Photo Stimulated Surface Catalytic Syntheses of Methanol and Hydrogen from Methane and Water over MoO3-TiO2/SiO2

Abstract

Abstract: TiO₂/SiO₂ were prepared by the chemical modification reaction on SiO₂,and MoO₃-TiO₂/SiO₂ were prepared by isovolumetric impregnation of TiO₂/SiO₂. Based on the characterization of XRD,BET,TPR,UVDRS,IR and TPD,the surface species of supported n-p coupled semiconductors（MoO₃-TiO₂/SiO₂） are well-dispersed,which have the quantum size effects and make the photo absorption threshold blue-shifting. The experiments also confirmed that the incorporation of TiO₂ can not only enhance the interaction between MoO₃ and supports but also improve photo absorption property. In addition,the reactants CH₄ and H₂O can be adsorbed and activated effectively. The gas-phase photocatalytic production of CH₃OH and H₂ from CH₄ and H₂O was performed in the presence of MoO₃-TiO₂/SiO₂ at 100 ℃ by using a fixed-bed annular photoreactor under UV irradiation,with a selectivity of CH₃OH being 85.6%. The “photo-surface-thermal” synergistic action can be formed at the reaction temperature,which accelerated the photocatalytic reaction. And the reaction mechanism was proposed.

Key words: MoO3-TiO₂/SiO₂, Methane, Methanol, Photo-catalysis

CLC Number:

O643

TrendMD:

SANG Li-Xia, ZHONG Shun-He, XIAO Xiu-Fen, WANG Xi-Tao, TAN Jian-Hua, ZHOU Zhi-Quan. Photo Stimulated Surface Catalytic Syntheses of Methanol and Hydrogen from Methane and Water over MoO₃-TiO₂/SiO₂[J]. Chem. J. Chinese Universities, 2004, 25(6): 1115.

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Photo Stimulated Surface Catalytic Syntheses of Methanol and Hydrogen from Methane and Water over MoO₃-TiO₂/SiO₂

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