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Cobalt doped Fe-Mn@CNTs catalysts with highly stability for low-temperature selective catalytic reduction of NOx

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Abstract

In this paper, we report the fabrication of cobalt-doped de-NOx catalyst by pyrolyzing an analogous metal-organic framework-74 (MOF-74) containing Fe & Mn. The resulted catalyst exhibits distinctive microstructures of manganese, cobalt, and iron immobilized on N-doped carbon nanotubes (CNTs). It is found through experiments that the trimetallic catalyst Fe2Mn1Co0.5/CNTs-50 has the best NH3-selective catalytic reduction (SCR) performance. The Fe2Mn1Co0.5/CNTs-50 exhibited excellent water and sulfur resistance and good stability under the harsh gas environment of 250 °C and/or 170 °C, NO = NH3 = 1,000 ppm, 8 vol.% O2, 20 vol.% H2O, 1,000 ppm SO2, and gas hourly space velocity (GHSV) = 75,000 h−1. The de-NOx conversion was maintained about 55% and 25% after 192 h. The water and sulfur resistance performance were much higher than commercial vanadium series catalyst. The highly water and sulfur resistance performance may be attributed to the unique core-shell microstructure and the synergistic effect of manganese, cobalt, and iron which helps reduce the formation for byproducts (NH4HSO4). This study may promote to explore the development of a high stability catalyst for low-temperature selective catalytic reduction of NOx with NH3.

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Acknowledgements

The authors acknowledge financial support from the National Natural Science Foundation of China (No. 21573286) and the Key scientific and technological innovation projects in Shandong Province (No. 2019JZZY010343).

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  1. Xin Zhang

    Present address: State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University of Petroleum, Beijing, 102249, China

Authors and Affiliations

  1. State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University of Petroleum, Beijing, 102249, China

    Pengfei Li, Haixiao Sun, Yufeng Gao, Yanyuan Zhang, Yuanyuan Liu & Xiaoping Dai

  2. Petrochina Daqing Petrochemical Research Center, Daqing, 163714, China

    Tiezhen Zhang

  3. ShanDong DongYuan New Material Technology Co., Ltd, Dongying, 257300, China

    Chengmin Ge & Hao Chen

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Li, P., Zhang, T., Sun, H. et al. Cobalt doped Fe-Mn@CNTs catalysts with highly stability for low-temperature selective catalytic reduction of NOx. Nano Res. 15, 3001–3009 (2022). https://doi.org/10.1007/s12274-021-3932-8

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