The Role of Lewis and Brønsted Acid Sites in NO Reduction with NH3 on Sulfur Modified TiO2-Supported V2O5 Catalyst


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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).

作者简介

Wei Zhao

School of Energy and Power Engineering

编辑信件的主要联系方式.
Email: wzhao@ujs.edu.cn
中国, Zhenjiang, 212013

Shengping Dou

School of Energy and Power Engineering

Email: wzhao@ujs.edu.cn
中国, Zhenjiang, 212013

Qin Zhong

School of Chemical Engineering

Email: wzhao@ujs.edu.cn
中国, Nanjing, 210094

Licheng Wu

School of Energy and Power Engineering

Email: wzhao@ujs.edu.cn
中国, Zhenjiang, 212013

Qian Wang

School of Energy and Power Engineering

Email: wzhao@ujs.edu.cn
中国, Zhenjiang, 212013

Aijian Wang

School of Energy and Power Engineering

Email: wzhao@ujs.edu.cn
中国, Zhenjiang, 212013

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