J. Phys.: Condens. Matter 21 (25 November 2009) 474223 (7pp) doi: 10.1088/0953-8984/21/47/474223
Characterization of active sites on
Rh/SiO2
model catalysts
Sean M McClure, M Lundwall, F Yang, Z Zhou and D W Goodman1
Department of Chemistry, Texas A&M University, PO Box 30012, College Station, TX
77842-3012,
USA
1 Author to whom any correspondence should be addressed
E-mail: goodman@mail.chem.tamu.eduAbstract.
Rh/SiO2
model catalyst surfaces are prepared under ultra-high vacuum conditions and examined in
situ using scanning tunneling microscope and CO infrared reflection absorption techniques,
to quantify the number and kinds of active Rh surface sites available for kinetic
reaction (CO oxidation) as a function of Rh particle size. The results are compared
against CO desorption measurements and elevated pressure CO oxidation reaction
kinetics, to evaluate the extent of the correlation between the low and elevated
pressure site characterization techniques. Data demonstrate that estimates of Rh
active sites exhibit good agreement between the characterization methods and
illustrate the utility of low pressure surface science characterization techniques in
understanding elevated pressure reaction kinetics on model catalyst surfaces.
Print publication: Issue 47 (25 November 2009)Received 19 May 2009
Published 5 November 2009
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