Summary Abstract: The hydrogenolysis of alkanes over single-crystalline surfaces of iridium: The influence of surface structure on the catalytic selectivity

Engstrom, J. R. and Goodman, D. W. and Weinberg, W. H. (1987) Summary Abstract: The hydrogenolysis of alkanes over single-crystalline surfaces of iridium: The influence of surface structure on the catalytic selectivity. Journal of Vacuum Science and Technology A, 5 (4). pp. 825-827. ISSN 0734-2101 http://resolver.caltech.edu/CaltechAUTHORS:ENGjvsta87b

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Abstract

We have investigated the hydrogenolysis of various short-chain alkanes on the Ir(111) and Ir(110)-(1×2) surfaces. A striking correlation has been discovered between the selectivity for ethane production from the hydrogenolysis of n-butane over Ir catalysts and the concentration of low-coordination-number metal surface atoms. This result is best interpreted as a manifestation of the occurrence of a particular adsorbed reaction intermediate on the Ir(11O)-(1×2) surface, namely, a metallacyc1e pentane. The formation of this intermediate is sterically forbidden on the Ir(111) surface.

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© 1987 American Vacuum Society. Received 13 October 1986; accepted 28 January 1987. This work was performed at Sandia National Laboratories and supported by the U.S. Department of Energy under Contract No. DE-AC04-76DP00789. We acknowledge the partial support of the Office of Basic Energy Sciences, Division of Chemical Science.

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Funding Agency	Grant Number
Department of Energy	DE-AC04-76DP00789

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