Abstract:
Sb-V
2O
5-TiO
2 catalysts were prepared by wet impregnation method. The effect of antimony loadings and calcination temperatures on the activity of catalysts were investigated on the basis of 3%V
2O
5-TiO
2. The results indicate that the catalyst with 11% Sb loading, calcined at 500℃, has the best activity of SCR. The NO
x conversion could reach 92% at 170℃ with the inlet NO
x concentration of 0.07%, the O
2 volume fraction of 5%, and the space velocity of 27 000 h
-1. The H
2-TPR data reveal that the increase of activity can be attributed to the promotion of the catalyst oxidation ability by the modifying of antimony. Sb is mainly in the pentavalent antimony form on the surface of the catalyst, and the increase in surface acidity of the catalyst is identified by means of XPS and NH
3-TPD. The effects of SO
2 and H
2O on the catalyst is also studied, showing that the Sb-V
2O
5-TiO
2 has an excellent catalytic activity in the presence of H
2O and SO
2. FT-IR, TG and pore structure test results suggest that the addition of Sb can effectively inhibit the aggregation of ammonium sulfate on the catalyst surface, thereby improving the service life of the catalyst.