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MoO3-TiO2/SiO2上光促表面催化甲烷和水合成甲醇和氢气
引用本文:桑丽霞,钟顺和,肖秀芬,王希涛,谭建华,周智泉.MoO3-TiO2/SiO2上光促表面催化甲烷和水合成甲醇和氢气[J].高等学校化学学报,2004,25(6):1115-1119.
作者姓名:桑丽霞  钟顺和  肖秀芬  王希涛  谭建华  周智泉
作者单位:天津大学化工学院,天津,300072
基金项目:国家重大基础研究前期研究专项基金(批准号: 2001CCAO-3600)资助.
摘    要:用分步等体积浸渍法制备了负载型复合半导体催化剂MoO3-TiO2/SiO2,通过XRD,BET,TPR,IR,UVDRS和TPD等手段对其进行了表征,结果表明,活性组分在载体表面高度分散,并具有量子尺寸效应,吸光阈值显著蓝移;TiO2在SiO2表面分散可增强MoO3与载体的相互作用,调变吸光性能,所形成的表面活性基元能够有效地吸附活化甲烷和水.在100℃下利用固定床环隙反应器借助紫外光的激发,通过“光-表面-热”协同作用,气相甲烷和水在MoO3-TiO2/SiO2表面生成了甲醇和氢,选择性达到85.6%.

关 键 词:MoO3-TiO2/SiO2  甲烷  甲醇  光催化
文章编号:0251-0790(2004)06-1115-05
收稿时间:2003-05-20

Photo Stimulated Surface Catalytic Syntheses of Methanol and Hydrogen from Methane and Water over MoO3-TiO2/SiO2
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].Chemical Research In Chinese Universities,2004,25(6):1115-1119.
Authors:SANG Li-Xia  ZHONG Shun-He  XIAO Xiu-Fen  WANG Xi-Tao  TAN Jian-Hua  ZHOU Zhi-Quan
Institution:College of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
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.
Keywords:MoO_3-TiO_2/SiO_2  Methane  Methanol  Photo-catalysis
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