期刊
RSC ADVANCES
卷 2, 期 20, 页码 7906-7914出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ra20987j
关键词
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资金
- National Natural Science Foundation of China [51078185, U1162119]
- research fund of the Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province [AE201001]
- Research Fund for the Doctoral Program of Higher Education of China [20113219110009]
V2O5/TiO2 catalysts were prepared in the presence of (NH4)(2)TiF6 with controlled fluorine to titanium molar ratios (RF/Ti x 100) (0, 0.5, 1, 1.35 and 2) for selective catalytic reduction of nitrogen oxides (NOx) by NH3 (SCR process). It was found that the NOx conversion over F-doping V2O5/TiO2 was greatly improved compared with pure V2O5/TiO2. The effects of F-doping on the structure of the catalysts were systematically examined using XRD, Raman spectrum, BET, TEM, H-2-TPR, NO-TPD, XPS and EPR. The XPS results showed that F ions were incorporated into the TiO2 lattice. The high catalytic activity was ascribed to several beneficial effects produced by F-doping - preventing of grain growth, inhibiting of phase transformation from anatase to rutile, higher reducibility of good dispersion of vanadia species, creation of oxygen vacancies, and increasing active sites. It was interesting to point out that the better catalytic activity of F-doped V2O5/TiO2 was achieved by the creation of surface oxygen vacancies.
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