Modelling of the elementary surface processes occurring in the course of heterogeneous catalytic reactions
A short review of theoretical results on the Langmuir-Hinschelwood and Eley-Rideal reaction schemes is presented. It is shown that the rates of elementary processes at the surface are coupled through the bulk properties of adsorbing species. This concerns the dependence of the chemical potential o...
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| Date: | 2000 |
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| Main Authors: | , |
| Format: | Article |
| Language: | English |
| Published: |
Інститут фізики конденсованих систем НАН України
2000
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| Series: | Condensed Matter Physics |
| Online Access: | http://dspace.nbuv.gov.ua/handle/123456789/121032 |
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| Journal Title: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Cite this: | Modelling of the elementary surface processes occurring in the course of heterogeneous catalytic reactions / M.F. Holovko, E.V. Vakarin // Condensed Matter Physics. — 2000. — Т. 3, № 2(22). — С. 417-436. — Бібліогр.: 27 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| Summary: | A short review of theoretical results on the Langmuir-Hinschelwood and
Eley-Rideal reaction schemes is presented. It is shown that the rates of elementary processes at the surface are coupled through the bulk properties
of adsorbing species. This concerns the dependence of the chemical potential on the association-dissociation balance and on the adsorbate density near the surface. Adsorption is shown to be sensitive to a mechanism
of dimer adsorption (associative or dissociative). Dissociative adsorption
gives a nonmonotonic behaviour of the coverage with the surface activity.
Simultaneously, the dissociation degree increases with increasing adsorption. The associative adsorption implies the existence of a low-density critical point around which the adsorption isotherms are discontinuous. This
causes an abnormal low surface diffusion at low densities. Implementation
of these results to kinetic properties are briefly discussed. |
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