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Synergistic Catalytic Effect of Cobalt and Cerium in the PreferentialOxidation of Carbon Monoxide on ModifiedCo/Ce/ZSM-5 Zeolitesстатья
Дата последнего поиска статьи во внешних источниках: 15 декабря 2021 г.
- Авторы: Ivanin I.A., Krotova I.N., Udalova O.V., Zanaveskin K.L., Shilina M.I.
- Журнал: Kinetics and Catalysis
- Том: 62
- Номер: 6
- Год издания: 2021
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 799
- Последняя страница: 812
- DOI: 10.1134/S0023158421060082
- Аннотация: A series of mono- and bimetallic cobalt–cerium catalysts based on ZSM-5 zeolite with differentsilicate moduli (SiO2/Al2O3 = 30, 55, and 80) was synthesized by incipient wetness impregnation. The atomicratio of metals (Co + Ce)/Al in bimetallic samples ranged from 0.5 to 1.5. A synergistic catalytic effect ofcobalt and cerium in the prepared composites manifested itself in the reactions of complete and preferential oxidation of CO (CO-PROX) in an excess of hydrogen. The catalysts in which an atomic ratio between Co and Ce was close to 3 were the most active. In these cases, the conversion of CO in the CO-PROX reactionreached 95% at 190–200°C. With the use of TEM, SEM, and DRIFT spectroscopy of adsorbed CO, including in situ studies of reduction processes under the action of CO, it was found that cobalt oxo cations and mixed cobalt and cerium oxo cations located in exchange positions of the zeolite play a key role in the oxidation reactions. The use of zeolite with SiO2/Al2O3 = 55 provided an optimal balance between the high activity of Co/Ce catalysts in CO oxidation and the selectivity of CO2 formation in the presence of hydrogen.
- Добавил в систему: Шилина Марина Ильинична
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