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

• Published in: Chemical papers Vol. 69; no. 6; pp. 817 - 826
• Main Authors: Li, Hao, Qu, Guang-Fei, Duan, Yan-Kang, Ning, Ping, Zhang, Qiu-Lin, Liu, Xin, Song, Zhong-Xian
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.06.2015; De Gruyter Open
• Subjects: Biochemistry; Biotechnology; Ce-Ti-W-Ox; Chemistry; Chemistry and Materials Science; Chemistry/Food Science; hydrothermal method; Industrial Chemistry/Chemical Engineering; Materials Science; Medicinal Chemistry; Original Paper; selective catalytic reduction; strong interaction; Ce-Ti-W-O; selective catalytic reduction; strong interaction; hydrothermal method
• ISSN: 0366-6352; 1336-9075
• DOI: 10.1515/chempap-2015-0082

Ce-Ti-W-O x catalysts were prepared and applied to the NH 3 -selective catalytic reduction (SCR) reaction. The experimental results showed that the Ce-Ti-W-O x 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 WO 3 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 H 2 O and SO 2 . The influences of morphology, phase structure, and surface properties on the catalytic performance were investigated by N 2 adsorption-desorption measurement, XRD, XPS, H 2 -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.