Promotional effect of Si-doped V2O5/TiO2 for selective catalytic reduction of NOx by NH3
Yanxiao Pan , Wei Zhao , Qin Zhong
,
Wei Cai
,
Hongyu Li
DOI:10.1016/S1001-0742(12)60181-8
Received October 11, 2012,Revised February 26, 2013, Accepted , Available online August 03, 2013
Volume ,2013,Pages 1703-1711
TiO2 supports doped with different amounts of Si were prepared by a sol-gel method, and 1 wt% vanadia (V2O5) loaded on Si-doped TiO2 was obtained by an impregnation method. The mole ratio of Si/Ti was 0.2, NOx conversion exceeds 94% at 300celsius and GHSV of 41,324 hr-1, which is about 20% higher than pure V2O5/TiO2. The catalysts were characterized by XRD, BET, TEM, FT-IR, NH3-TPD, XPS, H2-TPR, Raman and in situ DRIFTS. The results of FT-IR and XPS indicated that Si was doped into the TiO2 lattice successfully and a solid solution was obtained. V2O5 active component could be dispersed well on the support with the increasing of surface area of the catalyst, which was confirmed by Raman and XRD results. Above all, the numbers of acid sites (especially the Bronsted-acid) and oxidation properties were enhanced for Si-doped V2O5/TiO2 catalysts, which improved the deNOx catalytic activity.
