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Synergistic Removal of NOx and VOCs from Flue Gas on Mn-Based Catalysts

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Abstract

The elimination of these two pollutants is crucial since NOx and VOCs have recently been found to be the main atmospheric pollutants in solid material combustion procedures. The synergistic removal of pollutants within the denitrification zone of SCR suffered from narrow temperature window and low activity. In this study, co-precipitation was employed to create γ-Al2O3 doped Mn-based composite catalyst materials. The link between γ-Al2O3 addition and catalytic performance was explored using XRD, SEM, and other characterisation means. The results of the activity tests demonstrated that the MnCoAlOx-7% catalyst was more than 90% effective at denitrification over an extensive temperature spectrum (95–310 °C) and 90% effective for benzene conversion at 195 °C. In the synergistic elimination process, benzene promoted the NH3-SCR reaction, whereas NOx enhances benzene oxidation at low temperatures, inhibits it at middle and high temperatures, and has no effect at high temperatures. Reaction mechanism studies had shown that benzene facilitated the formation of amides from NH3 and promoted nitrites conversion to improve denitrification efficiency during synergistic removal; NOx reduced the intermediates produced by benzene oxidation at medium and high temperatures, leading to a decrease in benzene removal.

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Acknowledgements

This work described above was financially supported by the National Natural Science Foundation of China (Grant No. U20A20132) and the National Natural Science Foundation of China (No. 42277369).

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Authors and Affiliations

  1. Key Laboratory of Special Functional Materials for Ecological Environment and Information, Ministry of Education, Hebei University of Technology, Tianjin, 300130, China

    Mengtao Li, Na Wu, Qiao Zhang & Gang Xue

  2. School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300130, People’s Republic of China

    Mengtao Li, Na Wu, Qiao Zhang & Gang Xue

  3. School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China

    Cairong Gong

Authors
  1. Mengtao Li
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  2. Na Wu
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  3. Qiao Zhang
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  4. Cairong Gong
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  5. Gang Xue
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Contributions

ML: Formal analysis, Investigation, Data Curation, Writing-Original Draft, Writing-Review & Editing, Visualization. NW: Resources, Investigation, Visualization. QZ: Investigation, Resources. CG: Supervision, Conceptualization. GX: Conceptualization, Methodology, Validation, Supervision, Project administration.

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Correspondence to Gang Xue.

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Li, M., Wu, N., Zhang, Q. et al. Synergistic Removal of NOx and VOCs from Flue Gas on Mn-Based Catalysts. Catal Lett 154, 3516–3529 (2024). https://doi.org/10.1007/s10562-024-04585-2

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