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题名: Effect of Multilayer Methanol and Water in Methanol Photochemistry on TiO2
作者: Yang, Wenshao1;  Geng, Zhenhua2;  Guo, Qing2;  Dai, Dongxu2;  Yang, Xueming1, 2
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
发表日期: 2017-08-17
DOI: 10.1021/acsjpcc.7b04224
卷: 121, 期:32, 页:17244-17250
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: We have conducted a series of temperature programmed desorption (TPD) experiments to study the photoinduced reactions of methanol (CH3OH) on a rutile(R)TiO2(110) surface with 355 nm light. Products formaldehyde (CH2O) and water (H2O) have been detected. The results clearly show that the photochemistry of CH3OHTisc is hindered by the coadsorbed multilayer CH3OH or H2O. For multilayer CH3OH adsorption, CH3OH molecules hydrogen-bonded to the bridge bonded oxygen sites inhibit the CH3OHTisc photochemistry. Combined with previous theoretical studies (Sci. China Chem. 2015, 58, 614-619), CH3OH molecules hydrogen bonded to the BBO sites increase the energy barrier of C-H bond dissociation and decrease the energy barrier of the reverse reaction, resulting in lowering the efficiency of CH3OHTisc photolysis. As the coverage of CH3OH keeps increasing to multilayer, the efficiency of the CH3OHTisc photolysis does not decrease any more. However, with the coadsorbed H2O molecules, the efficiency of CH3OHTi5c photolysis decreases continually with increasing H2O coverage, which is likely due to the decrease of the, chemisorbed CH3OHTisc molecules via molecule exchange between the H2O films and the chemisorbed CH3OH layer that occurs at similar to 100 K and the complicated hydrogen bonds formed between H2O and CH3OHTisc molecules.
关键词[WOS]: RUTILE TIO2(110) ;  METHYL FORMATE ;  DISSOCIATION ;  SURFACES ;  ADSORPTION ;  PHOTOCATALYSIS ;  FORMALDEHYDE ;  PRINCIPLES ;  BOND
语种: 英语
WOS记录号: WOS:000408179500025
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/149897
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Zhejiang Normal Univ, Hangzhou Inst Adv Studies, 1108 Gengwen Rd, Hangzhou 311231, Zhejiang, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, 457 Zhongshan Rd, Dalian 116023, Liaoning, Peoples R China

Recommended Citation:
Yang, Wenshao,Geng, Zhenhua,Guo, Qing,et al. Effect of Multilayer Methanol and Water in Methanol Photochemistry on TiO2[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2017,121(32):17244-17250.
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