Enhanced Low-temperature NH_3-SCR Activity over Ce-Ti Oxide Catalysts by Hydrochloric Acid Treatment

Ye Jiang ； Weiyun Shi ； Mingyuan Lu ； Qingyi Li ； Chengzhen Lai ； Wenqian Gao ； Lin Yang ； Zhengda Yang

《Aerosol and Air Quality Research》 19卷11期 (2019/11) Pp. 2381-2386

https://doi.org/10.4209/aaqr.2019.04.0184

摘要

The effect of hydrochloric acid treatment on Ce-Ti oxides was investigated for selective catalytic reduction of NO with NH_3. The results showed that hydrochloric acid treatment had a positive effect on the low-temperature activity of Ce-Ti oxides. The improved activity of Ce-Ti oxides could be attributed to the increase in the concentration of Ce as well as the amount of Ce^(3+) and chemisorbed oxygen on the catalyst surface. In addition, the enhanced Lewis acidity could improve NH_3 absorption, and was also a key factor to enhance the low-temperature activity of Ce-Ti oxides.

關鍵字

NH_3-SCR ； Ce-Ti oxide ； Hydrochloric acid treatment ； Activity