Citation: Hui Wang, Ting Zhu, Yujie Qiao, Shicheng Dong, Zhenping Qu. Investigation of the promotion effect of Mo doped CuO catalysts for the low-temperature performance of NH₃-SCR reaction[J]. Chinese Chemical Letters, ;2022, 33(12): 5223-5227. doi: 10.1016/j.cclet.2022.01.075 shu

Investigation of the promotion effect of Mo doped CuO catalysts for the low-temperature performance of NH₃-SCR reaction

Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China

quzhenping@dlut.edu.cn

Received Date: 27 September 2021
Revised Date: 3 December 2021
Accepted Date: 27 January 2022
Available Online: 3 February 2022

Figures(4)

A novel Mo-doped CuO catalyst is developed and used for low-temperature NH₃-SCR reaction. Compared with the undoped CuO sample, the Mo doped CuO catalyst shows an increased SCR performance with above 80% NO_x conversion at 175 ℃. The XRD and Raman results have confirmed the incorporation of Mo metal ions into CuO lattice to form Mo-O-Cu species which may be related to the enhanced SCR activity. The XPS and UV–vis results reveal the creation of electron interaction between Cu and Mo in this Mo-O-Cu system which provides an increased amount of Lewis and Brønsted acid sites, thereby promoting the adsorption capacity of NH₃ and NO_x as verified by NH₃-TPD and NO_x-TPD characterization. Besides, it also promotes the formation of oxygen vacancies, leading to the increasing of chemisorbed oxygen species, which improves the NO oxidation to NO₂ activity. Furthermore, in situ DRIFTS technology was also used to study the reaction mechanism of this Mo doped CuO catalyst. The formed NO₂ could react with NH_x (x = 3, 2) species to enhance the low-temperature NH₃-SCR activity via the "fast-SCR" reaction pathway. The nitrate and nitrite ad-species may react with NH₃ and NH₄⁺ ad-species through the L-H pathway.
- Mo doped CuO,
- NH₃-SCR,
- NO_x,
- Solid solution,
- Low-temperature,
- Reaction mechanism
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沈阳化工大学材料科学与工程学院沈阳 110142

Investigation of the promotion effect of Mo doped CuO catalysts for the low-temperature performance of NH3-SCR reaction

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通讯作者: 陈斌, bchen63@163.com

Investigation of the promotion effect of Mo doped CuO catalysts for the low-temperature performance of NH₃-SCR reaction