SCR denitration catalyst has many forms, there are metal oxides, carbon-based catalyst, precious metals ect. according to their active ingredients. zeolite ion exchange,  and carbon-titanium composite oxide. Most of coal-fired power plants are using the catalysts based on metal oxides, such as tungsten trioxide; carbon-based catalyst used for flue gas desulfurization and denitrification simultaneously has been developed. The shapes of plate and honeycomb catalysts are commonly used in coal-fired power plant technology.

 

The activity of tungsten trioxide SCR denitration catalyst can be affected by many factors, wherein the reaction temperature, active ingredient and ammonia injected amount have the greater impact.Tungsten trioxide SCR denitration catalyst has the highest activity at 250~450°C which is the common temperature set in denitration reaction, particularly the 350~400°C is preferred. When temperature is out of this range, the catalyst performance will be reduced. Especially when using in high-temperature region, the catalyst will partly or entirely deactivation since the surface of catalyst sintered because of the extortionate temperature, thus resulting in the catalyst’s life shortened. However, as denitration equipments applying in more fields, tungsten trioxide SCR denitration catalyst is supposed to have a wider temperature range.

 

Tungsten trioxide SCR denitration catalyst with various applications and best properties can be manufactured by selecting the appropriate active metal components. The amount of metal oxides are based on the set up ability of denitration equipments, the more active ingredients, the higher activity the denitration catalyst will have.

 

Ammonia, as a reducing agent, the amount of it is almost equal to NOx in the exhaust gas. Increasing the amount of ammonia can improve the activity of tungsten trioxide SCR denitration catalyst, however, the initiative will also cause the serious problems of ammonia leak increasing. So, when deciding the concentration of ammonia and catalyst, the impact of denitration unit must be considered.