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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| Дата: | 2000 |
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| Автори: | , |
| Формат: | Стаття |
| Мова: | English |
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Інститут фізики конденсованих систем НАН України
2000
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| Назва видання: | Condensed Matter Physics |
| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/121032 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | 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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irk-123456789-1210322017-06-14T03:05:18Z Modelling of the elementary surface processes occurring in the course of heterogeneous catalytic reactions Holovko, M.F. Vakarin, E.V. 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. Подано короткий огляд теоретичних результатів для схем реакцій Лангмюра-Гіншельвуда та Елі-Ріделя. Показано, що ступені елементарних процесів на поверхні є зв’язані через об’ємні властивості адсорбованих компонент. Це пов’язано залежністю між хімічним потенціалом асоціативно-дисоціативного балансу і густиною адсорбату біля поверхні. Показано, що адсорбція є чутливою до механізму димерної адсорбції (асоціативної або дисоціативної). Дисоціативна адсорбція веде до немонотонної залежності покриття від поверхневої активності. Одночасно ступінь дисоціації зростає з ростом адсорбції. З асоціативною адсорбцією пов’язана можливість існування в області малих густин критичної точки, в околі якої адсорбційні ізотерми не є неперервними. Це приводить до аномально низької поверхневої дифузії в області малих густин. Коротко обговорюється вплив цих результатів на кінетичні властивості. 2000 Article 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. 1607-324X DOI:10.5488/CMP.3.2.417 PACS: 68.10.Jy, 82.65.Jv http://dspace.nbuv.gov.ua/handle/123456789/121032 en Condensed Matter Physics Інститут фізики конденсованих систем НАН України |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| language |
English |
| description |
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. |
| format |
Article |
| author |
Holovko, M.F. Vakarin, E.V. |
| spellingShingle |
Holovko, M.F. Vakarin, E.V. Modelling of the elementary surface processes occurring in the course of heterogeneous catalytic reactions Condensed Matter Physics |
| author_facet |
Holovko, M.F. Vakarin, E.V. |
| author_sort |
Holovko, M.F. |
| title |
Modelling of the elementary surface processes occurring in the course of heterogeneous catalytic reactions |
| title_short |
Modelling of the elementary surface processes occurring in the course of heterogeneous catalytic reactions |
| title_full |
Modelling of the elementary surface processes occurring in the course of heterogeneous catalytic reactions |
| title_fullStr |
Modelling of the elementary surface processes occurring in the course of heterogeneous catalytic reactions |
| title_full_unstemmed |
Modelling of the elementary surface processes occurring in the course of heterogeneous catalytic reactions |
| title_sort |
modelling of the elementary surface processes occurring in the course of heterogeneous catalytic reactions |
| publisher |
Інститут фізики конденсованих систем НАН України |
| publishDate |
2000 |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/121032 |
| citation_txt |
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. |
| series |
Condensed Matter Physics |
| work_keys_str_mv |
AT holovkomf modellingoftheelementarysurfaceprocessesoccurringinthecourseofheterogeneouscatalyticreactions AT vakarinev modellingoftheelementarysurfaceprocessesoccurringinthecourseofheterogeneouscatalyticreactions |
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2025-07-08T19:04:13Z |
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2025-07-08T19:04:13Z |
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1837106676331708416 |