Abstract
A series of Sb-doped CeVO4 samples were synthetized by hydrothermal method and used in selective catalytic reduction of NO with NH3. Contrasted with other catalysts, Sb2CeVO4 possessed superior NH3-SCR activity and excellent SO2 tolerance. Besides, the characterization results testified that Sb species in Sb2CeVO4 could reduce the crystallization of CeVO4, and improve the surface acidity and reducibility. Moreover, the existence of Sb3+ was beneficial to generate more surface adsorbed oxygen species. Based on the in situ DRIFT spectra, more ad-NH3 and ad-NOx species with higher reactivity were obtainable on Sb2CeVO4 catalyst compared with that on CeVO4 catalyst, which also contributed to enhancing the SCR activity by Langmuir-Hinshelwood (L-H) mechanism effectively.
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