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

doi:10.1007/s11705-011-1167-z

Front Chem Sci Eng

2012, Vol. 6

Issue (1) : 38-46 https://doi.org/10.1007/s11705-011-1167-z

RESEARCH ARTICLE

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

Xuesong SHANG^1,2, Jianrong LI¹, Xiaowei YU¹, Jinsheng CHEN¹(

), Chi HE¹(

)

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

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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

Corresponding Author(s): CHEN Jinsheng,Email:jschen@iue.ac.cn; HE Chi,Email:che@iue.ac.cn

Issue Date: 05 March 2012

Cite this article:

Xuesong SHANG,Jianrong LI,Xiaowei YU, et al. Effective regeneration of thermally deactivated commercial V-W-Ti catalysts[J]. Front Chem Sci Eng, 2012, 6(1): 38-46.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-011-1167-z
https://academic.hep.com.cn/fcse/EN/Y2012/V6/I1/38

Fig.1 Experimental set-up for the evaluation of catalytic activity. 1. Mass flow controllers; 2. flue gas mixer; 3. preheater; 4. temperature control system; 5. reactor; 6. catalyst bed; 7. NH adsorption bottle; 8. flue gas analyzer; 9. bottles for tail gas treatment

Fig.2 X-ray diffraction of fresh, used and regenerated catalysts

Fig.3 SEM and TEM (insets) micrographs of all catalysts

Tab.1 Pore properties of fresh, used, and regenerated catalyst

Fig.4 N adsorption/desorption isotherms for samples. Inserts: pore size distribution calculated from N desorption branch of the gas sorption data

Fig.5 FT-IR spectra for used and regenerated catalyst

Tab.2 EDX elemental analysis of the fresh, used, and regenerated catalyst

Fig.6 NO conversion at different temperatures

Fig.7 Online record of NO conversion for samples at 350°C

Fig.8 Effect of oxygen concentration on catalytic activity

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