稀土学报（英文版）
稀土學報（英文版）
희토학보（영문판）
JOURNAL OF RARE EARTHS
2015年
7期
726-735
,共10页
李军燕%宋忠贤%宁平%张秋林%刘昕%李昊%黄真真
李軍燕%宋忠賢%寧平%張鞦林%劉昕%李昊%黃真真
리군연%송충현%저평%장추림%류흔%리호%황진진
CeO2-ZrO2-WO3%selective catalytic reduction%calcination temperature%amorphous%synergistic interaction%rare earths
A series of CeO2-ZrO2-WO3 catalysts for the selective catalytic reduction (SCR) of NO with NH3 were prepared by hydro-thermal method. The influence of calcination temperature on the catalytic activity, microstructure, surface acidity and redox behavior of CeO2-ZrO2-WO3 catalyst was investigated using various characterization methods. It was found that the CeO2-ZrO2-WO3 catalyst calcined at 600 oC showed the best catalytic performance and excellent N2 selectivity, and yielded more than 90% NO conversion in a wide temperature range of 250–500 oC with a space velocity (GHSV) of 60000 h–1. As the calcination temperature was increased from 400 to 600 oC, the NO conversion obviously increased, but decreased at higher calcination temperature. The results implied that the higher surface area, the strongest synergistic interaction, the superior redox property and the highly dispersed or amorphous WO3 species contributed to the excellent SCR activity of the CeO2-ZrO2-WO3 catalyst calcined at 600 oC.
