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- Title
Enhancing N<sub>2</sub> Selectivity of V<sub>0.5</sub>/Pt<sub>0.04</sub>/TiO<sub>2</sub> Catalyst in NH<sub>3</sub>-SCO Reaction via Er Modification.
- Authors
Han, Zhitao; Gao, Yu; Tian, You; Zhou, Song; Pan, Xinxiang
- Abstract
The combination of noble metals and transition metal oxides is a feasible way to improve the catalytic performance of NH3-SCO catalysts, but it is still a great challenge to further promote N2 selectivity. Herein, the effects of various rare-earth element modification on comprehensive NH3-SCO performance of V0.5/Pt0.04/TiO2 catalyst (denoted as V/PT) were compared, and the results indicated that Er-modified V/PT catalyst exhibited superior low-temperature NH3 conversion performance and N2 selectivity over other catalysts. Er0.5V/PT catalyst achieved completely NH3 removal and > 80% of N2 selectivity in a wide temperature range of 225–450 °C. Furthermore, a series of characterization tools were performed to reveal the influence of Er modification on NH3-SCO performance of V/PT catalysts. The results indicated that Er element mainly acted as an acidity promoter in V/PT catalysts. The introduction of Er resulted in abundant Lewis acids sites and Brønsted acid sites on the surface of Er0.5V/PT catalyst, which might be ascribed to the formation of ErVO3 species. It was beneficial for both adsorption and activation of NH3, thus facilitating NH3-SCO reactions. The introduction of Er might also induce –NH2 species actively participated in internal SCR (i-SCR) reactions on the surface of Er0.5V/PT catalyst, which was favorable for N2 formation.
- Publication
Catalysis Letters, 2024, Vol 154, Issue 5, p2455
- ISSN
1011-372X
- Publication type
Article
- DOI
10.1007/s10562-023-04483-z