Vanadium phosphate (VPO) is well known as a heterogeneous catalyst in gas phase oxidation reactio... more Vanadium phosphate (VPO) is well known as a heterogeneous catalyst in gas phase oxidation reactions. Till date, this material has not drawn much attention for its application in liquid phase reactions. This paper briefly highlights our recent research on vanadyl metaphosphate concerning its fabrication, characterization and application towards liquid phase oxidation of benzyl alcohol to benzaldehyde using tert-butyl hydroperoxide (TBHP) as the oxidant. In our preliminary catalytic studies, we find that the VO(PO 3 ) 2 exhibits extraordinarily high activity and selectivity in oxidation of benzyl alcohol under mild conditions. The benzyl alcohol conversion is largely increased but the selectivity for benzaldehyde is slightly decreased with the increase in reaction period or temperature. The present catalyst VO(PO 3 ) 2 showed remarkable catalytic activity with respect to other catalytic system; conversion and selectivity with respect to aldehyde is 97 and 99%, respectively.
This paper reports the facile synthesis of vanadium phosphate (VPO) by the decomposition of VO-HP... more This paper reports the facile synthesis of vanadium phosphate (VPO) by the decomposition of VO-HPO 4 Á0.5H 2 O which was prepared by reduction of dihydrate VOPO 4 Á2H 2 O with isobutanol. The material was promoted with aluminum by impregnation method. The catalysts were unambiguously characterized by N 2 adsorption-desorption, XRD, FT-IR techniques, UV-Vis DRS and the total amount of the acidity of the catalysts was estimated by NH 3 -TPD. The catalytic activities were checked in the heterogeneous catalytic esterification of acetic acid with 1°alcohol (n-butanol) in a solvent free medium. The optimization of reaction was carried out by varying temperature from 75 to 150°C, molar ratio (butanol:acetic acid) from 1:1 to 1:4. Under optimum conditions, the catalytic esterification runs revealed a significant effect of the VPO giving 62% conversion with 100% selectivity to butyl acetate.
Abstract This paper reports the facile synthesis of vanadium phosphate (VPO) by the decomposition... more Abstract This paper reports the facile synthesis of vanadium phosphate (VPO) by the decomposition of VOHPO4·0.5H2O which was prepared by reduction of dihydrate VOPO4·2H2O with isobutanol. The material was promoted with aluminum by impregnation method. The catalysts were unambiguously characterized by N2 adsorption–desorption, XRD, FT-IR techniques, UV–Vis DRS and the total amount of the acidity of the catalysts was estimated by NH3-TPD. The catalytic activities were checked in the heterogeneous catalytic esterification of acetic acid with 1° alcohol (n-butanol) in a solvent free medium. The optimization of reaction was carried out by varying temperature from 75 to 150 °C, molar ratio (butanol:acetic acid) from 1:1 to 1:4. Under optimum conditions, the catalytic esterification runs revealed a significant effect of the VPO giving 62% conversion with 100% selectivity to butyl acetate. Graphical Abstract Vanadium Phosphate is prepared in aqueous medium by taking vanadium pentoxide, o-phosphoric acid and isobutanol. The catalyst is found to be robust enough to achieve high degree of esterification under solvent free condition.
Vanadium phosphate (VPO) is well known as a heterogeneous catalyst in gas phase oxidation reactio... more Vanadium phosphate (VPO) is well known as a heterogeneous catalyst in gas phase oxidation reactions. Till date, this material has not drawn much attention for its application in liquid phase reactions. This paper briefly highlights our recent research on vanadyl metaphosphate concerning its fabrication, characterization and application towards liquid phase oxidation of benzyl alcohol to benzaldehyde using tert-butyl hydroperoxide (TBHP) as the oxidant. In our preliminary catalytic studies, we find that the VO(PO 3 ) 2 exhibits extraordinarily high activity and selectivity in oxidation of benzyl alcohol under mild conditions. The benzyl alcohol conversion is largely increased but the selectivity for benzaldehyde is slightly decreased with the increase in reaction period or temperature. The present catalyst VO(PO 3 ) 2 showed remarkable catalytic activity with respect to other catalytic system; conversion and selectivity with respect to aldehyde is 97 and 99%, respectively.
This paper reports the facile synthesis of vanadium phosphate (VPO) by the decomposition of VO-HP... more This paper reports the facile synthesis of vanadium phosphate (VPO) by the decomposition of VO-HPO 4 Á0.5H 2 O which was prepared by reduction of dihydrate VOPO 4 Á2H 2 O with isobutanol. The material was promoted with aluminum by impregnation method. The catalysts were unambiguously characterized by N 2 adsorption-desorption, XRD, FT-IR techniques, UV-Vis DRS and the total amount of the acidity of the catalysts was estimated by NH 3 -TPD. The catalytic activities were checked in the heterogeneous catalytic esterification of acetic acid with 1°alcohol (n-butanol) in a solvent free medium. The optimization of reaction was carried out by varying temperature from 75 to 150°C, molar ratio (butanol:acetic acid) from 1:1 to 1:4. Under optimum conditions, the catalytic esterification runs revealed a significant effect of the VPO giving 62% conversion with 100% selectivity to butyl acetate.
Abstract This paper reports the facile synthesis of vanadium phosphate (VPO) by the decomposition... more Abstract This paper reports the facile synthesis of vanadium phosphate (VPO) by the decomposition of VOHPO4·0.5H2O which was prepared by reduction of dihydrate VOPO4·2H2O with isobutanol. The material was promoted with aluminum by impregnation method. The catalysts were unambiguously characterized by N2 adsorption–desorption, XRD, FT-IR techniques, UV–Vis DRS and the total amount of the acidity of the catalysts was estimated by NH3-TPD. The catalytic activities were checked in the heterogeneous catalytic esterification of acetic acid with 1° alcohol (n-butanol) in a solvent free medium. The optimization of reaction was carried out by varying temperature from 75 to 150 °C, molar ratio (butanol:acetic acid) from 1:1 to 1:4. Under optimum conditions, the catalytic esterification runs revealed a significant effect of the VPO giving 62% conversion with 100% selectivity to butyl acetate. Graphical Abstract Vanadium Phosphate is prepared in aqueous medium by taking vanadium pentoxide, o-phosphoric acid and isobutanol. The catalyst is found to be robust enough to achieve high degree of esterification under solvent free condition.
Uploads
Papers by Gobinda Behera