Effect of Ce doping on the resistance of Na over V2O5-WO3/TiO2 SCR catalysts

Abstract Enhanced performance of Ce doping on the catalytic activity of V 2 O 5 -WO 3 /TiO 2 catalysts and its resistance properties to Na poisoning have been investigated in the research. Different Na species (NaCl and Na 2 O) were deposited on CeO 2 -V 2 O 5 -WO 3 /TiO 2 catalysts by impregnation method. The results presented that CeO 2 -V 2 O 5 -WO 3 /TiO 2 catalysts exhibited a higher NH 3 -SCR activity and better Na resistance than the V 2 O 5 -WO 3 /TiO 2 catalyst, and its poisoning resistance to Na 2 O is more superior than to NaCl, caused by more acid sites over the 10%CeO 2 -V 2 O 5 -WO 3 /TiO 2 (Ce 10 VWTi) catalyst, which indicated that the poisoning resistance of Na 2 O on Ce 10 VWTi catalysts is higher than that of NaCl. Combined with the characterization results, the dopant of Ce could enhance the surface chemisorbed oxygen on the Na poisoning V 2 O 5 -WO 3 /TiO 2 catalysts, facilitate the redox cycle, and increase the intensity of acid sites due to the newly formed Bronsted acid sites stemmed from C e 3 + − N H 4 + , thereby promoting catalytic activity and Na poisoning resistance.