Ammonium Metatungstate Preparing WO3 Plate SCR Denitration Catalyst--Dry Powder Mixing Method

The main component of tungsten trioxide plate denitration catalyst is just similar to honeycomb denitration catalyst, both are based on vanadium pentoxide, tungsten trioxide as the main active substance, titanium dioxide as the carrier. Compared with cellular, it has a stronger capacity of ash anti-clogging, wear resistance, less consumption under dust and low pressure loss ect.; although its market share is only about 1/3 of the cellular, it will gradually expand with the further launch of high-dust flue gas denitration in China.

plate denitration catalyst

The process that dry powder mixing method prepares tungsten trioxide plate denitration catalyst is as follows:
1. Put the titanium dioxide powder, stearate acid, AK sugars, methyl cellulose into the kneader, stir for about 10 minutes;
2. Add pulp slurry and stir for about 10 minutes;
3. Add silica sol solution and continually stir for 10 minutes;
4. Add the lactic acid, ammonia, ammonium metavanadate and suitable amount of deionized water into the mixed solution prepared above, then stir for about 1 hour for sufficiently reacting;
5. Add glass fiber and tungsten compound containing with tungsten trioxide (ammonium paratungstate, ammonium metatungstate ect.), stirring for about 30 minutes to prepare a catalyst mud;
6. Forming to generate the wet catalyst;
7. Dry the catalyst at 100 °C to remove excess free water;
8. Roasting, the purpose of it is: at the same time titanium dioxide crystal transition does not occurred, decompose the organic matter and active ingredient precursors; studies have shown that the active ingredient precursors and organic substances are decomposed completely at 400°C, the polymerization of vanadium pentoxide has been improved as the temperature increasing, but the titanium dioxide crystalline transition may occur, thus will cause the properties of catalyst reduced; therefore, calcination at the proper temperature, we can finally get the best active tungsten trioxide plate denitration catalyst.

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