Research progress, challenges and perspectives on the sulfur and water resistance of catalysts for low temperature selective catalytic reduction of NOx by NH3

Abstract

Low temperature selective catalytic reduction (SCR) is an efficient and promising technology to transform NOx into N2 from flue gases, which has broad application prospects. However, the vulnerability of low temperature DeNOx catalysts to poisoning by SO2 and H2O restricts their industrial application. Therefore, it is vitally important to develop new low temperature DeNOx catalysts that resist poisoning. This paper reviews the mechanisms of SO2 & H2O poisoning of low temperature SCR catalysts, the strategies for improving the resistance of low temperature SCR catalysts to SO2 & H2O poisoning, application of theoretical calculations in the development of SO2 & H2O resistant low temperature SCR catalysts as well as novel ideas for developing poisoning resistant low temperature SCR catalysts. Moreover, the studies dealing with the regeneration of low temperature DeNOx catalysts are also included. Based on the problems detailed in this review, the challenges and the emphasis for future research in this area are also proposed. We believe that this review will provide an excellent foundation and good guidance for the future design and the development of improved SO2 & H2O-tolerant low temperature DeNOx catalysts.