Effect of Cu modification on NH3-SCR denitration of rare earth tailings catalyst

被引：0

作者：

Hou L. ^{[1
,2
,3
]}

Xu J. ^{[1
]}

Fu S. ^{[1
]}

Wu W. ^{[1
,2
,3
]}

机构：

[1] Key Laboratory of Efficient and Clean Combustion, School of Energy and Environment, Inner Mongolia University of Science & Technology, Inner Mongolia, Baotou

[2] Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner Mongolia University of Science & Technology, Inner Mongolia, Baotou

[3] Collaborative Innovation Center of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Inner Mongolia, Baotou

来源：

Huagong Jinzhan/Chemical Industry and Engineering Progress | 2023年 / 42卷 / 02期

关键词：

catalyst; modification; rare earth tailings; reactivity; selecitve catalytic reduction;

D O I：

10.16085/j.issn.1000-6613.2022-0703

中图分类号：

学科分类号：

摘要：

Natural minerals have become a hotspot in catalyst research due to their large reserves, rich active components, low price, and environmental greenness. In the paper, rare earth tailings were modified with Cu by immersion-hydrothermal method, and the effect of Cu modification on the catalytic performance of rare earth tailings was investigated by XRD, SEM-EDS, XPS, NH3-TPD, H2-TPR and BET. The results showed that the denitrification performance of the rare earth tailings catalysts was substantially improved after Cu modification, and the active reaction temperature window was broadened to 200—350°C. The denitrification efficiency of the catalyst increased and then decreased with the increase of Cu content, and the most obvious performance enhancement was achieved at an amount of 2.5%. Cu modification increased the specific surface area of the rare earth tailings catalyst, and Cu existed mainly as CuO on the catalyst surface which interacted with Fe2O3,making the binding energies of Cu2+ , Fe2+ and Fe3+ shifted significantly. The electron cloud density around Fe ions was induced to decrease, and the strongest interaction between the two in the 2.5% Cu modified catalyst enhanced the redox ability and acid activity center of the catalyst, and the reduction temperature of CuO had stronger influence on the denitrification activity than its oxidation ability, while the oxidation ability of Fe2O3 had stronger influence on the denitrification activity than its reduction temperature. The more mobile adsorbed oxygen on the catalyst surface was favorable for the denitrification reaction. © 2023 Chemical Industry Press. All rights reserved.

引用

页码：765 / 773

页数：8

共 48 条

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