Interaction of CO with Rh supported on stoichiometric and reduced CeO{sub 2}(111) and CeO{sub 2}(100) surfaces

Journal Article · Fri Mar 01 04:00:00 EST 1996 · Journal of Catalysis

DOI:https://doi.org/10.1006/jcat.1996.0063· OSTI ID:263770

Stubenrauch, J; Vohs, J M ^[1]

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1. Univ. of Pennsylvania, Philadelphia, PA (United States)

The structure and reactivity of Rh films supported on the surface of a CeO{sub 2} single crystal were studied using Auger electron spectroscopy (AES) and temperature-programmed desorption (TPD). Rhodium films deposited from the vapor phase were found to grow via the nucleation of three-dimensional particles at a sample temperature of 300 K. Annealing of the Rh films resulted in further agglomeration of the metal layer. Carbon monoxide TPD spectra obtained from Rh supported on oxygen-annealed CeO{sub 2}(111) and CeO{sub 2}(100) substrates were similar to those obtained from the low-index planes of Rh single crystals, with the exception that a small fraction of the CO (ca. 2%) was oxidized to CO{sub 2}. In contrast, a new high-temperature CO desorption state was observed in the TPD spectra obtained from Rh supported on partially reduced CeO{sub 2} surfaces. 25 refs., 9 figs.

• OSTI ID: 263770
• Journal Information: Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 1 Vol. 159; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
40 CHEMISTRY
AGGLOMERATION
ANNEALING
AUGER ELECTRON SPECTROSCOPY
CARBON MONOXIDE
CATALYST SUPPORTS
CERIUM OXIDES
DESORPTION
FILMS
MILLER INDICES
OXIDATION
RHODIUM
SORPTIVE PROPERTIES
STOICHIOMETRY
TEMPERATURE DEPENDENCE