The Interaction of Carbon Monoxide with Rhodium on Potassium-Modified CeO2(111)

Mullins, David R.

doi:10.1016/j.susc.2016.01.024

Title: The Interaction of Carbon Monoxide with Rhodium on Potassium-Modified CeO₂(111)

Journal Article · Wed Feb 03 00:00:00 EST 2016 · Surface Science

DOI:https://doi.org/10.1016/j.susc.2016.01.024· OSTI ID:1324072

Mullins, David R. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

The adsorption and reactions of CO adsorbed on Rh particles deposited on K-covered CeO₂(111) were studied by temperature programmed desorption and photoelectron spectroscopy. K deposited on CeO₂(111) forms a KO_X over-layer by extracting O from the ceria and partially reducing some of the Ce⁴⁺ to Ce³⁺. CO does not adsorb on the KO_X / CeO_2-X(111) surface in the absence of Rh particles. CO adsorbed on Rh / K / CeO₂(111) adsorbs molecularly on the Rh at 200 K. As the surface is heated the CO spills-over and reacts with the KOX to form carbonate. The carbonate decomposes at elevated temperature to produce CO and CO₂. The carbonate stabilizes the KO_X so that K desorbs at a higher temperature than it would in the absence of CO. When the Rh and K deposition are reversed so that K is deposited on both the Rh and the CeO²(111), CO adsorbs as CO^2- at 200 K. The CO^2- decomposes below 350 K to produce gas phase CO and adsorbed CO3^2- and CO. The CO is stabilized by the K on the Rh and desorbs above 540 K. The carbonate decomposes into gas phase CO and CO₂.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; DEAC02-98CH10886

OSTI ID:: 1324072

Alternate ID(s):: OSTI ID: 1359908

Journal Information:: Surface Science, Vol. 652; ISSN 0039-6028

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 1 work

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