Abstract
Infrared spectroscopy has been employed to study the reduction of carbon dioxide on supported catalyst films. The investigation included isotopic labeling using D/sub 2/ as the reduction gas. Isotopic exchange was observed for both CO/sub 2//D/sub 2/ and CH/sub 4//D/sub 2/ mixtures. The mechanism of this isotopic exchange involves migration of hydrogen from the support to the Rh sites, an ''inverse spillover effect''. A key intermediate in the dissociation of CO/sub 2/ on the supported Rh films was a carbonyl hydride species. 21 refs., 2 figs.
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