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Open AccessArticle

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

1,†, 1,†, 1, 1,2,*, 1,* and 1
Laboratory of Catalysis Chemistry and Nanoscience, Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing 100081, China
Authors to whom correspondence should be addressed.
These authors contributed equally.
Catalysts 2018, 8(4), 143;
Received: 10 March 2018 / Revised: 30 March 2018 / Accepted: 30 March 2018 / Published: 3 April 2018
(This article belongs to the Special Issue Selective Catalytic Reduction of NOx)
PDF [23788 KB, uploaded 3 May 2018]


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. View Full-Text
Keywords: NH3-SCR; in situ DRIFT; Keggin structure; surface adsorption NH3-SCR; in situ DRIFT; Keggin structure; surface adsorption

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Wu, R.; Zhang, N.; Li, L.; He, H.; Song, L.; Qiu, W. DRIFT Study on Promotion Effect of the Keggin Structure over V2O5-MoO3/TiO2 Catalysts for Low Temperature NH3-SCR Reaction. Catalysts 2018, 8, 143.

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