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学科主题物理化学
Multi-scaling study of adsorption and desorption of methanol on TiO2(110) surface
Sun KJ(孙科举); Li WX(李微雪)
会议名称239th American Chemical Society National Meeting & Exposition
会议日期2010-3-21
2010-03-21
会议地点美国
其他题名甲醇在TiO2(110)面上吸附及脱附的多尺度研究
页码144-TECH/2
部门归属五室
主办者American Chemical Societry
英文摘要Adsorption and desorption of methanol on TiO2 was studied extensively theoretically and experimentally because of its potential application in photo-catalysis. However, the structures at wide range of the coverage from submonolayer to saturate adsorption as well as its stability at different temperatures and pressures, which is crucial to understand the reaction mechanism under realistic conditions, was remained. In this talk, we present a multi-scaling study of methanol adsorption and desorption on TiO2(110) surface by so-called ab initio thermodynamics and kinetic Monte Carlo (kMC) study. The thermodynamics analysis based on the density functional theory calculations shows that the methanol adsorption at coverage of 2/3 ML is prevailed at wide range of temperatures and pressures, and a full monolayer methanol is stable only at very limited T/P windows. The temperature programmed desorption (TPD) spectroscopy are simulated using kMC, and the agreement with experiment [M. A. Henderson et al Faraday Discuss., 1999, 114, 313] was excellent. A detailed microscopic picture of adsorption and desorption of methanol on TiO2(110) was mapped out for the first time. We found that the full monolayer adsorption methanol desorbs at about 150 K and the methanol dimer at coverage of 2/3 ML is stable up to 250 K. With increase of temperature further, the methanol dimer becomes unstable and decompose to the monomer, which desorbs from the surface at 350 K.
语种中文
文献类型会议论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/114022
专题中国科学院大连化学物理研究所
通讯作者Li WX(李微雪)
推荐引用方式
GB/T 7714
Sun KJ,Li WX. Multi-scaling study of adsorption and desorption of methanol on TiO2(110) surface[C],2010:144-TECH/2.
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