Reversal of the SMSI on Pt/TiO sub 2 by CO hydrogenation

Journal Article · Fri Mar 01 04:00:00 EST 1991 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(91)90076-G· OSTI ID:5517207

Blankenburg, K J; Datye, A K ^[1]

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1. Univ. of New Mexico, Albuquerque (USA)

The authors have examined the role of the SMSI state in the CO hydrogenation activity of Pt/TiO{sub 2} and, in particular, whether CO hydrogenation leads to reversal of the SMSI state. Hydrogenolysis of n-butane, which is suppressed in the SMSI state, was used to monitor the onset and reversal of the SMSI state. When CO hydrogenation was performed on a Pt/TiO{sub 2} catalyst subjected to high temperature reduction, there was almost a complete restoration of hydrogenolysis activity. This implies that the working catalyst surface during CO hydrogenation is free of the site-blocking oxide species responsible for the SMSI state. The ratio of hydrogenolysis/isomerization activity of n-butane was also unaffected by onset of the SMSI state. Therefore, the migration of TiO{sub x} over the metal surface during SMSI does not cause selective suppression of hydrogenolysis with respect to isomerization. The site-blocking oxide species responsible for SMSI on the metal surface do not appear to be necessary to obtain enhanced CO hydrogenation activity on Pt/TiO{sub 2}.

• OSTI ID: 5517207
• Journal Information: Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 128:1; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

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