Effectively promoted catalytic activity by adjusting calcination temperature of Ce-Fe-Ox catalyst for NH3-SCR

被引:13
作者
Song, Zhongxian [1 ]
Xing, Yun [2 ]
Zhang, Tingji [2 ]
Zhao, Jinggang [2 ]
Wang, Junkai [2 ]
Mao, Yanli [1 ]
Zhao, Baolin [1 ]
Zhang, Xuejun [2 ]
Zhao, Min [2 ]
Ma, Ziang [2 ]
机构
[1] Henan Univ Urban Construct, Fac Environm & Municipal Engn, Henan Key Lab Water Pollut Control & Rehabil Tech, Pingdingshan 467000, Peoples R China
[2] Shenyang Univ Chem Technol, Coll Environm & Safety Engn, Shenyang 110142, Liaoning, Peoples R China
基金
中国国家自然科学基金;
关键词
calcination temperatures; selectivity catalytic reduction; sulfate species; surface acidity; NO REDUCTION; ENHANCED PERFORMANCE; MIXED OXIDES; NH3; CERIA; SCR; AMMONIA; SO2; COMBUSTION; RESISTANCE;
D O I
10.1002/aoc.5446
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
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.
引用
收藏
页数:9
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