Abstract
Surface of mesostructured cellular foam (MCF) silica was modified by grafting 3-aminopropyl-triethoxysilane (APTES) to have the positive charge, and thus, to provide sites for the immobilization of H 3PMo 12O 40. By taking advantage of the overall negative charge of [PMo 12O 40] 3−, H 3PMo 12O 40 catalyst was chemically immobilized on the aminopropyl group of surface modified MCF (SM-MCF) silica as a charge matching component. It was revealed that H 3PMo 12O 40 species were finely and molecularly dispersed on the SM-MCF silica via chemical immobilization. In the vapor-phase ethanol conversion reaction, the H 3PMo 12O 40/SM-MCF silica catalyst showed a higher ethanol conversion than the bulk H 3PMo 12O 40 catalyst. Furthermore, the H 3PMo 12O 40/SM-MCF silica catalyst exhibited an enhanced oxidation catalytic activity (formation of acetaldehyde) and a suppressed acid catalytic activity (formation of ethylene and diethylether) compared to the mother catalyst. The enhanced ethanol conversion and oxidation catalytic activity of H 3PMo 12O 40/SM-MCF silica catalyst was attributed to fine dispersion of H 3PMo 12O 40 species on the SM-MCF silica via chemical immobilization.
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