCoO3. On the other hand, LaCoO3 provided more deactivation resistant along to 16h than LaNiO3. XRD analysis of spent cat...

Oxidative coupling of bio-alcohols mixture over hierarchically porous perovskite catalysts for sustainable acrolein production

The acrolein production from bio-alcohols methanol and ethanol mixtures using AMnO3 (since A = Ba... more The acrolein production from bio-alcohols methanol and ethanol mixtures using AMnO3 (since A = Ba and/or Sr) perovskite catalysts was studied. All the prepared samples were characterized by XRD, XPS, N2 sorption, FTIR, Raman spectroscopy, TEM, SEM, TGA, and NH3–CO2-TPD. The catalytic oxidation reaction to produce acrolein has occurred via two steps, the alcohols are firstly oxidized to corresponding aldehydes, and then the aldol is coupled with the produced aldehydes. The prepared perovskite samples were modified by doping A (Sr) position with (Ba) to improve the aldol condensation. The most catalytic performance was achieved using the BaSrMnO3 sample in which the acrolein selectivity reached 62% (T = 300 °C, MetOH/EtOH = 1, LHSV = 10 h−1). The increase in acrolein production may be related to the high tendency of BaSrMnO3 toward C–C coupling formation. The C–C tendency attributes to that modification have occurred in acid/base sites because of metal substitution.

Mercury removal from aqueous solution via functionalized mesoporous silica nanoparticles with the amine compound

Egyptian Journal of Petroleum, 2019

Studying the mercury removal from aqueous system using cubic mesoporous (Korea advanced institute... more Studying the mercury removal from aqueous system using cubic mesoporous (Korea advanced institute of science and technology, KIT-6) and ethylenediamine functionalized KIT-6 (DA-KIT-6) silica materials was examined. The prepared KIT-6 and DA-KIT-6 were identified by FTIR, low-angle X-ray diffraction, Raman spectroscopy, 29 Si NMR, BET, and HR-TEM. The removal of Hg 2+ by adsorption was studied by applying various conditions such as the initial concentration of mercury ions, silica or modified silica amounts, contact time, and pH. Parameter optimization showed that the rate of Hg 2+ adsorption of DA-KIT-6 is better than mesoporous KIT-6, which gave equilibrium adsorption rate of 95.9% and 82.5%, respectively, after 60 min at room temperature. The explanation of this behavior is due to the presence of ethylenediamine functionalized groups,-NH-(C 2 H 4)-NH 2, which have the ability to absorb Hg 2+ ions from the aqueous solution. The thermodynamic calculations showed that the values of DG 0 , DS 0 , and DH 0 were negative, which indicate that the adsorption of Hg 2+ on the prepared silicas materials is exothermic and more energetically favorable sorption. The negative value of DS 0 considers a decrease in the randomness at the sorbents-solution/interface during the Hg 2+ adsorption onto the pores of silica materials (KIT-6 and DA-KIT-6).

Catalytic Assessment of Nickel based Catalyst for Methane Synthesis from Syngas in a Fluidized Bed Reactor

International Journal of Theoretical and Applied Research

Hydrolysis of NaBH4 using ZVI/Fe2(MoO4)3 nanocatalyst

International Journal of Hydrogen Energy, 2018

In this work, the catalytic efficiency of zero valent iron (ZVI) impregnated on Fe 2 (MoO 4) 3 sp... more In this work, the catalytic efficiency of zero valent iron (ZVI) impregnated on Fe 2 (MoO 4) 3 spinal towards rapid hydrogen production from NaBH 4 have been studied. Experiments were carried out at 243e373 K using 5.29 mM aqueous solution. The catalytic activity was evaluated in comparing with the parent ferric molybdate. Although the parent ferric molybdate itself showed good synergistic catalytic activity, the impregnation of ZVI enhanced, obviously, the hydrolysis activities. The prepared catalysts were characterized by TEM, EDX, XRD, nitrogen adsorption-desorption at 77 K, and VSM. The reaction kinetics showed that the hydrolysis using ZVI catalyst followed zero order. A hydrogen generation rate of 1057 mL min À1 g À1 (Fe) at 373 K was achieved. Also, the activation energy of the reaction that calculated from the Arrhenius plot was 11.24 kJ mol À1 , which made it a noteworthy result as compared to other catalysts reported earlier.

