The Role of Lewis and Brønsted Acid Sites in NO Reduction with NH3 on Sulfur Modified TiO2-Supported V2O5 Catalyst
- Authors: Zhao W.1, Dou S.1, Zhong Q.2, Wu L.1, Wang Q.1, Wang A.1
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Affiliations:
- School of Energy and Power Engineering
- School of Chemical Engineering
- Issue: Vol 91, No 13 (2017)
- Pages: 2489-2494
- Section: Chemical Kinetics and Catalysis
- URL: https://journals.rcsi.science/0036-0244/article/view/169819
- DOI: https://doi.org/10.1134/S003602441713026X
- ID: 169819
Cite item
Abstract
V2O5/S-doped TiO2 was prepared by the sol-gel and impregnation methods. The adsorption of NO, NH3, and O2 over the catalyst was studied by in situ DRIFTS spectroscopy to elucidate the reaction mechanism of the low-temperature selective catalytic reduction of NO with NH3. Exposing the catalyst to O2 and NO, three types of nitrates species appeared on the surface. The introduction of S to TiO2 could generate large amounts of acid sites for ammonia adsorption on the catalyst, which was believed to be an important role in the SCR reaction and hereby improved the catalytic activity. The results indicated two possible SCR reaction pathways for catalyst. One was that NO was absorbed to form nitrite species, which could react with NH3 on Lewis acid sites, producing N2 and H2O. Another way was that NH3 was adsorbed, then reacted with gas phase NO (E–R) and nitrite intermediates on the surface (L–H).
Keywords
About the authors
Wei Zhao
School of Energy and Power Engineering
Author for correspondence.
Email: wzhao@ujs.edu.cn
China, Zhenjiang, 212013
Shengping Dou
School of Energy and Power Engineering
Email: wzhao@ujs.edu.cn
China, Zhenjiang, 212013
Qin Zhong
School of Chemical Engineering
Email: wzhao@ujs.edu.cn
China, Nanjing, 210094
Licheng Wu
School of Energy and Power Engineering
Email: wzhao@ujs.edu.cn
China, Zhenjiang, 212013
Qian Wang
School of Energy and Power Engineering
Email: wzhao@ujs.edu.cn
China, Zhenjiang, 212013
Aijian Wang
School of Energy and Power Engineering
Email: wzhao@ujs.edu.cn
China, Zhenjiang, 212013