A Fourier-transform infrared study of CO2 and CO2/H2 interactions with caesium-doped copper catalysts |
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Authors: | Graeme J. Millar Colin H. Rochester Kenneth C. Waugh |
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Affiliation: | (1) Department of Chemistry, University of Dundee, DD1 4HN Dundee, UK;(2) Department of Chemistry, UMIST, PO Box 88, M60 1QD Manchester, UK;(3) Present address: Department of Chemistry, University of Queensland, 4072 Brisbane, Queensland, Australia |
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Abstract: | FTIR spectra are reported of CO2 and CO2/H2 on a silica-supported caesium-doped copper catalyst. Adsorption of CO2 on a “caesium”/silica surface resulted in the formation of CO2 − and complexed CO species. Exposure of CO2 to a caesium-doped reduced copper catalyst produced not only these species but also two forms of adsorbed carboxylate giving bands at 1550, 1510, 1365 and 1345 cm−1. Reaction of carboxylate species with hydrogen at 388 K gave formate species on copper and caesium oxide in addition to methoxy groups associated with caesium oxide. Methoxy species were not detected on undoped copper catalyst suggesting that caesium may be a promoter for the methanol synthesis reaction. Methanol decomposition on a caesium-doped copper catalyst produced a small number of formate species on copper and caesium oxide. Methoxy groups on caesium oxide decomposed to CO and H2, and subsequent reaction between CO and adsorbed oxygen resulted in carboxylate formation. Methoxy species located at interfacial sites appeared to exhibit unusual adsorption properties. |
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Keywords: | copper catalysts, modified with caesium copper catalysts, CO2/H2 adsorption |
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