Coke Deactivation of Acid Sites on ZSM-5 Zeolite Научная публикация
| Конференция |
Catalyst Deactivation 2001 : 9th International Symposium 07-10 окт. 2001 , Lexington, KY |
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| Сборник | Catalyst Deactivation 2001 : Proceedings of the 9th International Symposium,
7-10 October 2001, Lexington, KY USA Сборник, 2001. 523 c. ISBN 978-0-444-50477-7. |
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| Журнал |
Studies in Surface Science and Catalysis
ISSN: 0167-2991 |
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| Вых. Данные | Год: 2001, Том: 139, Страницы: 77-84 Страниц : 8 DOI: 10.1016/S0167-2991(01)80183-X | ||||
| Авторы |
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Реферат:
Acid centers (AC’s) on ZSM-5 external surfaces remain active in catalysis and visible by IR spectroscopy under progressive accumulation of condensed coke structures on them. With increasing amounts of accumulated coke, the strengths of the AC’s gradually decrease as evidenced by catalysis results and changes in the frequencies of stretching vibrations of OH- groups after CO adsorption. The number of catalytically valuable AC’s remains constant up to monolayer coverage of the external zeolite surfaces. A scheme for a condensed coke structure growing on the outer surface of ZSM-5 crystals is suggested. Coke agglomerates, though linked to acid sites, nevertheless leave them accessible for the reagent molecules. Coke agglomeration proceeds at the expense of carbon atom addition at the active site, while the agglomerate itself “swims” over the zeolite crystal surface and is most likely linked to the silanol OH-groups. The larger the agglomerate, the higher its degree of condensation, the greater the delocalization of its electron density over the structure of condensed aromatic rings, the further the shift of its electron density onto the active site proton, and the weaker its active site.
Библиографическая ссылка:
Echevsky G.V.
, Ayupov A.B.
, Paukshtis E.A.
, O’Rear D.
, Kibby C.
Coke Deactivation of Acid Sites on ZSM-5 Zeolite
В сборнике Catalyst Deactivation 2001 : Proceedings of the 9th International Symposium, 7-10 October 2001, Lexington, KY USA. 2001. – C.77-84. – ISBN 978-0-444-50477-7. DOI: 10.1016/S0167-2991(01)80183-X WOS Scopus РИНЦ CAPlusCA OpenAlex
Coke Deactivation of Acid Sites on ZSM-5 Zeolite
В сборнике Catalyst Deactivation 2001 : Proceedings of the 9th International Symposium, 7-10 October 2001, Lexington, KY USA. 2001. – C.77-84. – ISBN 978-0-444-50477-7. DOI: 10.1016/S0167-2991(01)80183-X WOS Scopus РИНЦ CAPlusCA OpenAlex
Даты:
| Опубликована в печати: | 1 янв. 2001 г. |
| Опубликована online: | 2 сент. 2007 г. |
Идентификаторы БД:
| Web of science: | WOS:000177817200010 |
| Scopus: | 2-s2.0-0035787208 |
| РИНЦ: | 13381209 |
| Chemical Abstracts: | 2002:146011 |
| Chemical Abstracts (print): | 136:357265 |
| OpenAlex: | W2276964805 |