Catalyst for synergistic control of oxynitride and mercury and method for preparing the same

A method for preparing a catalyst for synergistic control of oxynitride and mercury, wherein the method comprises the following steps:

• 1) drying TiO2 and use TiO2 as a carrier;
• 2) stirring ammonium metavanadate and ammonium metatungstate under 50° C.-70° C. to dissolve in an oxalic acid or tartaric acid solution to obtain a solution A with pH value less than 2;
• stirring chromic nitrate under 10-50° C. to dissolve in deionized water or tartaric acid to obtain a solution B;
• stirring niobium oxalate under 50-70° C. to dissolve in deionized water or tartaric acid to obtain a solution C;
• 3) stirring cupric nitrate under 10-50° C. to dissolve in deionized water or tartaric acid to obtain a solution D;
• or stirring ferric nitrate under 10-50° C. to dissolve in deionized water or tartaric acid to obtain a solution E;
• or stirring ammonium molybdate under 10-50° C. to dissolve in deionized water or tartaric acid to obtain a solution F;
• 4) mixing the solution A, solution B and solution C with one of the solution D, solution E and solution F to obtain an impregnating solution, immersing the carrier from step 1) into the impregnating solution, stirring evenly for ultrasound concussion, evaporating and stirring with water bath for 10-60 minutes, drying in the oven and then calcine under 400° C.-550° C. for 3-5 hours to obtain the catalyst for synergistic control of oxynitride and mercury.