Currently, the commonly used SCR denitration catalysts are mainly V-W-Ti system. Among them, titanium dioxide accounted for more than 80% of the total mass, the remaining part is vanadium pentoxide and tungsten trioxide and other active substances. Since titanium dioxide is expensive, and mostly dependent on import, which restricts the development of the denitration catalyst industry. After continuous efforts of related manufacturers and researchers, they proposed a method of diatomite replacing titanium dioxide for preparing the cellular denitration catalyst, to solve the conventional problems of high cost of catalyst, low utilization of diatomaceous earth. It is prepared as follows:

 

1. Acidification of diatomite: Impregnate diatomite into the acid solution with pH value of 2 and stir for 1~4 hours, aged overnight, then dry and ground;

2. The slurry mixing: Add 50~70 portions of acidified diatomite, 10~30 portions of titanium dioxide, 1~10 portions of active ingredients (tungsten trioxide, vanadium pentoxide, etc.) and 10 portions of forming additives into a kneader, and then add 300~400 portions of deionized water, then uniformly mixed with stirring at the speed of 200~1000r/min for 3 hours to obtain a slurry;

3. Extrusion: Put the slurry obtained in step 2 into a vacuum pug mill to knead for 2~4 times, then transferred into a hydraulic extruder to form the embryo of honeycomb denitration catalyst;

Noted: The kneading conditions is under a temperature of 20 ~ 100 ° C, vacuum degree of 0.085 MPa; the extrusion pressure is 2~5Mpa;

4. Drying: Drying the honeycomb denitration catalyst embryo under 25~80°C for 24~28 hours;

5. Calcination: The dried honeycomb denitration catalyst embryo is calcined under 200~650°C for 12~48 hours, cut after it cooled down to room temperature to give the products -- low-cost tungsten trioxide cellular denitration catalyst.

 

This kind of honeycomb denitration catalyst takes diatomite and titanium dioxide as mixed support, can lower the cost, and with simple processing method; furthermore, the catalyst itself has a good denitration activity and wear resistance, all these can effectively reduce the cost of catalyst manufacturing and denitration project, which meets the requirement of large-scale industrial production.