Abstract
In this article, density functional theory (DFT) was applied to research the structures of γ-Fe2O3 and MFe2O4 (M=Co, Cu, Zn) and to optimize the adsorption models of gases such as CO and NO onto the catalysts. Additionally, the study analyzed the CO oxidation reaction on MFe2O4 (M=Co, Cu, Zn) and the selective catalytic reduction (SCR) reaction of CO + NO in CuFe2O4 and ZnFe2O4. Results showed that CO can effectively adsorb on the reactive substrates, reacting with lattice oxygen to produce CO2 and oxygen vacancies during the CO oxidation process. γ-Fe2O3 (001) required an energy of 0.95 eV to complete the reaction, while CuFe2O4 (100) needed only 0.33 eV, offering better selectivity. In the reaction of CO + NO on CuFe2O4 and ZnFe2O4, NO adsorbed on the surface with double oxygen vacancy to form N2O2 intermediate, then reacted to produce N2 and fill the oxygen vacancy. CuFe2O4 and ZnFe2O4 required energy barriers of 0.68 eV and 0.73 eV, respectively, demonstrating the feasibility of the CO-SCR reaction on the catalyst surface. Further exploration of the reaction in an oxygen-enriched environment found that O2 can inhibit the CO-SCR reaction. The study reveals that MFe2O4 (M=Co, Cu, Zn) catalysts can improve the catalytic activity of the CO oxidation reaction and CO-SCR reaction, with CuFe2O4 exhibiting the best selectivity and catalytic activity. What’s more, this study also provides insights for the simultaneous removal of CO and NO.
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Data and code availability
The data and code that support the findings of this study are available from the corresponding author, [H.L. Tan], upon reasonable request.
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Acknowledgements
Thank you to all authors for their contributions to this paper. Thank you to Professor Tan Honglin, and Professor Cai Jinming for their funding support. This work was supported by the National Natural Science Foundation of China (51662023, 11674136, 61901200), the Yunnan Fundamental Research Projects (2019FD041, 202101AW070010), Yunnan Innovation Team of Graphene Mechanism Research and Application Industrialization (202305AS350017) and Graphene Application and Engineering Research Center of Education Department of Yunnan Province (KKPP202351001).
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Conceptualization: Taoyuan Ouyang, Honglin Tan. Methodology: Taoyuan Ouyang, Honglin Tan. Validation: Taoyuan Ouyang, Yaoning Bai, Xiaodi Jiang. Formal analysis: Taoyuan Ouyang, Yaoning Bai, Xu Wang. Resources: Taoyuan Ouyang, Yuwei Yan. Data Curation: Taoyuan Ouyang, Xinru Li, Xu Wang. Writing—Original Draft: Taoyuan Ouyang. Writing—Review & Editing: Honglin Tan, Xiaoming Cai. Visualization: Taoyuan Ouyang, Yaoning Bai. Supervision: Xiaoming Cai, Xu Wang. Project administration: Xiaoming Cai, Xu Wang. Funding acquisition: Honglin Tan, Jinming Cai.
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Ouyang, T., Bai, Y., Wang, X. et al. Study on the mechanism of CO oxidation and NO removal by CO-SCR over MFe2O4 (M=Co, Cu, Zn). J Mater Sci 59, 8147–8159 (2024). https://doi.org/10.1007/s10853-024-09647-9
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DOI: https://doi.org/10.1007/s10853-024-09647-9