Papers by Imroatul Qoniah
Mesoporous alumina has been successfully synthesized from bauxite residues (red mud) as raw mater... more Mesoporous alumina has been successfully synthesized from bauxite residues (red mud) as raw material and cetyltrimethylammonium bromide (CTAB) as template at room temperature. The effects of crystallization time and molar ratio of H2O/CTAB on structural and textural properties of mesoporous alumina were investigated. The synthesized product was characterized by XRD, FTIR, SEM-EDX, TEM, N2 adsorption-desorption and acidity test using pyridine adsorption. The XRD pattern and SEM micrograph showed that the synthesized product possessed an amorphous phase and irregular shapes. From obtained results, it could be observed that crystallization time and H2O/CTAB ratio influenced the surface acidity of mesoporous alumina.
Journal of the Chinese Chemical Society, 2020
Zeolite is extensively synthesized for the application in a large variety of catalysis processes ... more Zeolite is extensively synthesized for the application in a large variety of catalysis processes such as ion exchange, hydrocarbon cracking, and organic synthesis. In order to satisfy the serious terms of sustainability that denotes to the reduction of costs and chemical waste, kaolinite-based zeolites were produced from cheap natural resources as against to the conventional process that employs pure sodium silicate and sodium aluminate. This review paper is to highlight the current trends in the synthesis of zeolite. Prior to previous reviews, great concern is focused on the impurities effect on the catalytic performance of kaolinite-based zeolites. This study reveals that the impact of impurities in a catalytic reaction was in fact, underestimated or neglected. For instance, it was found that Fe ion concentration as small as 60 ppm gives significant catalytic output. Hence, a new practice to report the concentration of impurities in the research publication is suggested. This undoubtedly will generate a better interpretation of the catalytic activity from the zeolite framework
Materials Science Forum, 2020
Hierarchical ZSM-5 was successfully synthesized by hydrothermal crystallization of kaolin clay. A... more Hierarchical ZSM-5 was successfully synthesized by hydrothermal crystallization of kaolin clay. A statistical experimental design Taguchi method with analysis of variance (ANOVA) with an L9 Orthogonal array (OA) was used to optimize the formation of high mesoporosity in hierarchical ZSM-5. Samples from kaolin mixtures crystallized at 80-175°C for 12, 24 and 48 h, respectively using hydrothermal followed by addition of mesoporogen cetyltrimethylammonium bromide (CTABr) surfactant. The presence of pentasil zeolite groups and large mesopores surface area and pore volume has observed on the samples by FTIR and N2 adsorption-desorption technique.The optimum synthesis conditions studied by Taguchi analysis based on S/N ratio for temperature and time of hydrothermal. The optimum condition was 127.5°C and 48 h giving the highest mesoporosity. Data analysis of interaction plot for S/N ratio showed there was interaction between temperature and time in the crystallization of hierarchical ZSM-5...
Bulletin of Chemical Reaction Engineering & Catalysis, 2019
Indonesian kaolin was used as precursor for synthesis of sodalite. Synthesis parameters were opti... more Indonesian kaolin was used as precursor for synthesis of sodalite. Synthesis parameters were optimized by varying the Si/Al ratios, stirring and aging conditions, and water composition. X-ray diffraction (XRD), Fourier Transform Infra Red (FTIR), Scanning Electron Microscope-Energy Dispersive X-ray (SEM-EDX), and Particle Size Analyzer (PSA) were used to characterize sodalite. The potential of sodalite as adsorbent for heavy metal Pb2+ ions removal from waste water was investigated in this work. The uptake adsorption capacities of sodalite was 90-100 mg/g from synthesized sodalite crystallized for 24 and 48 hours, and commercial silica. The kinetic of Pb2+ adsorption was a pseudo second order reaction and the adsorption coefficients was followed Langmuir adsorption isotherm. Copyright © 2019 BCREC Group. All rights reserved
Indonesian Journal of Chemistry, 2019
Hierarchical micro-mesoporous aluminosilicates nanoparticles were synthesized at different of Si/... more Hierarchical micro-mesoporous aluminosilicates nanoparticles were synthesized at different of Si/Al ratios and were directly used as a solid acid catalyst for acetalization reaction with propylene glycol. TEM and N2 adsorption analysis of the resulting aluminosilicates revealed the formation of the hierarchical structure occurs on the Si/Al ratio increases the formation of mesoporous within the structure of aluminosilicate. The aluminosilicates exhibit high selectivity towards acetalization reaction in comparison with the homogeneous PTSA. The presence of mesoporous structures is crucial for increased conversion and selectivity of the reaction which presumably due to the improved diffusion of substrate to reach acid sites.
Malaysian Journal of Fundamental and Applied Sciences, 2019
Mesoporous alumina has been successfully synthesized from bauxite residues (red mud) as raw mater... more Mesoporous alumina has been successfully synthesized from bauxite residues (red mud) as raw material and cetyltrimethylammonium bromide (CTAB) as template at room temperature. The effects of crystallization time and molar ratio of H2O/CTAB on structural and textural properties of mesoporous alumina were investigated. The synthesized product was characterized by XRD, FTIR, SEM-EDX, TEM, N2 adsorption-desorption and acidity test using pyridine adsorption. The XRD pattern and SEM micrograph showed that the synthesized product possessed an amorphous phase and irregular shapes. From obtained results, it could be observed that crystallization time and H2O/CTAB ratio influenced the surface acidity of mesoporous alumina.
