V2O5/hematite catalyst for low temperature selective catalytic reduction of NOx with NH3

doi:10.1016/S1872-2067(12)60719-0

Chinese Journal of Catalysis ›› 2014, Vol. 35 ›› Issue (1): 99-107.DOI: 10.1016/S1872-2067(12)60719-0

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V₂O₅/hematite catalyst for low temperature selective catalytic reduction of NO_x with NH₃

Ping Zhang, Tianhu Chen, Xuehua Zou, Chengzhu Zhu, Dong Chen, Haibo Liu

Laboratory of Nano Mineral and Environmental Material, School of Resource and Environmental Engineering, Hefei University of Technology, Hefei 230009, Anhui, China

Received:2013-04-28 Revised:2013-09-22 Online:2013-12-23 Published:2014-01-17
Contact: Tianhu Chen
Supported by:
This work was supported by the Specialized Research Fund for the Doctoral Program of Higher Education (20110111110003) and the National Natural Science Foundation of China (41130206).

Abstract

Abstract:

A series of V₂O₅/hematite (V/H) catalysts were prepared by impregnation of goethite with NH₄VO₃ solution and used in the selective catalytic reduction (SCR) of NO with NH₃. The catalysts were characterized by X-ray diffraction, transmission electron microscopy, N₂ adsorption, H₂ temperature-programmed reduction, and NH₃ temperature-programmed desorption. The effects of V₂O₅ loading and calcination temperature on the SCR activity were investigated. The NO conversion over 3% V/H catalysts calcined at 300℃ exceeded 95% at 250-300℃. Neither H₂O nor SO₂(0.01%) had any adverse impact on the activity, but a decrease of SCR activity was observed after high concentrations (0.03% and 0.05%) of SO₂ were introduced. Cutting off the SO₂ supply resulted in activity restoration. The simultaneous addition of 5% H₂O and 0.03% SO₂ led to a synergistic poisoning effect, but when these gases were switched off, the activity was recovered. SO₂ adsorption on the catalyst surface led to the decrease in SCR activity.

Key words: Iron oxide, Vanadic pentoxide, Nitrogen oxide, Selective catalytic reduction

Ping Zhang, Tianhu Chen, Xuehua Zou, Chengzhu Zhu, Dong Chen, Haibo Liu. V₂O₅/hematite catalyst for low temperature selective catalytic reduction of NO_x with NH₃[J]. Chinese Journal of Catalysis, 2014, 35(1): 99-107.

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V₂O₅/hematite catalyst for low temperature selective catalytic reduction of NO_x with NH₃

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