Scr catalyst for removal of nitrogen oxides

Abstract

The present invention provides for catalysts for selective catalytic reduction of nitrogen oxides. The catalysts comprise metal oxide supporters, vanadium, an active material, and antimony, a promoter that acts as a catalyst for reduction of nitrogen oxides, and at the same time, can promote higher sulfur poisoning resistance and low temperature catalytic activity. The amount of antimony of the catalysts is preferably 0.5-7 wt. %.

1 - 4 . (canceled) 
     
     
         5 . A denitrification catalyst comprising:
 a supporter comprising titanium dioxide (TiO 2 ); an active material comprising vanadium compounds; and a promoter comprising antimony compounds,   wherein the catalyst is active in nitrogen oxides reduction at a temperature of 300 É or lower and has sulfur poisoning resistance.   
     
     
         6 . The catalyst of  claim 5 , wherein the temperature is 230-300 É. 
     
     
         7 . The catalyst of  claim 5  wherein the active material is comprised in 1-3 wt. % and the promoter is comprised in 0.5-7 wt. %, based on the total weight of the catalyst. 
     
     
         8 . The catalyst of  claim 5  wherein the active material comprises vanadium oxides. 
     
     
         9 . The catalyst of  claim 5 , wherein the promoter comprises antimony oxides. 
     
     
         10 . The catalyst of  claim 5 , wherein the nitrogen oxides reduction is carried out in an efficiency of 90% or higher. 
     
     
         11 . The catalyst of  claim 5 , wherein the nitrogen oxides reduction is selective catalytic reduction (SCR) of nitrogen oxides. 
     
     
         12 . The catalyst of  claim 5  which consists of:
 a supporter comprising titanium dioxide (TiO 2 ); an active material comprising vanadium compounds; and a promoter comprising antimony compounds, 
 wherein the active material is comprised in 1-3 wt. % and the promoter is comprised in 0.5-7 wt. %, based on the total weight of the catalyst. 
 
     
     
         13 . A method of reducing nitrogen oxides at a temperature of 300 Éor lower, by using a catalyst comprising:
 a supporter comprising titanium dioxide (TiO 2 ); an active material comprising vanadium compounds; and a promoter comprising antimony compounds. 
 
     
     
         14 . The method of  claim 13 , wherein, in the catalyst, the active material is comprised in 1-3 wt. % and the promoter is comprised in 0.5-7 wt. %, based on the total weight of the catalyst. 
     
     
         15 . The method of  claim 13 , wherein the active material comprises vanadium oxides. 
     
     
         16 . The method of  claim 13 , wherein the promoter comprises antimony oxides. 
     
     
         17 . The method of  claim 13 , wherein the nitrogen oxides reduction is carried out in an efficiency of 90% or higher. 
     
     
         18 . The method of  claim 13 , wherein the catalyst has sulfur poisoning resistance. 
     
     
         19 . The method of  claim 13  which is selective catalytic reduction (SCR) of nitrogen oxides. 
     
     
         20 . The method of  claim 13 , wherein the temperature is 230˜300 É. 
     
     
         21 . The method of  claim 13 , wherein the catalyst consists of:
 a supporter comprising titanium dioxide (TiO 2 ); an active material comprising vanadium compounds; and a promoter comprising antimony compounds,   wherein the active material is comprised in 1-3 wt. % and the promoter is comprised in 0.5-7 wt. %, based on the total weight of the catalys