Denitration catalyst is the core part of the SCR denitration technology, which determines the entire denitration system efficiency and economy. The current raw materials for producing SCR denitration catalyst in China are titanium dioxide, vanadium pentoxide, tungsten trioxide, stearic acid, ammonium metavanadate, polyethylene oxide, monoethanolamine, carboxymethyl cellulose, lactic acid, wood pulp and glass fiber ect.. Wherein the titanium dioxide as the carrier takes a larger proportion of about 85%; tungsten trioxide and vanadium pentoxide as the principal active ingredient, accounting for about 10%, of which about 7% is vanadium pentoxide. These three components account for about 95% of the total mass of the catalyst, other components although the proportion is relatively small, but they are also important with different physical and chemical properties.

 

Composition and function analysis:

1. The titanium dioxide, the so-called titanium dioxide, as the denitration catalyst carrier with the properties of chemically stable, good water-dispersible, large surface area etc.;

2. Tungsten trioxide, also known as tungsten oxide, tungsten anhydride, mainly improving the temperature adaptability and thermal stability of titanium dioxide, to avoid catalyst sintered and activity lost in the condition of high temperature (420°C) in a short time; Furthermore, tungsten trioxide can improve the ability of anti-poisoning from sulfide, thereby improving the operation efficiency of the catalyst;

3. Stearate, also known as stearic acid, exists as a lubricant in the denitration catalyst;

4. Ammonium metavanadate is used for preparing the main active ingredient - vanadium pentoxide in the denitration catalyst;

5. Polyoxyethylene is the binder and a pore-forming agent of the denitration catalyst;

6. Monoethanolamine is used in the preparation of ammonium metavanadate solution;

7. Lactate acid, also known as acid-propanol, as an adsorbent exists in the denitration catalyst;

8. Carboxymethyl cellulose (CMC) exists as an adhesive, plasticizer.