锰基低温SCR脱硝催化剂抗硫抗水性能研究进展

SO_2 and H_2O poisoning resistance of manganese oxide-based catalysts for low-temperature selective catalytic reduction of NO_x

锰基催化剂以其良好的低温脱硝活性受到越来越多的关注,在低温脱硝领域具有广阔的应用前景.然而,在实际应用过程中,反应气氛中存在的SO_2和H_2O容易造成催化剂中毒失活.本文分析了锰基催化剂在低温氨选择性催化还原(NH_3-SCR)过程中SO_2和H_2O的中毒机理,重点介绍了提高锰基催化剂抗硫抗水性方面的研究进展,从添加过渡金属助剂、改变形貌和改变制备方法等3个方向展开分析.最后针对目前锰基催化剂存在的问题,提出了改进意见,并对锰基脱硝催化剂未来的发展方向和应用前景进行了展望.

Mn-based catalysts have been demonstrated to possess good low-temperature activity for NH3-SCR of NO,and have attracted increasing attention and broad application prospects. However,the catalysts suffer from poisoning deactivation easily when SO2 and H2O exist in the reactant gases.In this paper,the poisoning mechanism of SO2 and H2O on Mn-based catalysts has been expounded.Besides,the review focuses on the progress of research on improving the sulfur and water resistance of Mn-based catalysts,which is summarized in three aspects： adding transitional metals additives,controlling the morphology of catalysts and changing the preparation method. Finally,the existing problems of Mn-based catalysts are pointed out,the suggestions for improvement are prospected,and then the prospect of future development of Mn-based catalysts is put forward.