Preparation, characterization, and oxidation catalysis of H_3PMo_(12)O_(40) heteropolyacid catalyst immobilized on carbon aerogel

摘要

Carbon aerogel (CA) with high surface area and large pore volume was prepared by polycondensation of resorcinol with formaldehyde. The surface of CA was then modified to have a positive charge, and thus to provide a site for the immobilization of H_3PMo_(12)O_(40)(PMo_(12)) catalyst. By taking advantage of the overall negative charge of [PMo_(12)O_(40)]~(3-), PMo_(12) catalyst was chemically immobilized on the surface-modified CA as a charge matching component. It was found that PMO_(12) catalyst was finely dispersed on the CA support via chemical interaction. In the vapor-phase 2-propanol conversion reaction, the PMo_(12)/CA catalyst showed a higher 2-propanol conversion than the unsupported PMo_(12) catalyst. Furthermore, the PMo_(12)/CA catalyst showed an enhanced oxidation catalytic activity (formation of acetone) and a suppressed acid catalytic activity (formation of propylene and isopropyl ether) compared to the unsupported PMo_(12) catalyst. The enhanced oxidation activity of PMo_(12)/CA catalyst was due to fine dispersion of [PMo_(12)O_(40)]~(3-) on the CA support formed via chemical immobilization.