Selective catalytic reduction of NH₃ (NH₃-SCR) is the most popular method used in coal fired power plant to abate NO_x in the flue gas at present. V₂O₅-WO₃/TiO₂ catalyst is one of the key technologies for NH₃-SCR, and has a vitally important effect on the removal efficiency of NO_x for NH₃-SCR. However, the activity of catalysts will decrease gradually during the operation, and lead to the flue gas can’t meet the emission standard. The regeneration of deactivated SCR catalysts can recover the catalytic activity effectively, decrease the operation costs of SCR system, save the resource of metal, thus possesses important meaning for economy and environment. 

The Atmospheric Environment Group in IUE, CAS used the commercial SCR catalysts as the research samples, studied the deactivation and regeneration of SCR catalysts employed in coal fired power plant which burned typical coal in China. After several years of research, the group found that the impurity elements in the flue gas would deposit on the surface of SCR catalysts during the operation, and poisoned the active sites in different mode, thus caused the deactivation of catalysts. The group also mastered the regeneration mechanism of deactivated catalysts, optimized the formula of regeneration and recovered the activity of deactivated catalysts effectively, and the regeneration achieved the recycle of SCR catalysts. The group also made the integrated equipment for regeneration which could be used in factory. 

The researches were accomplished by PhD student Yanke Yu et al, and the corresponding author was Professor Jinsheng Chen. The research results were published in some important journals: Catalysis Communications, Industrial & Engineering Chemistry Research, Chinese Journal of Catalysisand Chinese Science Bulletin (in Chinese). In addition, 9 patents were granted. 

The work was financially supported by National Natural Science Foundation, Strategic Priority Research Program of the Chinese Academy of Sciences (B type), the Program of Innovation Team of the Bureau of Ningbo Science and Technology, and the Bureau of Science and Technology, Fujian Province. 

Article Link： 

http://www.sciencedirect.com/science/article/pii/S1566736713001775 

http://pubs.acs.org/doi/abs/10.1021/ie502065b 

http://www.chxb.cn/EN/10.1016/S1872-2067(15)60993-7