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Frontiers of Environmental Science & Engineering

ISSN 2095-2201

ISSN 2095-221X(Online)

CN 10-1013/X

Postal Subscription Code 80-973

2018 Impact Factor: 3.883

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Front Envir Sci Eng    2012, Vol. 6 Issue (2) : 156-161    https://doi.org/10.1007/s11783-010-0295-x
RESEARCH ARTICLE
Characterization and performance of V2O5/CeO2 for NH3-SCR of NO at low temperatures
Caiting LI(), Qun LI, Pei LU, Huafei CUI, Guangming ZENG
Key Laboratory of Environmental Biology and Pollution Control (Ministry of Education), College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
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Abstract

A series of CeO2 supported V2O5 catalysts with various loadings were prepared with different calcination temperatures by the incipient impregnation. The catalysts were evaluated for low temperature selective catalytic reduction (SCR) of NO with ammonia (NH3). The effects of O2 and SO2 on catalytic activity were also studied. The catalysts were characterized by specific surface areas (SBET) and X–ray diffraction (XRD) methods. The experimental results showed that NO conversion changed significantly with the different V2O5 loading and calcination temperature. With the V2O5 loading increasing from 0 to 10 wt%, NO conversion increased significantly, but decreased at higher loading. The optimum calcination temperature was 400°C. The best catalyst yielded above 80% NO conversion in the reaction temperature range of 160°C–300°C. The formation of CeVO4 on the surface of catalysts caused the decrease of redox ability.
Keywords V2O5/CeO2 catalysts      NH3-SCR (selective catalytic reduction)      the incipient impregnation      low temperatures     
Corresponding Author(s): LI Caiting,Email:ctli@hnu.cn   
Issue Date: 01 April 2012
 Cite this article:   
Caiting LI,Qun LI,Pei LU, et al. Characterization and performance of V2O5/CeO2 for NH3-SCR of NO at low temperatures[J]. Front Envir Sci Eng, 2012, 6(2): 156-161.
 URL:  
https://academic.hep.com.cn/fese/EN/10.1007/s11783-010-0295-x
https://academic.hep.com.cn/fese/EN/Y2012/V6/I2/156
catalystsSBET /(m2·g-1)
CeO283
V2O515
1%V2O5/CeO2(400°C)80
5%V2O5/CeO2(400°C)72
10%V2O5/CeO2(400°C)56
15%V2O5/CeO2(400°C)53
20%V2O5/CeO2(400°C)48
5%V2O5/CeO2(500°C)60
5%V2O5/CeO2(600°C)43
Tab.1  Specific surface area of the catalysts
Fig.1  XRD patterns of the VO/CeO (400°C) catalyst with various VO contents
(a) Pure CeO; (b) 1% VO/CeO; (c) 5% VO/CeO; (d) 10% VO/CeO; (e) 15% VO/CeO; (f) 20% VO/CeO.
Fig.2  XRD patterns of the 5%VO/CeO catalyst at different calcination temperatures:
(a) 5%VO/CeO (400°C); (b) 5%VO/CeO (500°C); (c) 5%VO/CeO (600°C)
Fig.3  NO conversion of the VO/CeO catalyst with various VO loadings calcined at 400°C.Reaction conditions: 500 mg catalyst, total flow 100 mL·min, NO 1×10, NH 1.08×10, O 5 vol%, N balance
Fig.4  NO conversion of the 5%VO/CeO catalyst calcined at 400°C, 500°C, 600°C.
Reaction conditions: 500 mg catalyst, NO 1×10, NH1.08×10, O 5 vol%, N balance, total flow 100 mL·min
Fig.5  NO conversion of the 5%VO/CeO catalyst under different reaction conditions: in the presence of O and in the absence of O. Reaction conditions: 500 mg catalyst, NO 1×10, NH 1.08×10, O 0-5 vol%, N balance, total flow 100 mL·min
Fig.6  NO conversion on 5%VO/CeO catalyst under different reaction conditions: in the presence of SO and in the absence of SO. Reaction conditions: 500 mg catalyst, NO 1×10, NH 1.08×10, SO 0-3vol%, N balance, total flow 100 mL·min
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