The carrier has a significant impact on the property of SCR denitration catalyst. Currently, alumina, silica, zeolite, etc. are the most commonly used catalyst carriers, titanium dioxide has been greatly concerned because of its strong acidity. However, single vector is difficult to meet all the needs of modern industry, therefore, people began to study the composite carriers to set the advantages of both in one, also, it is expected that new property will be found by the interaction of two carriers.

 

Tungsten trioxide, vanadium pentoxide and other active components loaded in titanium dioxide-aluminum oxide can effectively improve the activity and selectivity of the SCR denitration catalyst.Titanium dioxide-aluminum oxide composite carrier can be prepared by different methods, like impregnation, grafting, adsorption and other method, also different methods will have greatly effect on titanium dioxide desperate on aluminum oxide.

 

The introduction of tungsten trioxide can effectively improve the activity of vanadium system SCR denitration catalyst and also enhance its hydrothermal stability. Further more, the catalyst powder will have bigger specific surface area when using nanotechnology, thus to greatly enhance the activity of the catalyst, making the catalyst has a stronger catalytic reduction.

 

Experimental studies have proved that with the increasing of aluminum content, the vanadium pentoxide-tungsten trioxide/titania-based SCR denitration catalyst reactivity will gradually increasing. This indicates that the synergy of titanium oxide and aluminum trioxide can enhance the activity of catalyst. Especially, when the aluminum content is 10% and at the temperature of 380 °C, the denitration catalyst has a high activity which is reach to 98.6%, significantly higher than single titania-supported catalysts. Thus to conclusion that aluminum oxide improves tungsten trioxide SCR denitration catalyst activity.