Ye Jiang 1, Weiyun Shi1, Mingyuan Lu1, Qingyi Li2, Chengzhen Lai1, Wenqian Gao1, Lin Yang1, Zhengda Yang 1

College of New Energy, China University of Petroleum, Qingdao 266580, China
Zhejiang Energy Group Co., Ltd., Hangzhou 310007, China

Received: June 18, 2019
Revised: October 2, 2019
Accepted: October 4, 2019
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Cite this article:
Jiang, Y., Shi, W., Lu, M., Li, Q., Lai, C., Gao, W., Yang, L. and Yang, Z. (2019). Enhanced Low-temperature NH3-SCR Activity over Ce-Ti Oxide Catalysts by Hydrochloric Acid Treatment. Aerosol Air Qual. Res. 19: 2381-2386.


  • Enhanced low-temperature SCR activity of Ce-Ti oxide treated by hydrochloric acid.
  • Increase in the amount of Ce3+ and chemisorbed oxygen on the catalyst surface.
  • The enhanced Lewis acidity was beneficial to adsorb more NH3.



The effect of hydrochloric acid treatment on Ce-Ti oxides was investigated for selective catalytic reduction of NO with NH3. 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 Ce3+ and chemisorbed oxygen on the catalyst surface. In addition, the enhanced Lewis acidity could improve NH3 absorption, and was also a key factor to enhance the low-temperature activity of Ce-Ti oxides.

Keywords: NH3-SCR; Ce-Ti oxide; Hydrochloric acid treatment; Activity.

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