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Effects of Ce Modification on NH3-SCR Denitration Performance of Activated Rare Earth Tailings Catalyst AITranslate

HOU Li-min; XU Jie; WANG Tian-tian; QIAO Chao-yue; CHEN Han; FU Shan-cong; WU Wen-fei
Key Laboratory of Efficient and Clean Combustion in Inner Mongolia Autonomous Region,School of Energy and Environment,Inner Mongolia University of Science&Technology;Key Laboratory of Efficient and Clean Combustion in Inner Mongolia Autonomous Region,School of Energy and Environment,Inner Mongolia University of Science&Technology;Key Laboratory of Efficient and Clean Combustion in Inner Mongolia Autonomous Region,School of Energy and Environment,Inner Mongolia University of Science&Technology;Key Laboratory of Efficient and Clean Combustion in Inner Mongolia Autonomous Region,School of Energy and Environment,Inner Mongolia University of Science&Technology;Key Laboratory of Efficient and Clean Combustion in Inner Mongolia Autonomous Region,School of Energy and Environment,Inner Mongolia University of Science&Technology;Key Laboratory of Efficient and Clean Combustion in Inner Mongolia Autonomous Region,School of Energy and Environment,Inner Mongolia University of Science&Technology;Key Laboratory of Efficient and Clean Combustion in Inner Mongolia Autonomous Region,School of Energy and Environment,Inner Mongolia University of Science&Technology
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Abstract AITranslate

Bayan Obo rare earth tailings are composed of hematite,bastnasite,fluorite,quartz and magnetite,in which rare earth element Ce and transition metals Fe,Mn are the active elements required for catalyst.In this paper,activated rare earth tailings were modified by Ce using impregnation method,and the effects of Ce modification on the performance of activated rare earth tailings catalyst were investigated by SEM-EDS,XRD,BET,NH3-TPD,H2-TPR and XPS.The results show that the Ce-modified activated rare earth tailings catalyst is dominated by mesoporous structure and Ce element is highly dispersed on the catalyst surface.There is a synergistic effect between Ce and Fe,and the existence of a redox couple between them promotes the transformation between different valence states of Ce and Fe ions,enhances the redox ability of the catalyst and increases the number of acid sites,which provides favorable environment for the adsorption and activation of NH3,improving the denitration efficiency of the catalyst.After being modified by 15%Ce,the denitration efficiency of the activated rare earth tailings increases from 70%to 82%,the N2selectivity is above 90%,and the reaction temperature window is widened to 275~450℃.

KeyWords AITranslate

rare earth tailings denitration catalyst activation Ce modification impregnation NH3-SCR

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DOI：

Chinese Library Classification Number:TD983[矿业工程—选矿]

Citation Information:

Bayan Obo rare earth tailings are composed of hematite,bastnasite,fluorite,quartz and magnetite,in which rare earth element Ce and transition metals Fe,Mn are the active elements required for catalyst.In this paper,activated rare earth tailings were modified by Ce using impregnation method,and the effects of Ce modification on the performance of activated rare earth tailings catalyst were investigated by SEM-EDS,XRD,BET,NH3-TPD,H2-TPR and XPS.The results show that the Ce-modified activated rare earth tailings catalyst is dominated by mesoporous structure and Ce element is highly dispersed on the catalyst surface.There is a synergistic effect between Ce and Fe,and the existence of a redox couple between them promotes the transformation between different valence states of Ce and Fe ions,enhances the redox ability of the catalyst and increases the number of acid sites,which provides favorable environment for the adsorption and activation of NH3,improving the denitration efficiency of the catalyst.After being modified by 15%Ce,the denitration efficiency of the activated rare earth tailings increases from 70%to 82%,the N2selectivity is above 90%,and the reaction temperature window is widened to 275~450℃.

quote

GB/T 7714-2015 [1] HOU Li-min, XU Jie, WANG Tian-tian, et al. Effects of Ce Modification on NH3-SCR Denitration Performance of Activated Rare Earth Tailings Catalyst[J]. Rare Metals and Cemented Carbides, 2023(2): 60-67.
MLA [1] HOU Li-min, et al., "Effects of Ce Modification on NH3-SCR Denitration Performance of Activated Rare Earth Tailings Catalyst." Rare Metals and Cemented Carbides, no. 2, 2023, pp. 60-67.
APA [1] HOU Li-min, XU Jie, WANG Tian-tian, QIAO Chao-yue, CHEN Han, FU Shan-cong, & WU Wen-fei. (2023). Effects of Ce Modification on NH3-SCR Denitration Performance of Activated Rare Earth Tailings Catalyst. Rare Metals and Cemented Carbides(2), 60-67.
IEEE [1] HOU Li-min, XU Jie, WANG Tian-tian, QIAO Chao-yue, CHEN Han, FU Shan-cong, and WU Wen-fei, "Effects of Ce Modification on NH3-SCR Denitration Performance of Activated Rare Earth Tailings Catalyst," Rare Metals and Cemented Carbides, no. 2, pp. 60-67, 2023. keywords: {rare earth tailings;denitration catalyst;activation;Ce modification;impregnation;NH-SCR}