Abstract
The reaction path of the CO oxidation over polycrystalline palladium and rhodium was studied by a transient isotope tracer method. An isotopic composition of CO 2 produced transiently was monitored by mass spectrometry where the surface covered by given amounts of 13CO and 12CO was exposed to a gas mixture of 12CO and O 2. The initial ratio of 13CO 2 to 12CO 2 in carbon dioxide produced was equal to that of 13CO to 12CO in carbon monoxide preadsorbed for all conditions studied. Carbon monoxide immediately prior to the oxidation was concluded to be in a chemisorption state, i.e., carbon dioxide is produced through the interaction between a CO admolecule and an oxygen ad-atom (a Langmuir-Hinshelwood process). No contribution from an Eley-Rideal process, namely, CO(phys. ad) + O(ad) → CO 2, was observed.
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