DRIFT Study on Promotion Effect of the Keggin Structure over V2O5-MoO3/TiO2 Catalysts for Low Temperature NH3-SCR Reaction

DRIFT Study on Promotion Effect of the Keggin Structure over V2O5-MoO3/TiO2 Catalysts for Low Temperature NH3-SCR Reaction

Heteropoly acids (HPAs) with the Keggin structure have been widely used in NOx removal. Two kinds of catalysts (those with and without the Keggin structure) are prepared for studying the effect of the Keggin structure on the NH3-SCR reaction. A series of in situ diffuse reflectance infrared Fourier...

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Main Authors: Rui Wu, Ningqiang Zhang, Lingcong Li, Hong He, Liyun Song, Wenge Qiu
Format: Article
Language:English
Published: MDPI AG 2018-04-01
Series:Catalysts
Subjects:
NH3-SCR
in situ DRIFT
Keggin structure
surface adsorption
Online Access:http://www.mdpi.com/2073-4344/8/4/143
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spelling doaj-cf8882864cba4b95b25d2378b3b0e83d2020-11-24T20:59:23ZengMDPI AGCatalysts2073-43442018-04-018414310.3390/catal8040143catal8040143DRIFT Study on Promotion Effect of the Keggin Structure over V2O5-MoO3/TiO2 Catalysts for Low Temperature NH3-SCR ReactionRui Wu0Ningqiang Zhang1Lingcong Li2Hong He3Liyun Song4Wenge Qiu5Laboratory of Catalysis Chemistry and Nanoscience, Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, ChinaLaboratory of Catalysis Chemistry and Nanoscience, Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, ChinaLaboratory of Catalysis Chemistry and Nanoscience, Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, ChinaLaboratory of Catalysis Chemistry and Nanoscience, Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, ChinaLaboratory of Catalysis Chemistry and Nanoscience, Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, ChinaLaboratory of Catalysis Chemistry and Nanoscience, Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, ChinaHeteropoly acids (HPAs) with the Keggin structure have been widely used in NOx removal. Two kinds of catalysts (those with and without the Keggin structure) are prepared for studying the effect of the Keggin structure on the NH3-SCR reaction. A series of in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFT) analyses are conducted to investigate the surface-adsorbed species on the catalysts during the SCR reaction. The mechanism for enhancing low-temperature activity of the catalysts is proposed. Furthermore, the effect of NH4+ in the Keggin structure is also investigated. Results indicate that both the Langmuir–Hinshelwood (L-H) and Eley–Rideal (E-R) mechanisms occurred in the NH3-SCR reaction over the catalyst with the Keggin structure (Cat-A); in addition, when more acid sites are provided, NOx species activity is improved and more NH4+ ions participate in reaction over Cat-A, thus promoting SCR activity.http://www.mdpi.com/2073-4344/8/4/143NH3-SCRin situ DRIFTKeggin structuresurface adsorption
collection DOAJ
language English
format Article
sources DOAJ
author Rui Wu
Ningqiang Zhang
Lingcong Li
Hong He
Liyun Song
Wenge Qiu
spellingShingle Rui Wu
Ningqiang Zhang
Lingcong Li
Hong He
Liyun Song
Wenge Qiu
DRIFT Study on Promotion Effect of the Keggin Structure over V2O5-MoO3/TiO2 Catalysts for Low Temperature NH3-SCR Reaction
Catalysts
NH3-SCR
in situ DRIFT
Keggin structure
surface adsorption
author_facet Rui Wu
Ningqiang Zhang
Lingcong Li
Hong He
Liyun Song
Wenge Qiu
author_sort Rui Wu
title DRIFT Study on Promotion Effect of the Keggin Structure over V2O5-MoO3/TiO2 Catalysts for Low Temperature NH3-SCR Reaction
title_short DRIFT Study on Promotion Effect of the Keggin Structure over V2O5-MoO3/TiO2 Catalysts for Low Temperature NH3-SCR Reaction
title_full DRIFT Study on Promotion Effect of the Keggin Structure over V2O5-MoO3/TiO2 Catalysts for Low Temperature NH3-SCR Reaction
title_fullStr DRIFT Study on Promotion Effect of the Keggin Structure over V2O5-MoO3/TiO2 Catalysts for Low Temperature NH3-SCR Reaction
title_full_unstemmed DRIFT Study on Promotion Effect of the Keggin Structure over V2O5-MoO3/TiO2 Catalysts for Low Temperature NH3-SCR Reaction
title_sort drift study on promotion effect of the keggin structure over v2o5-moo3/tio2 catalysts for low temperature nh3-scr reaction
publisher MDPI AG
series Catalysts
issn 2073-4344
publishDate 2018-04-01
description Heteropoly acids (HPAs) with the Keggin structure have been widely used in NOx removal. Two kinds of catalysts (those with and without the Keggin structure) are prepared for studying the effect of the Keggin structure on the NH3-SCR reaction. A series of in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFT) analyses are conducted to investigate the surface-adsorbed species on the catalysts during the SCR reaction. The mechanism for enhancing low-temperature activity of the catalysts is proposed. Furthermore, the effect of NH4+ in the Keggin structure is also investigated. Results indicate that both the Langmuir–Hinshelwood (L-H) and Eley–Rideal (E-R) mechanisms occurred in the NH3-SCR reaction over the catalyst with the Keggin structure (Cat-A); in addition, when more acid sites are provided, NOx species activity is improved and more NH4+ ions participate in reaction over Cat-A, thus promoting SCR activity.
topic NH3-SCR
in situ DRIFT
Keggin structure
surface adsorption
url http://www.mdpi.com/2073-4344/8/4/143
work_keys_str_mv AT ruiwu driftstudyonpromotioneffectofthekegginstructureoverv2o5moo3tio2catalystsforlowtemperaturenh3scrreaction
AT ningqiangzhang driftstudyonpromotioneffectofthekegginstructureoverv2o5moo3tio2catalystsforlowtemperaturenh3scrreaction
AT lingcongli driftstudyonpromotioneffectofthekegginstructureoverv2o5moo3tio2catalystsforlowtemperaturenh3scrreaction
AT honghe driftstudyonpromotioneffectofthekegginstructureoverv2o5moo3tio2catalystsforlowtemperaturenh3scrreaction
AT liyunsong driftstudyonpromotioneffectofthekegginstructureoverv2o5moo3tio2catalystsforlowtemperaturenh3scrreaction
AT wengeqiu driftstudyonpromotioneffectofthekegginstructureoverv2o5moo3tio2catalystsforlowtemperaturenh3scrreaction
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