Controlled Vacancy-Assisted C鈥揅 Couplings of Acetaldehyde on Rutile TiO2(110)

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• 作者：Wenshao Yang ; Zhenhua Geng ; Chenbiao Xu ; Qing Guo ; Dongxu Dai ; Xueming Yang
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：December 4, 2014
• 年：2014
• 卷：118
• 期：48
• 页码：27920-27924
• 全文大小：281K
• ISSN：1932-7455

文摘

Reductive C鈥揅 coupling of acetaldehyde (CH₃CHO) on rutile TiO₂(110) surface with controlled oxygen vacancy coverage was investigated by temperature-programmed desorption (TPD). Two main reaction products, 2-butanone and butene, have been detected. Experimental results suggest that the two products are produced via two distinctive vacancy-assisted C鈥揅 couplings on the surface. The 2-butanone product is produced via the reductive C鈥揅 coupling of CH₃CHO on reduced rutile TiO₂(110) in which one CH₃CHO molecule adsorbed on the five coordinated Ti site (Ti_5c) and the other on a nearby bridge-bonded oxygen (BBO) vacancy site; while butene is produced from the self-coupling of two CH₃CHO molecules adsorbed on two adjacent BBO vacancy sites. The results of this work indicate that surface vacancy plays a key role in the C鈥揅 coupling reactions of CH₃CHO.