Fe-Modified Mesh-Structured Mn2O3/γ-Al2O3/Al Catalysts: Enriched Surface Active Oxygen and Superior Redox Properties for Enhanced NH3-SCO Performance

Pei, Jingling; Shu, Qingli; Zhang, Wenwen; Zhang, Qi

doi:10.3390/catal16070584

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Fe-Modified Mesh-Structured Mn₂O₃/γ-Al₂O₃/Al Catalysts: Enriched Surface Active Oxygen and Superior Redox Properties for Enhanced NH₃-SCO Performance

¹

School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China

²

State Key Laboratory of Green Chemical Engineering and Industrial Catalysis, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China

^*

Author to whom correspondence should be addressed.

Catalysts 2026, 16(7), 584; https://doi.org/10.3390/catal16070584

Submission received: 24 February 2026 / Revised: 18 March 2026 / Accepted: 25 May 2026 / Published: 26 June 2026

(This article belongs to the Special Issue Catalytic Applications of Nanomaterials in Air Pollutant Degradation)

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Abstract

Ammonia-selective catalytic oxidation (NH₃-SCO) is an effective technology for eliminating NH₃ slip; however, the development of catalysts that simultaneously exhibit excellent low-temperature (<350 °C) activity and high N₂ selectivity remains a significant challenge. A novel structured monolithic mesh-type Fe_x-Mn₂O₃/γ-Al₂O₃/Al catalyst was developed. XPS, H₂-TPR, and O₂-TPD results demonstrate that Fe doping markedly increases the concentration of surface-adsorbed active oxygen species and enhances the redox capability. As a result, the optimally doped Fe_6.61-Mn₂O₃/γ-Al₂O₃/Al catalyst achieved complete NH₃ conversion at 210 °C with a 75% N₂ selectivity, outperforming previously reported Mn-based catalysts. Density functional theory (DFT) calculations further confirm that Fe modification enhances O₂ adsorption energy. In addition, the introduction of Fe significantly improves the catalyst’s resistance to SO₂ and H₂O. In situ FTIR results indicate that the NH₃-SCO reaction over Fe-Mn₂O₃/γ-Al₂O₃/Al proceeds predominantly via an internal selective catalytic reduction (i-SCR) pathway.

Keywords: NH₃-SCO; Mn₂O₃; Fe-doped; monolithic support; surface active oxygen

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MDPI and ACS Style

Pei, J.; Shu, Q.; Zhang, W.; Zhang, Q. Fe-Modified Mesh-Structured Mn₂O₃/γ-Al₂O₃/Al Catalysts: Enriched Surface Active Oxygen and Superior Redox Properties for Enhanced NH₃-SCO Performance. Catalysts 2026, 16, 584. https://doi.org/10.3390/catal16070584

AMA Style

Pei J, Shu Q, Zhang W, Zhang Q. Fe-Modified Mesh-Structured Mn₂O₃/γ-Al₂O₃/Al Catalysts: Enriched Surface Active Oxygen and Superior Redox Properties for Enhanced NH₃-SCO Performance. Catalysts. 2026; 16(7):584. https://doi.org/10.3390/catal16070584

Chicago/Turabian Style

Pei, Jingling, Qingli Shu, Wenwen Zhang, and Qi Zhang. 2026. "Fe-Modified Mesh-Structured Mn₂O₃/γ-Al₂O₃/Al Catalysts: Enriched Surface Active Oxygen and Superior Redox Properties for Enhanced NH₃-SCO Performance" Catalysts 16, no. 7: 584. https://doi.org/10.3390/catal16070584

APA Style

Pei, J., Shu, Q., Zhang, W., & Zhang, Q. (2026). Fe-Modified Mesh-Structured Mn₂O₃/γ-Al₂O₃/Al Catalysts: Enriched Surface Active Oxygen and Superior Redox Properties for Enhanced NH₃-SCO Performance. Catalysts, 16(7), 584. https://doi.org/10.3390/catal16070584

Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. See further details here.

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Fe-Modified Mesh-Structured Mn₂O₃/γ-Al₂O₃/Al Catalysts: Enriched Surface Active Oxygen and Superior Redox Properties for Enhanced NH₃-SCO Performance

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