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：

中国博士后科学基金; 中国国家自然科学基金;

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

页码：30982 / 30989

页数：8

共 46 条

[31] Dark- and photoreactions of ethanol and acetaldehyde over TiO2/carbon molecular sieve fibers [J].