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

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

Energy, 2023, vol. 276, issue C

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.

Keywords: Microwave pyrolysis; Microwave discharge; Fe-based additive; Subsection kinetics; Spherical bio-char (search for similar items in EconPapers)
Date: 2023
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:276:y:2023:i:c:s036054422300943x

DOI: 10.1016/j.energy.2023.127549

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