Facile synthesis of ZnMoO4/AlPO4-5 nanorod composites as visible-light-driven photocatalysts and high-performance energy storage materials

RSC Advances

Photocatalytic degradation of PNP over single-crystalline ZnMoO4/AlPO4-5.

Visible-light Responsive Cu-MOF-NH 2 for Highly E cient Aerobic Photocatalytic Oxidation of Benzyl Alcohol

The current study focuses on the photocatalytic oxidation of benzyl alcohol in acetonitrile under... more The current study focuses on the photocatalytic oxidation of benzyl alcohol in acetonitrile under air bubbling conditions comparing titania-based materials, Cu-MOF, and Cu-MOF-NH2 as semiconductor photocatalysts. The catalysts were characterized by XRD, N2 adsorption-desorption, FT-IR, Raman spectroscopy, and TEM. The photocatalytic benzyl alcohol conversion reached ~ 100% after exposing the four prepared catalysts to a 125W mercury lamp for up to 240 min. Benzaldehyde is formed with a moderate selectivity (after a reaction time of 60 min. ca. 30% over the titaniabased catalysts 37%, 45% over Cu-MOF, and Cu-MOF-NH2, respectively). The formation of electron-hole pairs at the surface of the semiconductor nanoparticles followed by oxidation reaction was the suggested mechanism. A first-order kinetic model was observed for the photocatalytic oxidation of the investigated alcohols, and the rate constants were calculated. According to preliminary research, decorating MOF linker by amine (...

Preparation and Characterization of Conductive Polymer/Reduced Graphite Oxide (RGO) Composite via Miniemulsion Polymerization

Polymer/reduced graphite oxide (rGO) composite nanoparticles were prepared via miniemulsion polym... more Polymer/reduced graphite oxide (rGO) composite nanoparticles were prepared via miniemulsion polymerization. The rGO was modified with a reactive surfactant, 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS). The AMPS-modified rGO was emulsified in the presence of styrene (St) and Methyl meth acrylate (MMA) monomers, and the stable miniemulsion was polymerized to form poly (St-co-MMA)/rGO composite latex nanoparticles. The structure and morphology of the composite were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) and particle size distribution of prepared composite by zeta seizer (ZS). The electrical conductivity of the reduced graphene polymer composite has been measured to be approximatel 2.5 S cm -1 Keywords: Polymer/graphite composite, Miniemulsion, polymerization.

Preparation and Characterization of Conductive Polymer/Reduced Graphite Oxide (RGO) Composite via

Polymer/reduced graphite oxide (rGO) composite nanoparticles were prepared via miniemulsion polym... more Polymer/reduced graphite oxide (rGO) composite nanoparticles were prepared via miniemulsion polymerization. The rGO was modified with a reactive surfactant, 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS). The AMPS-modified rGO was emulsified in the presence of styrene (St) and Methyl meth acrylate (MMA) monomers, and the stable miniemulsion was polymerized to form poly (St-co-MMA)/rGO composite latex nanoparticles. The structure and morphology of the composite were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) and particle size distribution of prepared composite by zeta seizer (ZS). The electrical conductivity of the reduced graphene polymer composite has been measured to be approximatel 2.5 S cm-1

Synthesis of a perovskite LaNiO3 nanocatalyst at a low temperature using single reverse microemulsion

Catalysis Today, 2010

... D. Aman a , T. Zaki a , Corresponding Author Contact Information , E-mail The Corresponding A... more

Linker regulation of Cu/C@CoO derived from self-assembly of MOF to boost catalytic activity of organic contaminates

The reduction of harmful organic contaminants in agricultural wastewater to their corresponding a... more The reduction of harmful organic contaminants in agricultural wastewater to their corresponding amines is a key procedure in the fine chemical industry for pharmaceuticals, polymers, agrochemicals, and dyes. However, their effective and selective reduction reactions require compressed hydrogen at high temperatures and include noble metal catalysts, which are expensive and limited in supply. In this study, we present a novel approach using a layer-by-layer assembly of copper (Cu) metal-organic frameworks (MOFs) to prepare an earth-abundant, highly stable plasmonic nano-photocatalyst (that is, Cu nanoparticles (NPs)) over Co3O4 nanocubes (marked as CoO@Cu/C). The catalyst was produced by the thermal treatment of the prepared core-shell material, in which well-dispersed Cu NPs with the average size down of 5 nm high monodispersed were embedded in the carbon shell on the surface of CoO. This unique composition led to a significant enhancement in catalytic performance, yielding remarkabl...

