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Producing eco-methane with raw syngas containing miscellaneous gases and tar by using a municipal solid waste char-based catalyst

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Listed:
  • Mei, Zhenfei
  • Chen, Dezhen
  • Qian, Kezhen
  • Zhang, Ruina
  • Yu, Weiwei

Abstract

Municipal solid waste pyrolysis char (MSWC) can be used as a catalyst carrier to support the synthesis of eco-methane from the syngas. In this paper, to understand the impacts of impurities in the raw syngas, the impacts of the H2/COx ratio, the H2O concentration, and the toluene concentration on methanation were investigated over a MSWC-supported Ni-based catalyst (Ni-MSWC). The varying H2/COx ratio in syngas affected CH4 and H2 concentrations in the final product. A lower H2/COx ratio corresponded to a higher CH4 concentration and a lower H2 concentration. The H2O concentration of less than 12% (vol.) in the syngas did not inhibit methanation, whereas excessive H2O was not favorable to the COx conversion; meanwhile, it destroyed the catalyst matrix by gasification. The Ni-MSWC catalyst showed a good tolerance to toluene (<100 g/Nm3), a representative of the tar. However, an excessively high concentration of toluene such as 200 g/Nm3 caused serious carbon deposition, significantly reducing CH4 yield. The introduction of H2O in 18% (vol.) in the syngas containing toluene (200 g/Nm3) alleviated carbon deposition by steam reforming of toluene; however, methanation was still inhibited. The results of this study provide guidance for the synthesis of eco-methane from the waste-derived syngas.

Suggested Citation

  • Mei, Zhenfei & Chen, Dezhen & Qian, Kezhen & Zhang, Ruina & Yu, Weiwei, 2022. "Producing eco-methane with raw syngas containing miscellaneous gases and tar by using a municipal solid waste char-based catalyst," Energy, Elsevier, vol. 254(PA).
    • Handle: RePEc:eee:energy:v:254:y:2022:i:pa:s0360544222011471
    DOI: 10.1016/j.energy.2022.124244
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    References listed on IDEAS

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    1. Ming-Hui Zhou & Shui-Long Shen & Ye-Shuang Xu & An-Nan Zhou, 2019. "New Policy and Implementation of Municipal Solid Waste Classification in Shanghai, China," IJERPH, MDPI, vol. 16(17), pages 1-10, August.
    2. Wang, Na & Chen, Dezhen & Arena, Umberto & He, Pinjing, 2017. "Hot char-catalytic reforming of volatiles from MSW pyrolysis," Applied Energy, Elsevier, vol. 191(C), pages 111-124.
    3. Ana Gonçalves & Jaime Filipe Puna & Luís Guerra & José Campos Rodrigues & João Fernando Gomes & Maria Teresa Santos & Diogo Alves, 2019. "Towards the Development of Syngas/Biomethane Electrolytic Production, Using Liquefied Biomass and Heterogeneous Catalyst," Energies, MDPI, vol. 12(19), pages 1-21, October.
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