DeNO x performance enhancement of Cu-based oxides via employing a TiO2 phase to modify LDH precursors

Yali Du; Xuezhen Liu; Jiangning Liu; Rongting Du; Xu Wu

doi:10.1039/d2ra00316c

DeNO _x performance enhancement of Cu-based oxides via employing a TiO₂ phase to modify LDH precursors

RSC Adv. 2022 Mar 31;12(16):10142-10153. doi: 10.1039/d2ra00316c. eCollection 2022 Mar 25.

Authors

Yali Du¹, Xuezhen Liu^{1

2}, Jiangning Liu², Rongting Du², Xu Wu^{2

3}

Affiliations

¹ College of Chemistry and Chemical Engineering, Jinzhong University Jinzhong 030619 P. R. China.
² College of Chemistry and Chemical Engineering, Taiyuan University of Technology Taiyuan 030024 P. R. China wuxu@tyut.edu.cn +86-351-6018528 +86-351-6018528.
³ Shanxi Huadun Industrial Co., Ltd Taiyuan 030062 China.

Abstract

CuAl-LDO, CuAl-LDO/TiO₂ and CuAl-LDO/TiO₂NTs catalysts were obtained from TiO₂ modified LDHs precursor which were prepared by in situ assembly method. Then catalysts were evaluated in the selective catalytic reduction of NO _x with NH₃(NH₃-SCR), and the results showed that the CuAl-LDO/TiO₂NTs catalyst exhibited preferable deNO _x performance (more than 80% NO _x conversion and higher than 90% N₂ selectivity at a temperature range of 210-330 °C) as well as good SO₂ resistance. With the aid of series of characterizations such as XRD, N₂ adsorption/desorption, XPS, NH₃-TPD, H₂-TPR, and in situ DRIFTS, it could be concluded that, doping TiO₂NTs afforded the catalyst larger specific surface area, more abundant surface chemisorption oxygen species and more excellent redox performance. Meanwhile, In situ DRIFTS evidenced that CuAl-LDO/TiO₂NTs catalyst has a strong adsorption capacity for the reaction gas, which is more conducive to the progress of the SCR reaction.