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Effective regeneration of thermally deactivated commercial V-W-Ti catalysts
Authors:Xuesong SHANG  Jianrong LI  Xiaowei YU  Jinsheng CHEN  Chi HE
Affiliation:1. Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; 2. College of Chemical Engineering, Huaqiao University, Xiamen 361021, China
Abstract:An effective method for the regeneration of thermally deactivated commercial monolith SCR catalysts was investigated. Two types of regenerated solutions, namely NH4Cl (1 mol/L) and dilute H2SO4 (0.5 mol/L), were employed to treat the used catalyst. The effects of temperature and the regeneration process on the structural and textural properties of the catalysts were determined by X-ray diffraction, scanning electron microscopy, N2 adsorption/desorption, elemental analysis and Fourier transform infrared spectroscopy. The results suggest that the anatase phase of the used catalyst is maintained after exposure to high temperatures. Some of the catalytic activity was restored after regeneration. The catalyst regenerated by aqueous NH4Cl had a higher activity than that of the catalyst treated by dilute H2SO4. The main reason is that the NH3 generated from the decomposition of NH4Cl at high temperatures can be adsorbed onto the catalyst which promotes the reaction. The aggregated V2O5 were partially re-dispersed during the regeneration process, and the intrinsic oxidation of ammonia with high concentrations of O2 is a factor that suppresses the catalytic activity.
Keywords:V2O5-WO3/TiO2 catalysts  thermal deactivation  regeneration  NH4Cl  dilute H2SO4 solution  
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