期刊
APPLIED ORGANOMETALLIC CHEMISTRY
卷 34, 期 3, 页码 -出版社
WILEY
DOI: 10.1002/aoc.5446
关键词
calcination temperatures; selectivity catalytic reduction; sulfate species; surface acidity
资金
- Doctoral Research Start-up Project of Henan University of Urban Construction [990/Q2017011]
- Henan Key Scientific Research Projects [20A610003]
- National Natural Science Foundation of China [21872096]
- Young Teacher Foundation of Henan University of Urban Construction [YCJQNGGJS201903]
A series of Ce-Fe-O-x catalysts prepared by the different calcination temperatures (marked as CF-X, where X represented calcination temperature) were used to the selectivity catalytic reduction of NOx by NH3. The results explained the relationship between calcination temperature and the sulfate species over Ce-Fe-O-x, and then investigated the surface acidity and catalytic performance. The large amounts of sulfate species were formed over CF-450 and CF-550 while it was decomposed with further the increasing of calcination temperature, which resulted in the loss of surface acidity, causing a decrease in the catalytic activity over Ce-Fe-O-x. Thereby, the CF-450 catalyst showed the best catalytic activity and over 90% NOx conversion was obtained at 244-450 degrees C. Besides, the favored pore structure, more Fe3+ active species, higher Ce3+ concentration and the abundance of chemical adsorbed oxygen species, as well as the surface acid sites, would together contribute to the excellent catalytic activity of CF-450 catalyst.
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