Preparation of H5PMo10V2O40 (PMo10V2) catalyst immobilized on nitrogen-containing mesoporous carbon (N-MC) and its application to the methacrolein oxidation

Abstract

Abstract Nitrogen-containing mesoporous carbon (N-MC) with high surface area (=938 m 2 /g) and large pore volume (0.99 cm 3 /g) was synthesized by a templating method using SBA-15 and polypyrrole as a templating agent and a carbon precursor, respectively. The N-MC was then modified to have a positive charge, and thus, to provide sites for the immobilization of the H 5 PMo 10 V 2 O 40 (PMo 10 V 2 ) catalyst. By taking advantage of the overall negative charge of [PMo 10 V 2 O 40 ] 5− , the PMo 10 V 2 catalyst was immobilized on the N-MC support as a charge matching component. The prepared PMo 10 V 2 /N-MC catalyst was applied to the vapor-phase oxidation of methacrolein (a model surface-type reaction). It was found that the [PMo 10 V 2 O 40 ] 5− species were finely and chemically immobilized on the N-MC support as charge matching species. In the vapor-phase oxidation of methacrolein, the PMo 10 V 2 /N-MC catalyst showed a higher conversion of methacrolein and a higher yield for methacrylic acid than the unsupported PMo 10 V 2 catalyst. Furthermore, the PMo 10 V 2 /N-MC catalyst also showed a higher conversion of methacrolein and a higher yield for methacrylic acid than the PMo 10 V 2 /SBA-15 catalyst prepared by an impregnation method. The enhanced catalytic performance of PMo 10 V 2 /N-MC in the model surface-type reaction was due to the fine dispersion of PMo 10 V 2 species formed via chemical immobilization.