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Abrupt increase in hydrogen diffusion on transition-metal surfaces during hydrogenation catalysis.

Abstract

A sharp increase in the rate of hydrogen isotope scrambling was identified during the hydrogenation of olefins with H2 + D2 mixtures on Pt(111) catalysts, which spectroscopic data suggest is due to a sudden increase in atomic hydrogen surface mobility because of a decrease in the size of the islands of the adsorbed hydrocarbons.

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