Currently, the dipping method is widely used because of its sample equipment and easy to operate in the domestic production of loading aid WO₃ and active ingredient V₂O₅. However, the distribution of active ingredient and adjuvants uniformly on the carrier TiO₂ with this method, and forming a large number of aggregations of vanadium which is influencing the denitration activity by affect the strong interaction between carriers. This paper presents a method of improving the impregnation solution by adding additives to improve the dispersion of vanadium and WO₃, thus to increase the interaction between carriers, thereby improving the catalyst activity. 


 

Steps are as follows:

1.Weigh the raw materials: weight the materials nano TiO₂, WO₃, ammonium metatungstate, vanadium ammonium oxalate solution, triethanolamine at a certain percentage;

2.Mixing the raw materials into deionized water, then adding TiO₂ and stirring; wherein the oxalic acid concentration is l-2mol/L, and enough to dissolve ammonium metavanadate completely;

3.Drying at 70~120°C for 6 ~10 hours;

4.Calcinating the dried product in the air at 400-520°C for 3-6 hours;

5.Roasting in the original temperature in step 4 by introducing the reducing gas for 15-60 minutes, then removed the reducing gas, natural cooling down to obtain the efficient tungsten trioxide denitration catalyst. This step aims to adjust the firing atmosphere to further enhance the interaction between active ingredient and the carrier, thereby improving the denitration efficiency.