Influence of the support in aqueous phase oxidation of ethanol on gold/metal oxide catalysts studied by ATR-IR spectroscopy under working conditions

Ammara Waheed; Xianwei Wang; Nobutaka Maeda; Daniel.M. Meier; Tamao Ishida; Toru Murayama; Masatake Haruta; Alfons Baiker

Catalysis Communications (Jan 2021)

Influence of the support in aqueous phase oxidation of ethanol on gold/metal oxide catalysts studied by ATR-IR spectroscopy under working conditions

Ammara Waheed,
Xianwei Wang,
Nobutaka Maeda,
Daniel.M. Meier,
Tamao Ishida,
Toru Murayama,
Masatake Haruta,
Alfons Baiker

Affiliations

Ammara Waheed: Gold Catalysis Research Center, State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, People's Republic of China; University of Chinese Academy of Sciences, Beijing 100049, China
Xianwei Wang: Key Laboratory of Industrial Ecology and Environmental Engineering, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, People's Republic of China
Nobutaka Maeda: Institute of Materials and Process Engineering (IMPE), Zurich University of Applied Sciences (ZHAW), Technikumstrasse 9, CH-8400 Winterthur, Switzerland; Corresponding authors.
Daniel.M. Meier: Institute of Materials and Process Engineering (IMPE), Zurich University of Applied Sciences (ZHAW), Technikumstrasse 9, CH-8400 Winterthur, Switzerland
Tamao Ishida: Department of Applied Chemistry for Environment, Research Center for Gold Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan; Corresponding authors.
Toru Murayama: Department of Applied Chemistry for Environment, Research Center for Gold Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
Masatake Haruta: Department of Applied Chemistry for Environment, Research Center for Gold Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
Alfons Baiker: Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, Hönggerberg, HCI, CH-8093 Zurich, Switzerland; Corresponding authors.

Journal volume & issue: Vol. 148
p. 106183

Abstract

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Effects of supports (Co3O4, CeO2, NiO) in the gold-catalyzed aqueous phase oxidation of ethanol (EtOH) to acetic acid (AcOH) were examined. ATR-IR spectroscopy under working conditions of the catalysts uncovered on gold particles bidentate ethoxy, and on supports monodentate ethoxy species, multi-layered ethanol, and acetate. Preferential formation of bidentate ethoxy species and adsorbed EtOH were identified as key factors for high activity and selectivity to AcOH. These requirements were best matched with Au/Co3O4. On NiO, monodentate ethoxy species on the support deteriorated the catalytic performance due to consecutive esterification of AcOH and/or acetate species with EtOH producing undesirable ethyl acetate.

Published in Catalysis Communications

ISSN: 1566-7367 (Print); 1873-3905 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Science: Chemistry
Website: https://www.journals.elsevier.com/catalysis-communications

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