Preparation and Characterization of Conductive Polymer/Reduced Graphite Oxide (RGO) Composite via Miniemulsion Polymerization

Chemical and Process Engineering Research, 2015

Polymer/reduced graphite oxide (rGO) composite nanoparticles were prepared via miniemulsion polym... more Polymer/reduced graphite oxide (rGO) composite nanoparticles were prepared via miniemulsion polymerization. The rGO was modified with a reactive surfactant, 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS). The AMPS-modified rGO was emulsified in the presence of styrene (St) and Methyl meth acrylate (MMA) monomers, and the stable miniemulsion was polymerized to form poly (St-coMMA)/rGO composite latex nanoparticles. The structure and morphology of the composite were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) and particle size distribution of prepared composite by zeta seizer (ZS). The electrical conductivity of the reduced graphene polymer composite has been measured to be approximatel 2.5 S cm-1

PLLA Nanosheets for Wound Healing: Embedding with Iron-Ion-Containing Nanoparticles

: This article reports on polymer (PLLA, poly(L-lactic acid)) nanosheets incorporated with Fe-ion... more : This article reports on polymer (PLLA, poly(L-lactic acid)) nanosheets incorporated with Fe-ion nanoparticles, aiming at using the latter nanoparticles as source to release Fe ions to facilitate burn wound healing when such nanosheets are applied on skin as biomedical tissue. Laser ablation in liquid phase was used to produce Fe-containing nanoparticles that after incorporation into PLLA nanosheets would release Fe ions when in immersed in water. Such nanoparticles prepared in chloroform are shown by XPS to be based on iron chloride and oxide phases. After incorporation into PLLA nanosheets, the ion –release test demonstrated that Fe ions could be released successfully into water at pH 7.4, which implies that such polymer nanosheets show promise for biomedical applications as potential patches for healing burn wounds. Incorporation with two different metal ions (Fe and Zn) is shown to be efficient and both types of ions were demonstrated to be released simultaneously and with comparable release rates.

Perovskite nanomaterials with exceptional photocatalytic properties for oxidative desulfurization of dibenzothiophene

Journal of Industrial and Engineering Chemistry

MOF-derived core–shell MnO@Cu/C as high-efficiency catalyst for reduction of nitroarenes

Chemical Engineering Journal

A Novel Bioremediation Technique for Petroleum Hydrocarbons by Bacterial Consortium Immobilized on Goethite-chitosan Nanocomposite

Soil and Sediment Contamination: An International Journal, 2021

ABSTRACT Environmental pollution by petroleum hydrocarbon is one of the significant concerns of t... more ABSTRACT Environmental pollution by petroleum hydrocarbon is one of the significant concerns of the contemporary world. This paper deals with the relevant environmental issues concerning the oil pollution of the petroleum industry. There is a need for further development of sustainable remediation technologies. Nineteen petroleum-degrading bacteria were isolated from an oil-polluted soil in the Suez oil processing company in Egypt. However, two bacterial species showed the highest growth rate of oil hydrocarbons. These isolates were identified by 16S rDNA gene sequence analysis into Flavobacterium johnsoniae BS1 (NCBI Gene Bank Accession no. MT740243) and Shewanella baltica BS2 (NCBI Gene Bank Accession no. MT740157). Ionic liquids prepared the goethite-chitosan nanocomposite assisted synthetic hydrothermal method. The antibacterial activity of synthesized nanocomposite on BS1and BS2 was determined. The two oil-degrading bacterial strains were immobilized onto the surface of the prepared nanocomposite. Pure and bacterial consortium studied the bioremediation process without/with nanocomposite. The remaining oil after bioremediation was extracted. Study results demonstrated that the affinity between the surface of bacterial cells and the prepared nanocomposite was investigated using scanning electron microscopy (SEM). From the antibacterial activity test of nanocomposite, there is no toxic effect on the two biodegrading microorganisms. The remaining oil after biodegradation showed that immobilized bacterial consortium achieved the maximum degradation efficiency 93.32% after 3 days of incubation. Biodegradation of different polyaromatic hydrocarbons was also studied, and immobilized bacterial consortium showed good biodegradation capabilities compared to those of free and pure cells. The nanocomposite catalyst increases the microbiological reaction rates by stimulating the activity of microbes during the biodegradation process. With this excellent biodegradation efficiency, these results suggested that the immobilized BS1 and BS2 consortium entailed high potential treatment for industrial applications for the biodegradation of oil-contaminated soil.

