Photoinduced decomposition of acetaldehyde on a reduced TiO2(110) surface: involvement of lattice oxygen

被引：16
作者：
Xu, Chenbiao [1 ]
Yang, Wenshao [1 ]
Guo, Qing [1 ]
Dai, Dongxu [1 ]
Yang, Xueming [1 ]
机构：
[1] Dalian Inst Chem Phys, Chinese Acad Sci, State Key Lab Mol React Dynam, 457 Zhongshan Rd, Dalian 116023, Liaoning, Peoples R China
来源：
PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2016年 / 18卷 / 45期
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
FORMIC-ACID; PHOTOCATALYTIC OXIDATION; ACETONE PHOTOCHEMISTRY; TIO2; PHOTOCATALYSIS; CH3; EJECTION; ETHANOL; PHOTOOXIDATION; ADSORPTION; CHEMISTRY; MECHANISM;
D O I：
10.1039/c6cp04397f
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
We have investigated the photo-induced decomposition of acetaldehyde (CH3CHO) on TiO2(110) at 400 nm using temperature programmed desorption (TPD) and time of flight (TOF) methods. Formate (HCOO-) and acetate (CH3COO-) products have been detected. The initial step in the decomposition of CH3CHO on TiO2(110) is the formation of a CH3CHO bidentate intermediate in which the carbonyl O atom of CH3CHO is bound to the five-fold-coordinated Ti4+ lattice site (Ti-5c) and the carbonyl C atom is bound to a nearby bridge-bonded oxygen (BBO) atom. During 400 nm irradiation, the decomposition of the CH3CHO bidentate mainly occurs through two parallel pathways. Part of the CH3CHO bidentate on the surface undergoes a facile photoreaction to form formate by ejecting the methyl radical of CH3CHO into gas phase. The remaining CH3CHO bidentate reacts on the surface to produce acetate by transferring the H atom of -CHO to a BBO site or by ejecting the H atom into the vacuum. Thus we have found that BBO atoms are intimately involved in the photo-induced decomposition of CH3CHO on TiO2(110).
引用
收藏
页码：30982 / 30989
页数：8
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