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Growth of Ce on Rh, Surface Alloy Formation and the Preparation and Properties of Rh/Ceria Model Planar Catalysts

Elsevier BV North-Holland
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Ce deposition on Rh has been studied over a range of conditions: at sufficiently high temperatures a stable surface alloy (Ce3Rh2) is formed at all Ce coverages. Oxidation and thermal treatment of Ce overlayers leads to agglomeration and the formation of cerium oxide crystallites on an essentially bare Rh surface. The chemisorption and reactive behaviour of this latter system towards carbon monoxide very closely mimics that of practical CeO2/Rh catalysts: CO2 is efficiently produced by oxygen spillover from the rare-earth oxide phase.

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