Malaysian Journal of Fundamental and Applied Sciences, 2017
We investigated the transformation of kaolin to ZSM-5 using hydrothermal synthesis method and the... more We investigated the transformation of kaolin to ZSM-5 using hydrothermal synthesis method and the influence of organic template as a structure-directing agent. The formation of ZSM-5 from kaolin occurred via dissolution of kaolin to form amorphous silica. Zeolite-like analcime produced when the hydrothermal treatment was extended to 18 h. We found synergistic effect of using a mixture of TPAOH and TPABr organic template to enhance kaolin dissolution, initiate ZSM-5 formation and inhibit the transformation of ZSM-5 to analcime.
Indonesian Journal of Chemistry, 2016
CaO catalysts were synthesized from limestone by thermal decomposition and coprecipitation method... more CaO catalysts were synthesized from limestone by thermal decomposition and coprecipitation methods. The CaO and MgO reference catalysts were also synthesized for comparison. The catalysts were characterized by X-ray diffractometer (XRD) and the analysis result was refined by Rietica software. CaO catalyst obtained by coprecipitation method has higher purity of CaO and lower MgO content than those of calcined CaO. The catalysts were also characterized by Fourier Transform Infrared (FTIR) spectroscopy. FTIR spectra showed that the catalysts can be easily hydrated and carbonated in air. The catalytic activity of the catalyst was studied in transesterification reaction of Reutealis trisperma (Kemiri Sunan) oil with methanol. Transesterification reaction was carried out at oil to methanol molar ratio 1:1 and 1% of catalyst at 60 °C for 2 h. Catalytic activity of CaO catalyst obtained by coprecipitation was higher than calcined CaO. The methyl ester yield obtained from synthesized CaO, Ca...
Indonesian Journal of Chemistry, 2016
Biodiesel production from waste palm oil catalyzed by hierarchical ZSM-5 supported calcium oxide ... more Biodiesel production from waste palm oil catalyzed by hierarchical ZSM-5 supported calcium oxide was studied. The activity of CaO increased after supported on h-ZSM-5 resulting an increase in conversion from 93.17% to 95.40%. A maximum conversion of 95.40% was achieved at 6 h reaction time, 3 wt.% catalyst amount, 12:1 methanol to oil molar ratio and 65 °C reaction temperature. The waste palm oil showed a high potential as a feedstock in biodiesel production in which there was no significant different in the conversion of fresh and waste palm oil. The properties of the obtained biodiesel required the limits of biodiesel specification according to ASTM D6751-08 and EN 14214 with the methyl ester content of 97.18%, the acid value of 0.24 mg KOH/g, the kinematic viscosity of 4.64 cSt and the density of 869.9 kg/m3.
Indonesian Journal of Chemistry, 2015
Aluminium chloride immobilized on mesoporous aluminosilicate was investigated as catalysts in the... more Aluminium chloride immobilized on mesoporous aluminosilicate was investigated as catalysts in the condensation of isatin with indole. AlCl3/mesoporous aluminosilicate (AlCl3/AM) catalysts were prepared by impregnation of 1, 5, 10 and 15 wt% AlCl3 on the surface of mesoporous aluminosilicate. A maximum conversion of isatin was achieved using 15% AlCl3/AM catalyst whereas the highest selectivity of 68.97% towards trisindoline was obtained using pure AM. The activity of the catalysts was depended on their acid site number and surface area. The number of Brønsted acid and the surface area affected to the conversion of isatin while the total acidity and the number of Lewis acid influenced the selectivity.
REAKTOR, 2016
AMMOXIMATION OF CYCLOHEXANONE OVER Mo-IMPREGNATED TITANIUM SILICALITE USING HYDROGEN PEROXIDE AS ... more AMMOXIMATION OF CYCLOHEXANONE OVER Mo-IMPREGNATED TITANIUM SILICALITE USING HYDROGEN PEROXIDE AS AN OXIDANT. Ammoximation of cyclohexanone reaction using 1%MoO 3 /TS-1 catalyst have been made with hydrogen peroxide as an oxidant. Reaction carried out with the batch method using methanol and acetonitrile as solvent. Reaction products analyzed using gas chromatography. The 1%MoO 3 /TS-1 catalyst shows the highest activity than the TS-1. The increased of 1% MoO 3 /TS-1 catalytic activity due to hydrophilicity properties higher than TS-1. Reaction using methanol shows the highest activity compared with reactions using acetonitrile. The optimum calcination temperature for 1%MoO 3 /TS-1 catalyst to gives the highest activity is 400 ºC.
PENGGUNAAN CANGKANG BEKICOT …, 2011
... dilakukan pada atau diatas suhu 700??C karena CaCO3 akan terdekomposisi menjadi CaO pada atau... more ... dilakukan pada atau diatas suhu 700??C karena CaCO3 akan terdekomposisi menjadi CaO pada atau diatas suhu tersebut (Viriya dkk, 2010; Boey dkk, 2009). ... Reaksi yang terjadi adalah : Ca(CH3COO)2.H2O(aq) + H2C2O4.2H2O(aq) ??? CaC2O4 (s) + 2CH3COOH(aq) + 3H2O(l ...
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Papers by Imroatul Qoniah