Catalyst with high activity and stability is the core technology of SCR flue gas denitration. SCR catalyst can be divided into precious metal, metal oxide and zeolite catalysts according to components. The widely used presently is metal oxide catalysts, especially the V2O5/TiO2, V2O5-WO3/TiO2 vanadium-based catalyst have the highest activity. 

 

Mesoporous foam material has a large surface area, which can increase the loading amount of active ingredients and Additives; at the same time, mechanical stability will be improved because of the large pore foam which is beneficial for gas adsorption and desorption. Tils paper provide situ synthesis method to produce mesoporous foam structure WO3 SCR denitration catalyst with low cost, and the products has a strong anti-sintering capacity, high dispersion of the active ingredient, thus to improve the denitration activity.

 

Steps:

1.Take a certain amount of polyethylene glycol - polypropylene glycol - triblock compound polyethylene glycol (average molecular weight 5800), and dissolve it in 0.5-3mol/L hydrochloric acid solution, then stir for 2~4 hours;

2.Add the amount of trimethylbenzene into solution obtained in step 1 with stirring;

3.Add a certain amount of TEOS solution and aluminum chloride into solution generated in step 2, and then add 0.05~3mol/L of sodium tungstate solution, stirring for 30 minutes, then add ammonium metavanadate of oxalic acid solution;

4.The solution obtained in step 3 stirred for more than 4 hours by a magnetic stirrer, and then placed in hot water with 80~100° C for 48 hours, cooled to room temperature, separated, the resulting precipitate is washed and dried;

5.Calcining the precipitate at 500-800°C for 5-8 hours to generate the final V2O5-WO3-Al2O3-SW2 mesoporous foam structure catalysts.