Currently, dust removal, desulfurization and denitrification in the flue gas purification process are carried out separately, such as near zero emission technology route in thermal power plant is generally SCR denitration went on with electrostatic dust removal, which is called wet electrostatic precipitator. Nowadays, the most widely used SCR denitration catalysts are almost taking titanium dioxide, zeolites, activated carbon or alumina ceramic honeycomb as the carrier, and tungsten trioxide and vanadium pentoxide as the main active ingredients. SCR denitration catalyst is easy to poisoned to fail in activity. Therefore, how to extend the catalyst life, improve the efficiency of denitration equipment, reduce the overall investment in environmental protection is becoming an important topic. The method to produce denitration catalyst active mother liquor with titania-silica/tungsten trioxide was pointed out, the mother liquor can be applied in a ceramic tube filter to achieve the goal of integration denitrification and dust removal.

 

Preparation steps are as follows:

1.Dissolving ammonium metatungstate and ammonium metavanadate respectively in oxalic acid solution;

2.Adding the active titanium oxide, silicon powder into mixed solution which is obtained in step 1 with stirring to form a mixed solution;

3.Drying and calcining the mixed solution to generate titania-silica/tungsten trioxide powder; wherein the drying condition is at the temperature 100~130°C for 3~6 hours; calcination condition is at the temperature of 500~550°C for 4~6 hours;

4.Joining the mixed powder into oxalic acid solution containing ammonium metavanadate, and stirring uniform to form a mixed slurry;

5.Putting binder into the mixed slurry and stirring for 3~5 hours to form the denitration catalyst active mother liquor with titania-silica/tungsten trioxide.