Study on adsorption of NO and NH_3 on VPO/TiO_2 catalysts by DFT simulation
Journal Title: Energy Environmental Protection - Year 2023, Vol 37, Issue 4
Abstract
Nitrogen oxides (NO_x), as one of the main atmospheric pollutants, seriously affect environmental safety and human health. Selective catalytic reduction (NH_3-SCR) is the most effective treatment method for NO_x removal at present, especially low-temperature SCR denitrification technology, which has very important application prospects and research significance. The research showed that VPO/TiO_2 catalyst had excellent low-temperature SCR denitrification activity. The adsorption of NH_3 and NO on V_2O_5 and (VO)_2P_2O_7 surface was simulated by DFT, and the reaction mechanism of VPO catalyst was studied at the micro level. The results showed that NH_3 exhibited stable chemisorption of Brønsted acid and Lewis acid on the surface of V_4P_4O_22H_14 cluster, and the adsorption effect on Brønsted acid sites was more stable. NH_3 adsorption effect on the surface of catalyst was excellent because of the hybridization of 2p orbital of N, 2p of O and 3d electron orbital of V. NO also showed chemisorption on the surface of V_4P_4O_22H_14 cluster. Due to the small amount of electron transfer, which was significantly lower than the adsorption energy of NH_3, NO could not strongly compete with NH_3 molecule. In addition, NO showed stable chemisorption on Brønsted acid and Lewis acid on the surface of V_6O_20H_10 cluster. The adsorption on Brønsted acid sites was more stable. The E-R mechanism and L-H mechanism of VPO/TiO_2 catalyst reaction mechanism were explained.
Authors and Affiliations
LI Liusheng|Guangxi Iron & Steel Group Co., Ltd., China, XU Bin|School of Energy and Environment, Anhui University of Technology, China, ZHANG Ming|School of Energy and Environment, Anhui University of Technology, China, ZHANG Jiahao|School of Energy and Environment, Anhui University of Technology, China, CHEN Yafen|School of Energy and Environment, Anhui University of Technology, China, SONG Ci|School of Energy and Environment, Anhui University of Technology, China, GUO Lina|School of Energy and Environment, Anhui University of Technology, China, CHUN Tiejun|School of Metallurgical Engineering, Anhui University of Technology, China, JIA Yong*|School of Energy and Environment, Anhui University of Technology, China
Keywords
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- EP ID EP737992
- DOI 10.20078/j.eep.20230401
- Views 30
- Downloads 0
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