NDLI: CO Oxidation Studied Using ‘Fast’ XPS and a Molecular Beam Reactor

Content Provider	Springer Nature Link
Author	Bennett, Roger A. Jones, Isabel Z. Bowker, Michael
Copyright Year	2007
Abstract	We have combined the use of a molecular beam reactor with ‘fast’ XPS in order to correlate changes in the rate of CO oxidation with the coverages of the adsorbates and intermediates on the surface. In the reactor CO oxidation exhibits an isothermal ‘light-off’ phenomenon in which the rate autocatalytically increases with time. This is due to the desorption of CO which releases extra sites for O$_{2}$ dissociation which, in turn, removes more CO, and hence the self-acceleration. In effect the reaction can be written as 2CO$_{a}$ + O$_{2g}$ + 2S → 2CO$_{2g}$ + 4S, the acceleration coming from the release of extra adsorption sites, S, which are involved in the reaction itself. ‘Fast XPS’, carried out in-situ during the course of the reaction, shows domination of the surface by CO$_{a}$ below 390 K and by O$_{a}$ above that temperature, with a rapid change in surface coverage over a very narrow temperature window. This is an advance on earlier work, since our measurements are made in a single, continuous experiment, due to the high brightness of the synchrotron source. This also allows the data to be obtained at high energy resolution, in the presence of both gases, and without contamination. On high surface area samples this acceleration is further reinforced due to a rapid temperature increase because of the highly exothermic nature of the overall reaction.
Starting Page	373
Ending Page	376
Page Count	4
File Format	PDF
ISSN	10225528
Journal	Topics in Catalysis
Volume Number	42
Issue Number	1-4
e-ISSN	15729028
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2007-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	CO oxidation ‘light-off’ Langmuir-Hinshelwood Pd(110) XPS of catalysis Catalysis Physical Chemistry Pharmacy Industrial Chemistry/Chemical Engineering Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis

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