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Photocatalytic Dissociation of CH3OH on ZnO(0001) Surface
Peng-xiao Liang1, Fei Xu1, Zhen-xing Li1, Zhi-wen Luan1, Xing-an Wang*1, Qing Guo*2,3, Xue-ming Yang*2,3
1.Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China;2.State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;3.Department of Chemistry, School of Science, Southern University of Science and Technology, Shenzhen 518055, China
Abstract:
Photocatalysis of CH3OH on the ZnO(0001) surface has been investigated by using temperature-programmed desorption (TPD) method with a 266 nm laser light. TPD results show that part of the CH3OH adsorbed on ZnO(0001) surface are in molecular form, while others are dissociated. The thermal reaction products of H2, CH3·, H2O, CO, CH2O, CO2 and CH3OH have been detected. Experiments with the UV laser light indicate that the irradiation can promote the dissociation of CH3OH/CH3O· to form CH2O, which can be future converted to HCOO- during heating or illumination. The reaction between CH3OHZn and OHad can form the H2O molecule at the Zn site. Both temperature and illumination promote the desorption of CH3· from CH3O·. The research provides a new insight into the photocatalytic reaction mechanism of CH3OH on ZnO(0001).
Key words:  Methanol, Photocatalysis, ZnO(0001) surface, Temperature-programmed desorption
FundProject:
CH3OH在ZnO(0001)表面的光催化解离
梁朋晓1, 徐 飞1, 李振兴1, 栾志文1, 王兴安*1, 郭 庆*2,3, 杨学明*2,3
1.中国科学技术大学化学物理系,合肥 230026;2.中国科学院大连化学物理研究所,分子反应动力学国家重点实验室,大连 116023;3.南方科技大学理学院化学系,深圳 518055
摘要:
本文利用266 nm波长的激光及程序升温脱附的方法研究了甲醇在ZnO(0001)表面的光催化反应. TPD结果显示部分的CH3OH以分子的形式吸附在ZnO(0001)表面,而另外一部分在表面发生了解离. 实验过程中探测到H2,CH3·,H2O,CO,CH2O,CO2和CH3OH这些热反应产物. 紫外激光照射实验结果表明光照可以促进CH3OH/CH3O·解离形成CH2O,在程序升温或光照的过程中它又可以转变为HCOO-. CH2OHZn与OHad反应在Zn位点上形成H2O分子. 升温或光照都能促进CH3O·转变为CH3·. 该研究对CH3OH在ZnO(0001)表面的光催化反应机理提供了一个新的见解.
关键词:  甲醇,光催化,ZnO(0001)表面,程序升温脱附
DOI:10.1063/1674-0068/cjcp1905088
分类号: