The promotion effect of Fe on CeZr2Ox catalyst for the low-temperature SCR of NOx by NH3
The promotion effect of Fe on CeZr2Ox catalyst for the low-temperature SCR of NOx by NH3
复制标题
DOI：
10.1007/s11164-018-3318-z
复制
发表时间：
2018-02
影响因子：
3.3
通讯作者：
Xiao Sun;R. Guo;Mingyin Li;P. Sun;W. Pan;Shu-ming Liu;Jian Liu;Shuai-wei Liu
中科院分区：
文献类型：
--
作者：
Xiao Sun;R. Guo;Mingyin Li;P. Sun;W. Pan;Shu-ming Liu;Jian Liu;Shuai-wei Liu
Fe was used as the modifier to improve the performance of CeZr2Oxcatalyst for the selective catalytic reduction (SCR) reaction with ammonia. Experimental results revealed that proper Fe species (Fe/Ce molar ratio = 2) could effectively improve the SCR activity of CeZr2Ox, along with the elevated resistance to SO2and H2O. The characterization results including BET, XRD, H2-TPR and NH3-TPD confirmed that Fe species in Fe2CeZr2Oxcatalyst could inhibit the formation of ZrO2crystals and lead to higher reducibility and surface acidity. In addition, more Ce3+and surface active oxygen species could be detected on Fe2CeZr2Oxcompared with CeZr2Ox. By means of in situ DRIFT technique, it could be deduced that the SCR reaction process over Fe2CeZr2Oxwas accelerated mainly through theL–H pathway due to the advanced adsorption of NH3and NOxspecies, along with the promoted NO conversion to NO2. Therefore, the modification of CeZrOxcatalyst by Fe had a significant stimulation effect on its low-temperature SCR performance.
