Ammonium Paratungstate to Prepare Waste Gas Purification Catalyst of Porous

In traditional denitration of combustion flue gas, ammonia (NH₃) is used as reducing agent to decomposition NOx into N and water vapor (H₂O). Denitration catalysts are widely applied in the denitrification reaction, to improve the reaction rate and efficiency at the same time. In the past, in order to improve the decomposition rate of NOx, improving the ratio of NH₃/NOx is a common method. However, the unreacted ammonia will be mixed into the waste and directly discharged into the atmosphere when excessive increasing the molar ratio of NH3/NOx, thus resulting in secondary pollution.

Waste gas purification catalyst is prepared by using special coating material, and precious metals as activity components, which is widely used for waste gas purification and deodorization treatment in chemical, pharmaceutical and so on, and especially in denitrification. In this paper, we will provide a method for preparing waste gas purification catalyst, which the specific steps are as follows:

1. Add ammonia into amount of metatitanic acid, and slurry is generated after full reaction;
2. Add ammonium paratungstate into the slurry that prepared in step 1;
3. Milling the mixture obtained in step 2;
4. Drying and calcining o obtain the catalyst;
5. Adjust the pore volume to 0.25~0.40g/cc; milling the catalyst powder, forming additives (if necessary) and water in the mixer; molding, drying and calcining for preparing the waste gas purification catalyst of porous we needed.

• < Prev
• Next >