Currently, SCR denitration catalyst, the key to the denitration reaction, is the main technology to eliminate pollution of stationary source NOx, has the advantages of high efficiency, selectivity and economic. It is found that vanadium-based denitration catalyst with anatase titanium dioxide has the higher activity, selectivity, stability after many years of industrial experience; besides, it shows strong in anti-toxic effects from sulfur dioxide, fly ash, alkali metals and arsenic when tungsten trioxide added, which makes it an ideal denitration catalyst and widely used.

 

Technical grade titania carrier can load limit active ingredient, however, if the specific surface area reduced, its load capacity can be greatly enhanced under quality fixed. In order to increase the specific surface area of titanium dioxide, scholars are constantly studied, there are sol-gel, supercritical drying and supercritical fluid extraction method, however, they can not be mass-produced due to the lacking of complicated operation and high cost. This paper presents an ammonia titration titanyl sulfate precipitation method to produce porous titanium dioxide, and prepare SCR denitration catalyst by impregnation.

 

The steps like bellows:

1.Completely dissolve titanyl sulfate in water, add the appropriate amount of ammonia after stirring sufficiently to generate a large amount of precipitate, then set the precipitate at room temperature for 10 hours;

2.Filtering, washing, and then drying for 10 hours, turning to a muffle furnace for calcining at 550 °C for 3 hours, then cames to the porous titanium dioxide, ground;

3.Dissolving tungstate ammonia and ammonium metatungstate in the oxalic acid solution;

4.Dipping the titanium dioxide into the solution configured, then drying after respectively stirring and aging for 1hour, and calcining in a muffle furnace at 550 °C for 6 hours, ground to 20 to 30 mesh to obtain the porous titanium oxide V2O5-WO3 SCR denitration catalyst.