Insights into enhancement of low-temperature NH3-SCR activity and SO2 resistance of TiO2/CoMnFeOx LDOs catalysts: Combination of experimental and DFT calculations

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology Pub Date : 2025-04-02 DOI:10.1016/j.seppur.2025.132819

Zhenyu Chen, Jiarong Zhao, Yanshan Gao, Xiaozhe Song, Guocheng Liu, Shuaishuai Xin, Chengzhi Zhou, Yanjun Xin, Qiang Wang, Qinghua Yan

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引用次数: 0

Abstract

Layered double hydroxides (LDHs) material was used as a precursor, and combined with TiO₂ material characteristics, TiO₂/CoMnFeO_x LDOs composite material was controllable prepared for NH₃-SCR denitration technology. At a wide temperature range of 200-300℃, the optimized TiO₂(0.5)/Co_0.5Mn_1.5Fe₁O_x catalyst had denitration efficiency exceeding 98 %, and N₂ selectivity exceeding 85 % at 200℃. Advanced analytical techniques explored the structure and physicochemical properties of the catalyst materials, and the abundant active species and surface oxygen, moderate surface acids and redox capacity together promoted the NH₃-SCR reaction. The transient reaction revealed that the TiO₂(0.5)/Co_0.5Mn_1.5Fe₁O_x catalyst reduced the production of N₂O by inhibiting the “NH₃ + O₂ + NO_x” pathway. Moreover, TiO₂(0.5)/Co_0.5Mn_1.5Fe₁O_x catalyst exhibited good resistance stability against SO₂ and H₂O. In situ DRIFTS analysis and DFT calculations provide insight into the mechanism of catalytic reaction and resistance to poisoning. This work provided strategies for improving the NH₃-SCR activity and application stability of catalysts, which were important for the development of low-temperature denitration technology.

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来源期刊

Separation and Purification Technology 工程技术-工程：化工

CiteScore

14.00

自引率

12.80%

发文量

2347

审稿时长

43 days

期刊介绍： Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.