Selective catalytic reduction of NO over W-Zr-O x /TiO 2 : performance study of hierarchical pore structure

A series of W-Zr-O /TiO catalysts with hierarchical pore structure were prepared and used for selective catalytic reduction of NO by NH . Results showed that the 5C-WZ/T had a hierarchical pore structure, and exhibited high catalytic activity and good resistance to water and sulfur poisoning. The ac...

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Bibliographic Details
Published in:RSC advances 2021-10, Vol.11 (53), p.33361-33371
Main Authors: Jin, Qijie, Lu, Yao, Ji, Wenyu, Yang, Bo, Xu, Mutao, Xue, Zhiwei, Dai, Yi, Xu, Haitao
Format: Article
Language:English
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Summary:A series of W-Zr-O /TiO catalysts with hierarchical pore structure were prepared and used for selective catalytic reduction of NO by NH . Results showed that the 5C-WZ/T had a hierarchical pore structure, and exhibited high catalytic activity and good resistance to water and sulfur poisoning. The activity of the 5C-WZ/T catalyst was close to 100% in the range of 350-500 °C. The hierarchical pore structure not only improved the specific surface area, redox performance, and acid quantity, but also enabled the catalyst to expose more active sites and improved the catalytic performance. Although the reducing atmosphere caused by citric acid monohydrate reduced the chemical adsorption oxygen concentration, it increased the oxygen mobility and Ti ion concentration, which was more conducive to the improvement of catalytic activity. Finally, the NH -SCR reaction over 5C-WZ/T catalyst followed L-H and E-R mechanisms. The monodentate nitrite, bidentate nitrate, gas-phase NO , coordinated NH and NH were the main reaction intermediates.
ISSN:2046-2069
2046-2069
DOI:10.1039/D1RA05801K