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Kinetics of Photogenerated Electrons Involved in Photocatalytic Reaction of Methanol on Pt/TiO2
Tao Chen, Guo-peng Wu, Zhao-chi Feng, Jian-ying Shi, Gui-jun Ma, Pin-liang Ying, Can Li*
State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
Abstract:
Time-resolved IR spectroscopy was used to detect the photocatalytic reaction of methanol for H2 production on Pt/TiO2 catalysts. There exists an optimal amount of Pt loading in the Pt/TiO2 catalysts for the reaction of the photogenerated long-lived electrons. For a given amount of Pt loading, the reaction rate of the long-lived electrons on Pt/TiO2 catalysts varies greatly with the di?erent reduction temperature of the catalysts. The possible reason is that the Pt particles occupy the surface active sites for methanol adsorption on Pt/TiO2 catalysts reduced at high temperature. This phenomenon is not observed obviously on Pt/TiO2 catalysts reduced at low temperature. The decay rate of the long-lived electrons evaluated by time-resolved IR method qualitatively correlates well with the activity of H2 production under steady-state irradiation conditions.
Key words:  Methanol photocatalytic reaction, Time-resolved IR, Pt/TiO2 photocatalyst, Photogenerated electron, Decay kinetic
FundProject:国家自然科学基金
时间分辨红外光谱研究Pt/TiO2上甲醇光催化反应中光生电子衰减动力学
陈涛, 吴国鹏, 冯兆池, 石建英, 马贵军, 应品良, 李灿*
中国科学院大连化学物理研究所催化基础国家重点实验室,大连116023
摘要:
采用时间分辨红外光谱直接观测了甲醇在Pt/TiO2上光催化反应制氢过程中光生电子还原氢离子生成氢气的反应过程.结果表明Pt的担载量存在一最佳值,使得该催化剂中光生电子的反应速度最快.当Pt担载量相同时,Pt/TiO2催化剂中光生电子参与产氢反应的速度随样品还原温度的不同而明显变化.可能的原因是较高温度下氢气还原的Pt/TiO2催化剂中Pt粒子占据了TiO2表面的一些能够解离吸附甲醇的活性位置,而对于较低温度下氢气还原的Pt/TiO2催化剂,这种占据作用很不明显.实验中还发现瞬态动力学研究中光生电子衰减较快
关键词:  甲醇光催化反应,时间分辨红外,Pt/TiO2,光生电子,衰减动力学
DOI:10.1088/1674-0068/20/04/483-488
分类号: