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Effects of MnO2 Crystal Phases in MnO2/CeO2 Catalyst for NO Reduction by NH3-SCR

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Abstract

The low-temperature (α-/β-/γ-/δ-MnO2/CeO2-Nanorod) catalysts have been synthesized using the hydrothermal method followed by wet-impregnation and anaylzed in the Inconel reactor for selective catalytic reduction of NO using NH3 as a reducing agent. The catalysts were characterized by the Brunauer-Emmett characterized catalysts–Teller, X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy-Energy dispersive X-ray spectroscopy, transmission electron microscopy and Raman spectroscopy. The characterization analysis of the catalysts revealed that the α-MnO2/CeO2-Nanorod has the highest specific surface area, surface Ce3+ and Mn4+, and oxygen storage capacity among all the catalysts. The activity results exhibited that in the 50–450 °C temperature range, the α-MnO2/CeO2-Nanorod has the maximum NO conversion and N2 selectivity. It showed the highest NO conversion (75%) and N2 selectivity (86%) at 250 °C. As the amount of α-MnO2 increased in the α-MnO2/CeO2-Nanorod catalyst, the NO conversion with N2 selectivity exceeded 94.25% and 95%, respectively.

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Acknowledgements

Financial support from the Science and Engineering Research Board (SERB), Government of India (SPG/2021/003603) is sincerely acknowledged.

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Science and Engineering Research Board (SERB), Government of India, SPG/2021/003603.

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  1. Department of Chemical Engineering & Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi, 221005, India

    Shyam Sunder Rao & Sweta Sharma

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Rao, S.S., Sharma, S. Effects of MnO2 Crystal Phases in MnO2/CeO2 Catalyst for NO Reduction by NH3-SCR. Catal Lett 154, 1768–1781 (2024). https://doi.org/10.1007/s10562-023-04438-4

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