酸化チタン/ZSM-5ゼオライト光触媒によるアセトアルデヒドの完全酸化分解反応

概要

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TiO2 hybridized with ZSM-5 zeolites were prepared by the impregnation of (NH4)2[TiO(C2O4)2] aqueous solution. This is one of the most ideal green processes in establishing TiO2 photocatalysts because of an organic solvent-free preparation method. The highly hydrophobic H-ZSM-5 having low Al2O3 content was effective as an adsorbent for acetaldehyde. On the other hand, acetaldehyde molecules were strongly trapped on the Na+ sites of ZSM-5 and their efficient diffusion onto the TiO2 sites was inhibited. These results suggest the close relationship between the interaction of reactant with zeolite surfaces and the photocatalytic reactivity of TiO2 prepared on the zeolites as compared to unloaded TiO2 catalysts. The photocatalytic oxidation of acetaldehyde on TiO2/ZSM-5 was improved in the presence of H2O vapor.