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Performance and characterisation of CeO2–TiO2–WO3 catalysts for selective catalytic reduction of NO with NH3

Hao Li, Guang-Fei Qu, Yan-Kang Duan, Ping Ning, Qiu-Lin Zhang, Xin Liu, and Zhong-Xian Song

Faculty of Environmental Science and Engineering, Kunming University of Science and Technology. Kunming, 650500, China

 

E-mail: qiulinzhang_kmust@163.com

Abstract: Ce-Ti-W-Ox catalysts were prepared and applied to the NH3-selective catalytic reduction (SCR) reaction. The experimental results showed that the Ce-Ti-W-Ox catalyst prepared by the hydrothermal method exhibited higher NO conversion than those synthesised via the sol-gel and impregnating methods, while the optimal content of WO3 and molar ratio of Ce/Ti were 20 mass % and 4 : 6, respectively. Under these conditions, the catalyst exhibited the highest level of catalytic activity (the NO conversion reached values higher than 90 %) across a wide temperature range of 225-450◦C, with a range of gas hourly space velocity (GHSV) of 40000-140000 h−1. The catalyst also exhibited good resistance to H2O and SO2. The influences of morphology, phase structure, and surface properties on the catalytic performance were investigated by N2 adsorption-desorption measurement, XRD, XPS, H2-TPR, and SEM. It was found that the high efficiency of NO removal was due to the large BET surface area, the amorphous surface species, the change to element valence states, and the strong interaction between Ce, Ti, and W.

Keywords: selective catalytic reduction – Ce-Ti-W-Ox – hydrothermal method – strong interaction

Full paper is available at www.springerlink.com.

DOI: 10.1515/chempap-2015-0082

 

Chemical Papers 69 (6) 817–826 (2015)

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