NiB₂O₄ (B = Mn or Co) catalysts for NH₃-SCR of NO_x at low-temperature in microwave field

Highlights

● Microwave-assisted catalytic NH₃-SCR reaction over spinel oxides is carried out.

● SCR reaction temperature is tremendously lowered in microwave field.

● NO conversion of NiMn₂O₄ is highly up to 90.6% at 70°C under microwave heating.

Abstract

Microwave-assisted selective catalytic reduction of nitrogen oxides (NO_x) was investigated over Ni-based metal oxides. The NiMn₂O₄ and NiCo₂O₄ catalysts were synthesized by the co-precipitation method and their activities were evaluated as potential candidate catalysts for low-temperature NH₃-SCR in a microwave field. The physicochemical properties and structures of the catalysts were characterized by X-ray diffraction (XRD), Scanning electron microscope (SEM), N₂-physisorption, NO adsorption-desorption in the microwave field, H₂-temperature programmed reduction (H₂-TPR) and NH₃-temperature programmed desorption (NH₃-TPD). The results verified that microwave radiation reduced the reaction temperature required for NH₃-SCR compared to conventional heating, which needed less energy. For the NiMn₂O₄ catalyst, the catalytic efficiency exceeded 90% at 70 °C and reached 96.8% at 110 °C in the microwave field. Meanwhile, the NiMn₂O₄ also exhibited excellent low-temperature NH₃-SCR reaction performance under conventional heating conditions, which is due to the high BET specific surface area, more suitable redox property, good NO adsorption-desorption in the microwave field and rich acidic sites.

Graphical abstract

Keywords

Microwave field / Spinel oxides / NO_x / Selective catalytic reduction

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 21806005).

Electronic Supplementary Material

Supplementary material is available in the online version of this article at https://doi.org/10.1007/s11783-023-1696-y and is accessible for authorized users.

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