Simultaneous removal of NOx and chlorobenzene on V2O5/TiO2 granular catalyst: Kinetic study and performance prediction

doi:10.1007/s11783-020-1363-5

Front. Environ. Sci. Eng.

2021, Vol. 15

Issue (4) : 70 https://doi.org/10.1007/s11783-020-1363-5

RESEARCH ARTICLE

Simultaneous removal of NO_x and chlorobenzene on V₂O₅/TiO₂ granular catalyst: Kinetic study and performance prediction

Lina Gan¹, Kezhi Li², Hejingying Niu³(

), Yue Peng⁴, Jianjun Chen⁴(

), Yuandong Huang¹, Junhua Li⁴

¹. School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
². Institute of Engineering Technology, Sinopec Catalyst Co., Ltd., Beijing 101111, China
³. School of Environmental & Chemical Engineering, Shanghai University, Shanghai 200444, China
⁴. School of Environment, Tsinghua University, Beijing 100084, China

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Abstract

• A V₂O₅/TiO₂ granular catalyst for simultaneous removal of NO and chlorobenzene.

• Catalyst synthesized by vanadyl acetylacetonate showed good activity and stability.

• The kinetic model was established and the synergetic activity was predicted.

• Both chlorobenzene oxidation and SCR of NO follow pseudo-first-order kinetics.

• The work is of much value to design of multi-pollutants emission control system.

The synergetic abatement of multi-pollutants is one of the development trends of flue gas pollution control technology, which is still in the initial stage and facing many challenges. We developed a V₂O₅/TiO₂ granular catalyst and established the kinetic model for the simultaneous removal of NO and chlorobenzene (i.e., an important precursor of dioxins). The granular catalyst synthesized using vanadyl acetylacetonate precursor showed good synergistic catalytic performance and stability. Although the SCR reaction of NO and the oxidation reaction of chlorobenzene mutually inhibited, the reaction order of each reaction was not considerably affected, and the pseudo-first-order reaction kinetics was still followed. The performance prediction of this work is of much value to the understanding and reasonable design of a catalytic system for multi-pollutants (i.e., NO and dioxins) emission control.

Keywords NO_x Chlorobenzene Simultaneous removal Kinetic study Performance prediction V₂O₅/TiO₂ Graphical abstract

Corresponding Author(s): Hejingying Niu,Jianjun Chen

Issue Date: 10 November 2020

Cite this article:

Lina Gan,Kezhi Li,Hejingying Niu, et al. Simultaneous removal of NO_x and chlorobenzene on V₂O₅/TiO₂ granular catalyst: Kinetic study and performance prediction[J]. Front. Environ. Sci. Eng., 2021, 15(4): 70.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-020-1363-5
https://academic.hep.com.cn/fese/EN/Y2021/V15/I4/70

Fig.1 (a) NO and CB conversions, and (b) the selectivity of N₂ and CO_x of the NH₄VO₃-VTi and VO(acac)₂-VTi granular catalysts. Reaction conditions: NO 500 mg/L, CB 50 mg/L, NH₃ 500 mg/L, O₂ 10 vol.%, N₂ as balance gas, GHSV 60,000 mL/(g?h).

Fig.2 The stability test of NH₄VO₃-VTi and VO(acac)₂-VTi granular catalysts at 350 °C (a) without and (b) with 10 vol.% H₂O. Reaction conditions: NO 500 mg/L, CB 50 mg/L, NH₃ 500 mg/L, O₂ 10 vol.%, H₂O 10 vol.% (when used), N₂ as balance gas, GHSV 60,000 mL/(g?h).

Tab.1 The physical, chemical and surface properties of the catalysts

Fig.3 (a) V 2p and (b) O 1s XPS spectra of the NH₄VO₃-VTi and VO(acac)₂-VTi granular catalysts.

Fig.4 (a) H₂-TPR profiles and (b) Arrhenius plots of the rate of H₂ consumption versus inverse temperature of the NH₄VO₃-VTi and VO(acac)₂-VTi catalysts from 100°C?1000 °C.

Tab.2 Kinetic parameters for NO and CB conversion.

Fig.5 Dependences of NO_x conversion rate on NO concentration (a) and (c) without CB, (b) and (d) with CB. Reaction conditions: NO 200-500 mg/L, CB 50 mg/L (when used), NH₃ 500 mg/L, O₂ 10 vol.%, N₂ as balance gas, GHSV 240,000?960,000 mL/(g?h).

Fig.6 (a) Experimental and predicted NO conversion at different temperatures, (b) the response surface and (c) contour map of NO conversion as a function of temperature and space velocity.

Fig.7 Experimental and predicted CB conversion at different temperatures, (b) the response surface and (c) contour map of CB conversion as a function of temperature and space velocity.

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