Journal
APPLIED CATALYSIS A-GENERAL
Volume 202, Issue 2, Pages 197-205Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0926-860X(00)00526-3
Keywords
chemisorption; carbon monoxide; spill over; hydrogenation; platinum; ZrO2
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The adsorption of CO (10% CO/He) on pure ZrO2 aerogel and on a 0.5% Pt/ZrO2 solid is studied at 638 K using in situ FTIR. It is shown that the two solids lead to the formation of the same adsorbed species: formate and carbonate species, in comparable superficial concentration. On ZrO2, the formate species are not hydrogenated in presence of pure hydrogen at 544 K. On Pt/ZrO2, they are hydrogenated at 544 K into adsorbed methoxy groups by hydrogen spilled over species. The methoxy groups are hydrogenated into methane by a process which probably involves a reverse spillover. (C) 2000 Elsevier Science B.V. All rights reserved.
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