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A series of cobalt doped TiO2 (Co-TiO2) and CoOx loaded TiO2 (Co/TiO2) catalysts prepared by sol-gel and impregnation methods respectively were investigated on selective catalytic reduction with NH3 (NH3-SCR) of NO.It was found that Co-TiO2 catalyst showed more preferable catalytic activity at low temperature range.From characterization results of XRD,TEM,Raman and FT-IR,Co species were proved to be doped into TiO2 lattice by replaced Ti atoms.After being characterized and analyzed by NH3-TPD,PL,XPS,EPR and DRIFTS,it was found that the better NH3-SCR activities of Co-TiO2 catalysts,compared with Co/TiO2 catalyst,were ascribed to the formation of more oxygen vacancies which further promoted the production of more superoxide ions (O2-).The superoxide ions were crucial for the formation of low temperature SCR reaction intermediates (NO3-) by reacting with adsorbed NO molecule.Therefore,these aspects were responsible for the higher low temperature NH3-SCR activity of Co-TiO2 catalysts.