期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 123, 期 15, 页码 9926-9934出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.9b00986
关键词
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资金
- ESI platform of Paul Scherrer Institute
Autoreduction of Cu-II-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 Cu-II ions to Cu-I.
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