Acetaldehyde partial oxidation on the Au (111) model catalyst surface: C-C bond activation and formation of methyl acetate as an oxidative coupling product

Date
2015
Authors
Karatok, M.
Vovk, E. I.
Shah, A. A.
Turksoy, A.
Ozensoy, E.
Advisor
Supervisor
Co-Advisor
Co-Supervisor
Instructor
Source Title
Surface Science
Print ISSN
0039-6028
Electronic ISSN
Publisher
Elsevier
Volume
641
Issue
Pages
289 - 293
Language
English
Type
Article
Journal Title
Journal ISSN
Volume Title
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Abstract

Partial oxidation of acetaldehyde (CH3CHO) on the oxygen pre-covered Au(111) single crystal model catalyst was investigated via Temperature Programmed Desorption (TPD) and Temperature Programmed Reaction Spectroscopy (TPRS) techniques, where ozone (O3) was utilized as the oxygen delivery agent providing atomic oxygen to the reacting surface. We show that for low exposures of O3 and small surface oxygen coverages, two partial oxidation products namely, methyl acetate (CH3COOCH3) and acetic acid (CH3COOH) can be generated without the formation of significant quantities of carbon dioxide. The formation of methyl acetate as the oxidative coupling reaction product implies that oxygen pre-covered Au(111) single crystal model catalyst surface can activate C-C bonds. In addition to the generation of these products; indications of the polymerization of acetaldehyde on the gold surface were also observed as an additional reaction route competing with the partial and total oxidation pathways. The interplay between the partial oxidation, total oxidation and polymerization pathways reveals the complex catalytic chemistry associated with the interaction between the acetaldehyde and atomic oxygen on catalytic gold surfaces.

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Book Title
Keywords
Acetaldehyde, Au(111), Methyl acetate, Oxidative coupling, Partial oxidation
Citation
Published Version (Please cite this version)