Detection of activated adsorption sites and a CO-H surface complex on Ru/Al sub 2 O sub 3

Journal Article · Sat Oct 01 00:00:00 EDT 1988 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(88)90270-9· OSTI ID:6580162

Sen, B; Falconer, J L ^[1]

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1. Univ. of Colorado, Boulder (USA)

Temperature-programmed reaction and desorption (TPR, TPD), in combination with isotope labeling of CO, identified the existence of two distinct reaction sites for CO hydrogenation on Ru/Al{sub 2}O{sub 3} catalysts. These sites are similar to those previously reported on Ni/Al{sub 2}O{sub 3} catalysts. Carbon monoxide adsorbs on Ru crystallites at 300 K; at higher temperatures, in an activated process that requires H{sub 2}, CO transfers to the Al{sub 2}O{sub 3} to form a CO-H complex, with the stoichiometry of a methoxy species. This transfer process is significantly slower than that on Ni/Al{sub 2}O{sub 3}. The decomposition of the CO-H complex limits the rate of CH{sub 4} formation for the second peak seen in TPR. The first peak is due to hydrogenation of the CO absorbed on Ru. The similarities to Ni/Al{sub 2}O{sub 3} catalysts imply that an aluminate is not required for multiple reaction sites on Ni/Al{sub 2}O{sub 3}.

• OSTI ID: 6580162
• Journal Information: Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 113:2; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

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