Research progress in the SO2 resistance of the catalysts for selective catalytic reduction of NOx

The selective catalytic reduction(SCR) of NOwith NHhas been proven to be an efficient technology for NOconversion to N. However, the catalysts used for SCR usually suffer from the problem of sulfur poisoning which seriously limits their practical application. This review summarized sulfur poisoning mechanisms of various SCR de NOcatalysts and strategies to reduce deactivation caused by SOsuch as doping metals, controlling the structures and morphologies of the catalysts, and selecting appropriate supports. The methods and procedures of catalysts preparation and the reaction conditions also have effect on SO-resistance of the catalysts.Several novel catalyst systems that exhibited good SOresistance are also introduced. This paper could provide guidance for the development of highly efficient sulfur-tolerant de NOcatalysts.