Effective regeneration of thermally deactivated commercial V-W-Ti catalysts

Xuesong SHANG, Jianrong LI, Xiaowei YU, Jinsheng CHEN, Chi HE

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PDF(717 KB)
Front. Chem. Sci. Eng. ›› 2012, Vol. 6 ›› Issue (1) : 38-46. DOI: 10.1007/s11705-011-1167-z
RESEARCH ARTICLE

Effective regeneration of thermally deactivated commercial V-W-Ti catalysts

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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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Xuesong SHANG, Jianrong LI, Xiaowei YU, Jinsheng CHEN, Chi HE. Effective regeneration of thermally deactivated commercial V-W-Ti catalysts. Front Chem Sci Eng, 2012, 6(1): 38‒46 https://doi.org/10.1007/s11705-011-1167-z

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Acknowledgments

This research was financially supported by the National Key Technology Program of China (Grant No. 2008BAC32B03) and the Science Foundation of the Fujian Province (No. 2011J01060).

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg
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