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Influences of iron additives on microwave-assisted pyrolysis of woody biomass and microwave-induced discharge with spherical bio-char

Author

Listed:
  • Li, Longzhi
  • Cao, Kangqi
  • Cai, Dongqiang
  • Zhang, Zhonglei
  • Zhao, Zhiyang
  • Yu, Miao
  • Zhang, Lianjie
  • Zhang, Qiang
  • Zou, Guifu
  • Wang, Cuiping

Abstract

Microwave-assisted pyrolysis with iron additives is a promising method for biomass utilization. The bio-char from this method can induce microwave discharge. However, the influencing mechanism of iron additives on microwave-assisted pyrolysis and subsequent microwave-induced discharge is unclear. Therefore, the work focuses on the influences of various iron additives on microwave-assisted pyrolysis of woody biomass and microwave-induced discharge with spherical bio-char. It was revealed that Fe2(SO4)3 and Fe2O3 mainly impose the catalytic effect at the second pyrolysis stage, reducing activated energies by 35.5% and 77.3%, respectively. The addition of Fe(OH)3, Fe2(SO4)3 and Fe2O3 is conducive for the generation of bio-char, bio-oil and synsgas, respectively. The iron additives effectively promote initial discharge intensity, which is enhanced by 87.6% with Fe2(SO4)3. Besides, Fe2(SO4)3 and Fe(OH)3 prolong the discharge duration to twice and triple of that in free of additives. Additionally, microwave discharge raises the temperature of bio-char bed layer, reaching the maximum temperature of 834.4 °C. This paper provides new insights into the value-added utilization of biomass.

Suggested Citation

  • Li, Longzhi & Cao, Kangqi & Cai, Dongqiang & Zhang, Zhonglei & Zhao, Zhiyang & Yu, Miao & Zhang, Lianjie & Zhang, Qiang & Zou, Guifu & Wang, Cuiping, 2023. "Influences of iron additives on microwave-assisted pyrolysis of woody biomass and microwave-induced discharge with spherical bio-char," Energy, Elsevier, vol. 276(C).
    • Handle: RePEc:eee:energy:v:276:y:2023:i:c:s036054422300943x
    DOI: 10.1016/j.energy.2023.127549
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    References listed on IDEAS

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