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Doping effect of rare earth metal ions Sm3+, Nd3+and Ce4+on denitration performance of MnOx catalyst in low temperature NH3-SCR reaction*
Rong, Jing1,2,3; Zhao, Wanxia1,2,3; Luo, Wen1,2; Kang, Keke1,2; Long, Lulu1,2,3; Chen, Yang1,2; Yao, Xiaojiang1,2,3,4
2023-09-01
摘要The MnXOx catalysts (i.e., MnSmOx, MnNdOx, MnCeOx) were prepared by reverse co-precipitation method and used for NH3-SCR reaction. It is found that MnCeOx catalyst presents the best low temperature catalytic activity (higher than 90% NOx conversion in the temperature range from 125 to 225 & DEG;C) and excellent H2O + SO2 resistance. In order to explore the reason for this result, the characterization of X-ray diffraction (XRD), Raman spectroscopy, Brunauer-Emmett-Teller (BET), H2-temperature programmed reduction (H2-TPR), NH3-temperature programmed desorption (NH3-TPD), X-ray photoelectron spectroscopy (XPS) and in situ diffuse reflaxions infrared Fourier transformations spectroscopy (DRIFTS) were conducted. The obtained results suggest that MnCeOx catalyst shows the largest amount of acid sites and the best reducibility among these MnXOx catalysts. Besides, Ce4+ doping inhibits the crystallization of MnOx catalyst and shows the largest specific surface area. Finally, in situ DRIFTS experiments reveal that NH3-SCR reaction over MnCeOx catalyst follows both Langmuir-Hinshelwood (LH) and Eley-Rideal (E-R) mechanisms, which is through "fast SCR" reaction. 0 2022 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved.
关键词Low temperature NH 3-SCR reaction Rare earth Doping effect
DOI10.1016/j.jre.2022.08.004
发表期刊JOURNAL OF RARE EARTHS
ISSN1002-0721
卷号41期号:9页码:1323-1335
通讯作者Yao, Xiaojiang(yaoxj@cigit.ac.cn)
收录类别SCI
WOS记录号WOS:001070310600001
语种英语