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Acetone Formation from Photolysis of 2-Propanol on Anatase-TiO2(101)
Zhen-hua Geng,Xiao Chen,Qing Guo,Dong-xu Dai,Xue-ming Yang
Author NameAffiliationE-mail
Zhen-hua Geng State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian 116023, China;University of Chinese Academy of Sciences, Beijing 100049, China  
Xiao Chen State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian 116023, China;University of Chinese Academy of Sciences, Beijing 100049, China  
Qing Guo State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian 116023, China guoqing@dicp.ac.cn 
Dong-xu Dai State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian 116023, China  
Xue-ming Yang State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian 116023, China xmyang@dicp.ac.cn 
Abstract:
Photocatalysis of 2-propanol on A-TiO2(101) has been investigated using a temperature programed desorption method with 266 nm laser light. A clear mechanism is proposed for photodissociation of 2-propanol on A-TiO2(101). Acetone product on five coordinate Ti4+ sites is formed in a stepwise manner in which the O-H dissociation proceeds first and then followed by secondary C-H dissociation of 2-propanol while H atoms are transferred to the adjacent bridge bond oxygen (BBO) sites. Low temperature water is formed in a thermally driven process via H-atom on BBO in exchange with isopropyl groups of molecule 2-propanol, while isopropyl radical desorbs at high temperature during the TPD process. The observation demonstrates the prospect of TiO2 as a photocatalyst for degradation of organics.
Key words:  2-Propanol  Photochemistry  A-TiO2(101)  Temperature-programmed desorption
FundProject:This work was supported by the Chinese Academy of Sciences,the National Natural Science Foundation of China (No.21403224),the Chinese Ministry of Science and Technology (No.2013CB834605),the Youth Innovation Promotion Association CAS,and the Key Research Program of the Chinese Academy of Sciences.
异丙醇在锐钛矿TiO2(101)表面的光化学
耿振华,陈晓,郭庆,戴东旭,杨学明
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DOI:10.1063/1674-0068/30/cjcp1608170
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