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Autoreduction of Copper in Zeolites: Role of Topology, Si/Al Ratio, and Copper Loadingстатья Исследовательская статья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 3 июля 2019 г.
- Авторы: Sushkevich V.L., Smirnov A.V., van Bokhoven J.A.
- Журнал: Journal of Physical Chemistry C
- Том: 123
- Номер: 15
- Год издания: 2019
- Издательство: American Chemical Society
- Местоположение издательства: United States
- Первая страница: 9926
- Последняя страница: 9934
- DOI: 10.1021/acs.jpcc.9b00986
- Аннотация: Autoreduction of CuII-oxo species in the copper-exchanged zeolites MOR, MFI, BEA, and FAU was studied using temperature-programmed desorption of oxygen and in situ X-ray absorption spectroscopy. The zeolite topology and the Si/Al ratio have a significant effect on the onset temperature and rate of copper reduction, which originates from a different structure of the copper-oxo species, as dictated by the nature of the zeolite and the Si/Al ratio. In contrast, the autoreduction of copper hardly reacted to the variation in copper loading when the Si/Al ratio was constant, as shown for mordenite. Thus, there is a disparate effect of copper concentration on copper speciation and, consequently, on autoreduction, because of either the variation in the Si/Al ratio or incomplete exchange. Quantitative analysis revealed that the release of one oxygen molecule is accompanied by the reduction of four CuII ions to CuI.
- Добавил в систему: Смирнов Андрей Валентинович