The Effect of Transition Alumina (γ-, η-, χ-Al2O3) on the Activity and Stability of Chromia/Alumina Catalysts. Part I: Model Catalysts and Aging Conditions Full article
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Energy Technology
ISSN: 2194-4288 |
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| Output data | Year: 2019, Volume: 7, Number: 4, Article number : 1800735, Pages count : 9 DOI: 10.1002/ente.201800735 | ||
| Tags | alumina; chromia; dehydrogenation; irreversible deactivation; supported catalysts | ||
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| Affiliations |
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Funding (1)
| 1 | Federal Agency for Scientific Organizations | 0303-2016-0010 |
Abstract:
In this work, an effect of transition alumina (γ-, η-, χ-Al2O3) on the activity and stability of model chromia/alumina catalysts with 4 wt. % Cr in isobutane dehydrogenation has been studied. It has been shown that a fresh catalyst with η-Al2O3 as a support has the highest activity, while with χ-Al2O3, the lowest one. The characterization of the catalysts by N2 adsorption, XRD, ESR and XPS has been used in order to describe changes in the catalysts induced by the high temperature treatment at 800°С, 1000°С and 1200°С in air. It has been shown that sintering of the alumina support and formation of chromia-alumina solid solutions are the reasons of irreversible decline in the catalytic activity. Cr/γ-Al2O3 was found to be the most stable to sintering and phase transformation, while Cr/χ-Al2O3, the least stable. Owing to its highest initial activity, the η-Al2O3 supported catalyst loses its dehydrogenation activity most rapidly as the calcination temperature is raised. The segregation of sodium impurities is observed in the course of heat treatment, which may be an additional cause of deactivation
Cite:
Nazimov D.A.
, Klimov O.V.
, Trukhan S.N.
, Cherepanova S.V.
, Prosvirin I.P.
, Noskov A.S.
The Effect of Transition Alumina (γ-, η-, χ-Al2O3) on the Activity and Stability of Chromia/Alumina Catalysts. Part I: Model Catalysts and Aging Conditions
Energy Technology. 2019. V.7. N4. 1800735 :1-9. DOI: 10.1002/ente.201800735 WOS Scopus РИНЦ AN OpenAlex
The Effect of Transition Alumina (γ-, η-, χ-Al2O3) on the Activity and Stability of Chromia/Alumina Catalysts. Part I: Model Catalysts and Aging Conditions
Energy Technology. 2019. V.7. N4. 1800735 :1-9. DOI: 10.1002/ente.201800735 WOS Scopus РИНЦ AN OpenAlex
Dates:
| Submitted: | Aug 13, 2018 |
| Accepted: | Oct 5, 2018 |
| Published online: | Oct 24, 2018 |
| Published print: | Apr 1, 2019 |
Identifiers:
| Web of science: | WOS:000466486200022 |
| Scopus: | 2-s2.0-85063967409 |
| Elibrary: | 38668846 |
| Chemical Abstracts: | 2019:742370 |
| OpenAlex: | W2898405731 |