MoZn /AlPO4-5 zeolite: Preparation, structural characterization and catalytic dehydration of ethanol

Journal of Solid State Chemistry, 2020

Abstract Aluminophosphate compounds (AlPO4-5) with the AFI structure framework are important memb... more Abstract Aluminophosphate compounds (AlPO4-5) with the AFI structure framework are important members of microporous zeolites group and molecular sieves materials because having an enormous variety of structures leading to high potential catalytic applications. AlPO4-5 molecular sieves have been prepared via the hydrothermal reaction by using triethylamine as a template. Molybdenum and zinc bimetal supported AlPO4-5 zeolite catalysts (MoZn/AlPO4-5) were prepared using a co-impregnation method with different molar ratios. The obtained samples were described by the physicochemical characterizations techniques. The bimetal ratios effect towards the dehydration of ethanol was investigated. MoZn(4)/AlPO4-5 exhibit the most active catalyst towards ethylene formation and the parent AlPO4-5 was the least active but with high selectivity towards diethyl ether production. This conversion convinced by ZnMoO4 phase formation during Mo and Zn oxides interactions leading to improving the acid sites which are a favorite environment and augment to ethylene formation.

Catalytic Carbon Monoxide Oxidation Over Copper/Silica Nanocatalysts

Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2012

In this work, the catalytic activity of copper/silica nanocatalysts (prepared by incipient wetnes... more In this work, the catalytic activity of copper/silica nanocatalysts (prepared by incipient wetness impregnation of the metal salt on nanosilica, thermally extracted from rice husk) on the oxidation of carbon monoxide is investigated. The effect of metal loading on the physico-chemical features of the prepared catalysts has been investigated by X-ray diffraction, differential thermal analysis, transmission electron microscopy, nitrogen adsorption-desorption

The Preparation and Characterization of Manganese Oxides/Rice Husk Silica Nanosized Catalysts for CO Oxidation

Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2012

Abstract In this work, nanosized manganese catalysts were prepared by incipient wetness impregnat... more Abstract In this work, nanosized manganese catalysts were prepared by incipient wetness impregnation of manganese salt on nanosilica. The nanosilica was thermally extracted from rice husk. The effect of metal oxide loading on the physico-chemical features and the catalytic activities of the catalysts towards the oxidation of carbon monoxide were investigated. Nanocatalyst loaded with 20.1 wt% manganese oxide (Mn20) was distinguished by the high surface area accompanied by the creation of new mesopores with respect to parent nanosilica. The X-ray diffraction and H2-temperature programmed reduction analyses indicated that the Mn5O8 phase was the predominant phase in Mn20 catalyst. The presence of the Mn5O8 phase, in addition to the high surface area of Mn20 catalyst, resulted in decreasing the conversion temperature of CO oxidation (T50), where the CO oxidation may follow the Mars-van-Krevelen route, i.e., redox mechanism.

