Core-shell structure effect on CeO2 and TiO2 supported WO3 for the NH3-SCR process
Core-shell structure effect on CeO2 and TiO2 supported WO3 for the NH3-SCR process
复制标题
NH3-SCR 工艺中 CeO2 和 TiO2 负载 WO3 的核壳结构效应
DOI：
10.1016/j.mcat.2020.110822
复制
发表时间：
2020-04-01
影响因子：
4.6
通讯作者：
Zhang, Runduo
中科院分区：
文献类型：
--
作者：
Liu, Shanshan;Wang, Hao;Zhang, Runduo
A series of CeTi samples (CeO2/TiO2, TiO2@CeO2, TiO2/CeO2, and CeO2@TiO2) was prepared and modified by tungsten. The 5 %WO3/TiO2 @CeO2 (W/Ti@Ce) catalyst exhibited the best NH3-SCR performance (NO conversion and N-2 yield above 95 % at 250-500 degrees C) due to the synergistic effect of redox ability and acidity. The techniques of XPS, H-2-TPR, and NH3-TPD were introduced to reveal the effect of Ce3+ atom contents, redox properties and acidity on catalytic performance. W/Ti@Ce shows good redox ability, which is conducive to the low-temperature selective catalytic reduction (SCR) reaction. NH3-TPD results show that W/Ti@Ce have a large amount of medium- and strong-strength acids, which are conducive to high-temperature SCR reaction. Therefore, the core-shell catalyst has the optimal synergistic effect of redox property and acidity, which is in favor of the excellent NH3-SCR performance. Furthermore, the W/Ti@Ce with a core-shell structure displayed better SO2 resistance due to the stronger interaction between Ce and Ti.
