Comparing and contrasting CO oxidation by Rh atoms and clusters on and under thin-film copper oxides

April 1, 2026Journal of CatalysisOpen Access

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Key Points

The study aims to compare CO oxidation mechanisms and efficiencies of Rh atoms and clusters on different copper oxide supports.
Compared CO oxidation on Rh under thin oxide films on RhCu(1 1 1) and Cu(1 1 1) surfaces.
Used temperature-programmed desorption and isotopic labeling to analyze CO 2 production.
Applied density functional theory to model and understand reaction pathways.
Rh under CuO x yielded CO 2 with 100% conversion but suppressed C-O bond cleavage.
Distinct CO 2 desorption peaks indicate different oxidation behaviors for Rh under and on the oxide.
Density functional theory showed the oxidation pathway for Rh under oxide is more active with clusters than isolated atoms.

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Comparison reveals distinct CO oxidation behaviors of Rh on and under copper oxides, highlighting mechanistic differences.

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Çınar et al. (2026) studied this question.

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