Research Progress on Anti-SO2 Poisoning Catalysts for VOCs Catalytic Combustion
In the catalytic oxidation process of VOCs,sulfur dioxide is easy to produce competitive adsorption behavior with reactants at the active sites of the catalyst,and can react with active species or carriers to produce sulfate,causing catalyst poisoning,which seriously affects the efficiency of catalytic oxidation reaction.This review summarizes the SO2 poisoning behavior of catalysts,outlines the anti-SO2 poisoning measures widely used in the design of noble metal and non-noble metal catalysts,such as additive doping,bimetal system construction,carrier modification,core-shell structure design,etc.,and analyzes the principle of strengthening the acid site of catalysts,structural stability,shell protection and other resistance to SO2 adsorption and reaction.Finally,the design of anti-SO2 poisoning catalysts in the field VOCs is summarized and prospected.
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