V 2 O 5 -WO 3 /TiO 2 catalysts were synthesized from waste selective catalytic reduction (SCR) catalyst through oxalic acid leaching and impregnating with various V 2 O 5 mass loadings. The denitration (deNO x ) activity and physiochemical properties of the catalysts were investigated. All the catalysts were characterized by N 2 adsorption/desorption, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and H 2 -temperature programmed reduction. The evaluation result revealed that the deNO x activity of newly synthesized catalyst with 1.0% V 2 O 5 was almost recovered to the level of fresh catalyst, with NO conversion being recovered to 91% at 300 • C, and it also showed a good resistance to SO 2 and H 2 O. The characterization results showed that the decrease of impurities, partial recovery of the V 4+ /V 5+ ratio, and increased reducibility were mainly responsible for the recovery of catalytic activity.

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