Shaojun Liu1,2,3, Peidong Ji1, Dong Ye1, Ruiyang Qu1, Chenghang Zheng1, Xiang Gao 1

State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212003, China
Key Laboratory of Low-grade Energy Utilization Technologies and Systems (Chongqing University), Ministry of Education of China, Chongqing University, Chongqing 400044, China

Received: July 24, 2018
Revised: November 12, 2018
Accepted: December 11, 2018
Download Citation: ||  

Cite this article:
Liu, S., Ji, P., Ye, D., Qu, R., Zheng, C. and Gao, X. (2019). Regeneration of Potassium Poisoned Catalysts for the Selective Catalytic Reduction of NO with NH3. Aerosol Air Qual. Res. 19: 649-656.


  • The effect of K on SCR activity and the regeneration of catalyst were investigated.
  • Surface K species were removed in acid washing, and occupied acidic sites released.
  • Extra active components were added for CeO2 doping.
  • Poisoned catalysts were washed with H2SO4 solution and then doped with 5 wt.% CeO2.


In this study, we investigated the effect of potassium on the activity and regeneration of potassium-poisoned SCR catalysts. With the addition of potassium species, the NO conversion rate of the catalysts continuously decreased. After washing the poisoned catalysts with an H2SO4 solution or doping them with CeO2, the activity of the catalysts was improved to different extents. Acid washing almost completely removed the surface potassium species, freeing acidic sites to adsorb NH3, but it also potentially removed some of the active components, such as vanadia. CeO2 doping, on the other hand, added active components. Combining these two methods, the poisoned catalysts were washed with an H2SO4 solution and then doped with 5 wt.% CeO2. It was found that the level of activity could be restored to that of a fresh catalyst, and a conversion rate of over 90% was observed for NO between 300°C and 450°C, as the added CeO2 compensated for the active components lost during SCR reactions. Consequently, the above hybrid method shows high potential for regenerating commercial SCR catalysts.

Keywords: Selective catalytic reduction; Potassium; Deactivation; Regeneration; Ceria.


Don't forget to share this article 


Subscribe to our Newsletter 

Aerosol and Air Quality Research has published over 2,000 peer-reviewed articles. Enter your email address to receive latest updates and research articles to your inbox every second week.

Latest coronavirus research from Aerosol and Air Quality Research

2018 Impact Factor: 2.735

5-Year Impact Factor: 2.827

SCImago Journal & Country Rank

Sign up to AAQR Newsletter

Sign up to receive latest research, letters to the editors, and review articles, delivered to your inbox every second week!