Synthesis and Evaluation of Materials for High-Performance Supercapacitators

Interceram - International Ceramic Review, 2020

Thermodynamic parameter for steam reforming reaction of biodiesel by-product using nano-sized perovskite catalysts

The catalytic steam reforming of biodiesel by-product (glycerol) GSR for hydrogen production was ... more The catalytic steam reforming of biodiesel by-product (glycerol) GSR for hydrogen production was carried out using perovskite nano-catalysts (LaNiO3 and LaCoO3).The two catalysts were prepared by the reverse microemulsion method and characterized by XRD, by TG/DTA, BET and HRTEM. Equilibrium product compositions of GSR reaction were determined at different reaction temperature (400-700oC) with glycerol: water molar ratio 1: 10 in a fixed-bed flow system under atmospheric pressure. The equilibrium constant and thermodynamics parameters (ΔG, ΔH and ΔS) were calculated. The results revealed that, the conversion of the glycerol gradually increases with reaction temperature until reached 100% at temperature 700oC. LaNiO3 show higher gas product than LaCoO3 at the same reaction temperature. Moreover, H2 yield increased from 0.11 to 3.15 for LaNiO3 and 0.01 to 1.33 for LaCoO3. On the other hand, LaCoO3 provided more deactivation resistant along to 16h than LaNiO3. XRD analysis of spent cat...

Oxidative coupling of bio-alcohols mixture over hierarchically porous perovskite catalysts for sustainable acrolein production

The acrolein production from bio-alcohols methanol and ethanol mixtures using AMnO3 (since A = Ba... more The acrolein production from bio-alcohols methanol and ethanol mixtures using AMnO3 (since A = Ba and/or Sr) perovskite catalysts was studied. All the prepared samples were characterized by XRD, XPS, N2 sorption, FTIR, Raman spectroscopy, TEM, SEM, TGA, and NH3–CO2-TPD. The catalytic oxidation reaction to produce acrolein has occurred via two steps, the alcohols are firstly oxidized to corresponding aldehydes, and then the aldol is coupled with the produced aldehydes. The prepared perovskite samples were modified by doping A (Sr) position with (Ba) to improve the aldol condensation. The most catalytic performance was achieved using the BaSrMnO3 sample in which the acrolein selectivity reached 62% (T = 300 °C, MetOH/EtOH = 1, LHSV = 10 h−1). The increase in acrolein production may be related to the high tendency of BaSrMnO3 toward C–C coupling formation. The C–C tendency attributes to that modification have occurred in acid/base sites because of metal substitution.

Mercury removal from aqueous solution via functionalized mesoporous silica nanoparticles with the amine compound

Egyptian Journal of Petroleum, 2019

Studying the mercury removal from aqueous system using cubic mesoporous (Korea advanced institute... more Studying the mercury removal from aqueous system using cubic mesoporous (Korea advanced institute of science and technology, KIT-6) and ethylenediamine functionalized KIT-6 (DA-KIT-6) silica materials was examined. The prepared KIT-6 and DA-KIT-6 were identified by FTIR, low-angle X-ray diffraction, Raman spectroscopy, 29 Si NMR, BET, and HR-TEM. The removal of Hg 2+ by adsorption was studied by applying various conditions such as the initial concentration of mercury ions, silica or modified silica amounts, contact time, and pH. Parameter optimization showed that the rate of Hg 2+ adsorption of DA-KIT-6 is better than mesoporous KIT-6, which gave equilibrium adsorption rate of 95.9% and 82.5%, respectively, after 60 min at room temperature. The explanation of this behavior is due to the presence of ethylenediamine functionalized groups,-NH-(C 2 H 4)-NH 2, which have the ability to absorb Hg 2+ ions from the aqueous solution. The thermodynamic calculations showed that the values of DG 0 , DS 0 , and DH 0 were negative, which indicate that the adsorption of Hg 2+ on the prepared silicas materials is exothermic and more energetically favorable sorption. The negative value of DS 0 considers a decrease in the randomness at the sorbents-solution/interface during the Hg 2+ adsorption onto the pores of silica materials (KIT-6 and DA-KIT-6).

Catalytic Assessment of Nickel based Catalyst for Methane Synthesis from Syngas in a Fluidized Bed Reactor

