Preparation, characterization, and catalytic activity of H_3PW_(12)O_(40) heteropolyacid catalyst supported on mesoporous γ-Al_2O_3

摘要

A mesoporous γ-Al_2O_3 with randomly ordered pore structure was successfully synthesized by a post hydrolysis method. H_3PW_(12)O_(40) catalyst supported on γ-Al_2O_3 was prepared by an impregnation method for use as a catalyst in the vapor-phase 2-propanol conversion. It was observed that the pore structure of γ-Al_2O_3 was maintained even after the supporting of H_3PW_(12)O_(40) catalyst. It was also revealed that H_3PW_(12)O_(40) species were finely dispersed on the γ-Al_2O_3 support via strong interaction. In the catalytic reaction, the supported H_3PW_(12)O_(40)/γ-Al_2O_3 catalyst exhibited higher 2-propanol conversion than the bulk H_3PW_(12)O_(40) catalyst. Furthermore, the H_3PW_(12)O_(40)/γ-Al_2O_3 catalyst showed the enhanced oxidation activity for acetone production compared to the mother catalyst. It is concluded that high dispersion of H_3PW_(12)O_(40) catalyst on the γ-Al_2O_3 support via strong interaction was much more efficient in enhancing the oxidation catalytic activity of the H_3PW_(12)O_(40)/γ-Al_2O_3 catalyst.