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Study on effect of O2/H2O/CO2 on CH4 and NOx removal with NTP

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Abstract

In this paper, the influence mechanism of O2/H2O/CO2 on the removal of CH4 and NOx by non-thermal plasma (NTP) combined with selective catalytic reduction of NOx by CH4 (NTP-CH4-SCR) was investigated. The results show that the increase of NTP energy density (0 J/L-491 J/L) promoted the CH4 removal but inhibited the NOx removal in NTP-CH4-SCR. In CH4-SCR, H2O could significantly reduce catalyst activity; adding 0.5% H2O decreased the removal efficiency of CH4 and NOx from 30 to 2.9% and 58.4 to 1.8%, respectively. In NTP-CH4-SCR, the increase of H2O content (0.5–10.4%) contributed to formation of oxidizing free radicals such as OH and HO2; thus, the CH4 removal efficiency increased from 24.1 to 37.4%. The increase of O2 content (0–10%) promoted the adsorption of NO and the reaction of adsorption products with CH4 oxidation products, causing the CH4 removal efficiency increased from 1.3 to 32.3% and NOx removal efficiency increased from 1.5 to 61.6% in CH4-SCR. Increasing O2 (0–10%) produced more O and HO2 radicals in NTP-CH4-SCR, resulting in the increase of CH4 removal efficiency from 18.6 to 44.9%. However, these O and HO2 radicals would react with N radicals to form NO2, NO3, etc., thus decreasing NOx removal efficiency from 68% to 40.8%. The change of CO2 concentration has little effect on CH4 and NOx removal efficiency.

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All data generated or analyzed during this study are included in this published article. The data and any materials displayed in this manuscript are of availability.

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Funding

This work has been financially supported by the Weichai Power Co., Ltd. (109–612102381).

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Authors and Affiliations

  1. School of Naval Architecture, Ocean and Energy Power Engineering, Wuhan University of Technology, Wuhan, 430000, China

    Hongyu Li, Yunkai Cai, Chuang Xiang & Lin Lü

  2. Weichai Power Co., Ltd, Weifang, 261061, China

    Jie Song

Authors
  1. Hongyu Li
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  2. Yunkai Cai
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  3. Chuang Xiang
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  4. Jie Song
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  5. Lin Lü
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Contributions

HL was involved in investigation, experimental, and writing original draft. YC and CX performed investigation, experimental, and writing—review and editing. JS and LL contributed to project administration, funding acquisition, and writing—review and editing.

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Correspondence to Yunkai Cai.

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The work described was original research that has not been published previously, and not under consideration for publication elsewhere, in whole or in part. All the authors listed have approved the manuscript that is enclosed.

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Appendix

Appendix

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Table 3 Plasma chemical reactions included in the model
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3

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Table 4 Catalytic reaction
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4

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Li, H., Cai, Y., Xiang, C. et al. Study on effect of O2/H2O/CO2 on CH4 and NOx removal with NTP. Res Chem Intermed 49, 3681–3703 (2023). https://doi.org/10.1007/s11164-023-04994-9

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  • DOI: https://doi.org/10.1007/s11164-023-04994-9

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