Regeneration process of the SCR catalyst was investigated. Several methods such as the X-ray diffraction( XRD)

X-ray fluorescence( XRF)

X-ray photoelectron spectroscopy( XPS) and specific surface area analysis were employed to characterize the catalysts before and after the regeneration. Moreover

the regeneration effect was also tested on a laboratory bench with simulated flue gas. The results show that

cleaning using aeration or ultrasonic assisted dilute sulfuric acid was proved to be effective in eliminating the poisons and recovering the specific surface area

and the aeration way performed better. With the aid of cosolvent ethanolamine

ammonium vanadate aqueous solutions with different concentrations could be obtained and used as precursors for active material replenishment.After drying and calcination

the catalysts were replenished with vanadium oxide

and the NO conversion ratio could reach up to 92%. Cerium nitrate was an alternative for ammonium vanadate because of its excellent solubility in water. After the impregnating-drying-calcining process

the catalyst was regenerated with cerium oxide

thus the temperature window was extended and the NO conversion ratio was enhanced to 90% at most.