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Enhanced Low-temperature NH3-SCR Activity over Ce-Ti Oxide Catalysts by Hydrochloric Acid Treatment

Category: Aerosol Physics and Instrumentation

Volume: 19 | Issue: 11 | Pages: 2381-2386
DOI: 10.4209/aaqr.2019.04.0184
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Ye Jiang 1, Weiyun Shi1, Mingyuan Lu1, Qingyi Li2, Chengzhen Lai1, Wenqian Gao1, Lin Yang1, Zhengda Yang 1

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

Highlights

  • 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.

Abstract

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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