International Journal of Theoretical and Applied Research

Hydrolysis of NaBH4 using ZVI/Fe2(MoO4)3 nanocatalyst

International Journal of Hydrogen Energy, 2018

In this work, the catalytic efficiency of zero valent iron (ZVI) impregnated on Fe 2 (MoO 4) 3 sp... more In this work, the catalytic efficiency of zero valent iron (ZVI) impregnated on Fe 2 (MoO 4) 3 spinal towards rapid hydrogen production from NaBH 4 have been studied. Experiments were carried out at 243e373 K using 5.29 mM aqueous solution. The catalytic activity was evaluated in comparing with the parent ferric molybdate. Although the parent ferric molybdate itself showed good synergistic catalytic activity, the impregnation of ZVI enhanced, obviously, the hydrolysis activities. The prepared catalysts were characterized by TEM, EDX, XRD, nitrogen adsorption-desorption at 77 K, and VSM. The reaction kinetics showed that the hydrolysis using ZVI catalyst followed zero order. A hydrogen generation rate of 1057 mL min À1 g À1 (Fe) at 373 K was achieved. Also, the activation energy of the reaction that calculated from the Arrhenius plot was 11.24 kJ mol À1 , which made it a noteworthy result as compared to other catalysts reported earlier.

Facile synthesis of ZnMoO4/AlPO4-5 nanorod composites as visible-light-driven photocatalysts and high-performance energy storage materials

RSC Advances

Photocatalytic degradation of PNP over single-crystalline ZnMoO4/AlPO4-5.

Visible-light Responsive Cu-MOF-NH 2 for Highly E cient Aerobic Photocatalytic Oxidation of Benzyl Alcohol

The current study focuses on the photocatalytic oxidation of benzyl alcohol in acetonitrile under... more The current study focuses on the photocatalytic oxidation of benzyl alcohol in acetonitrile under air bubbling conditions comparing titania-based materials, Cu-MOF, and Cu-MOF-NH2 as semiconductor photocatalysts. The catalysts were characterized by XRD, N2 adsorption-desorption, FT-IR, Raman spectroscopy, and TEM. The photocatalytic benzyl alcohol conversion reached ~ 100% after exposing the four prepared catalysts to a 125W mercury lamp for up to 240 min. Benzaldehyde is formed with a moderate selectivity (after a reaction time of 60 min. ca. 30% over the titaniabased catalysts 37%, 45% over Cu-MOF, and Cu-MOF-NH2, respectively). The formation of electron-hole pairs at the surface of the semiconductor nanoparticles followed by oxidation reaction was the suggested mechanism. A first-order kinetic model was observed for the photocatalytic oxidation of the investigated alcohols, and the rate constants were calculated. According to preliminary research, decorating MOF linker by amine (...

Preparation and Characterization of Conductive Polymer/Reduced Graphite Oxide (RGO) Composite via Miniemulsion Polymerization

Polymer/reduced graphite oxide (rGO) composite nanoparticles were prepared via miniemulsion polym... more Polymer/reduced graphite oxide (rGO) composite nanoparticles were prepared via miniemulsion polymerization. The rGO was modified with a reactive surfactant, 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS). The AMPS-modified rGO was emulsified in the presence of styrene (St) and Methyl meth acrylate (MMA) monomers, and the stable miniemulsion was polymerized to form poly (St-co-MMA)/rGO composite latex nanoparticles. The structure and morphology of the composite were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) and particle size distribution of prepared composite by zeta seizer (ZS). The electrical conductivity of the reduced graphene polymer composite has been measured to be approximatel 2.5 S cm -1 Keywords: Polymer/graphite composite, Miniemulsion, polymerization.

Preparation and Characterization of Conductive Polymer/Reduced Graphite Oxide (RGO) Composite via

Polymer/reduced graphite oxide (rGO) composite nanoparticles were prepared via miniemulsion polym... more Polymer/reduced graphite oxide (rGO) composite nanoparticles were prepared via miniemulsion polymerization. The rGO was modified with a reactive surfactant, 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS). The AMPS-modified rGO was emulsified in the presence of styrene (St) and Methyl meth acrylate (MMA) monomers, and the stable miniemulsion was polymerized to form poly (St-co-MMA)/rGO composite latex nanoparticles. The structure and morphology of the composite were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) and particle size distribution of prepared composite by zeta seizer (ZS). The electrical conductivity of the reduced graphene polymer composite has been measured to be approximatel 2.5 S cm-1

Synthesis of a perovskite LaNiO3 nanocatalyst at a low temperature using single reverse microemulsion

Catalysis Today, 2010

... D. Aman a , T. Zaki a , Corresponding Author Contact Information , E-mail The Corresponding A... more