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Title: The Interaction of Carbon Monoxide with Rhodium on Potassium-Modified CeO 2(111)

The adsorption and reactions of CO adsorbed on Rh particles deposited on K-covered CeO 2(111) were studied by temperature programmed desorption and photoelectron spectroscopy. K deposited on CeO 2(111) forms a KO X over-layer by extracting O from the ceria and partially reducing some of the Ce 4+ to Ce 3+. CO does not adsorb on the KO X / CeO 2-X(111) surface in the absence of Rh particles. CO adsorbed on Rh / K / CeO 2(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 CO 2. 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 CeO 2(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 carbonatemore » decomposes into gas phase CO and CO 2.« less
Authors:
 [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Surface Science
Additional Journal Information:
Journal Volume: 652; Journal ID: ISSN 0039-6028
Publisher:
Elsevier
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
OSTI Identifier:
1324072
Alternate Identifier(s):
OSTI ID: 1359908

Mullins, David R. The Interaction of Carbon Monoxide with Rhodium on Potassium-Modified CeO2(111). United States: N. p., Web. doi:10.1016/j.susc.2016.01.024.
Mullins, David R. The Interaction of Carbon Monoxide with Rhodium on Potassium-Modified CeO2(111). United States. doi:10.1016/j.susc.2016.01.024.
Mullins, David R. 2016. "The Interaction of Carbon Monoxide with Rhodium on Potassium-Modified CeO2(111)". United States. doi:10.1016/j.susc.2016.01.024. https://www.osti.gov/servlets/purl/1324072.
@article{osti_1324072,
title = {The Interaction of Carbon Monoxide with Rhodium on Potassium-Modified CeO2(111)},
author = {Mullins, David R.},
abstractNote = {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 KOX over-layer by extracting O from the ceria and partially reducing some of the Ce4+ to Ce3+. CO does not adsorb on the KOX / CeO2-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 KOX 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 CO2- at 200 K. The CO2- decomposes below 350 K to produce gas phase CO and adsorbed CO32- 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.},
doi = {10.1016/j.susc.2016.01.024},
journal = {Surface Science},
number = ,
volume = 652,
place = {United States},
year = {2016},
month = {2}
}