Simulation of Thermal Desorption from Nanometer Catalyst Particles

V. P. Zhdanov () and B. Kasemo
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V. P. Zhdanov: Department of Applied Physics, Chalmers University of Technology, S-412 96 Göteborg, Sweden;
B. Kasemo: Department of Applied Physics, Chalmers University of Technology, S-412 96 Göteborg, Sweden

Surface Review and Letters (SRL), 1998, vol. 05, issue 02, 551-558

Abstract: General equations are derived to describe monomolecular desorption from small supported catalyst particles in the cases where (i) the desorption process occurs simultaneously from different facets and (ii) adsorbed molecules are allowed to jump from the catalyst onto the support, diffuse on the support, and then desorb (a so-called spillover effect). Numerical calculations carried out on the basis of obtained equations indicate that the TPD spectra for interconnected facets might be qualitatively different from those for extended single crystals. The support-mediated channel has been shown to be important if the binding energy on the support is not too low.

Date: 1998
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DOI: 10.1142/S0218625X98000931

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