Volume 7 Issue 6
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Article Navigation >  Green Energy&Environment  > 2022  >  7(6): 1318-1326
Yuyang Fan, Chao Liu, Xiangchen Kong, Yue Han, Ming Lei, Rui Xiao. A new perspective on polyethylene-promoted lignin pyrolysis with mass transfer and radical explanation. Green Energy&Environment, 2022, 7(6): 1318-1326. doi: 10.1016/j.gee.2021.02.004
Citation: Yuyang Fan, Chao Liu, Xiangchen Kong, Yue Han, Ming Lei, Rui Xiao. A new perspective on polyethylene-promoted lignin pyrolysis with mass transfer and radical explanation. Green Energy&Environment, 2022, 7(6): 1318-1326. doi: 10.1016/j.gee.2021.02.004
shu

A new perspective on polyethylene-promoted lignin pyrolysis with mass transfer and radical explanation

doi: 10.1016/j.gee.2021.02.004

  • Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, China

Funds:

The authors would like to express appreciation for the support of the National Key R&D Program of China (Grant no. 2018YFB1501402), the Natural Science Foundation of Jiangsu Province (Grant no. BK20190363), and the Fundamental Research Funds for the Central Universities (Grant no. 2242020R20009).

  • Received date 20 October 2020, Accepted date 05 February 2021, RevRecd date 04 February 2021, Publish date 31 December 2022,
    Abstract
  • Co-pyrolysis of lignin and waste plastics, for example polyethylene (PE), has been studied, but related reports are basically on condition optimizations. This study revealed a new perspective on PE-promoted lignin pyrolysis to phenolic monomers with mass transfer and radical explanation. Lignin and PE were first pyrolyzed individually to identify pyrolysis characteristics, pyrolytic products, as well as the suitable co-pyrolysis temperature. Then, co-pyrolysis of blended lignin/PE with various ratios was investigated. Yields of lignin products reached the maximum under lignin/PE ratio of 1:1, but blended approach always inhibited the production of lignin phenols. This resulted from the poor mass transfer and interactions between lignin and PE, in which PE pyrolysates could easily escape from the particle gaps. While in layered approach, PE pyrolysates had to pass through the lignin layer which contributed to the good interactions with lignin pyrolysis intermediates, thus the yields of lignin-derived products were significantly improved. Interactions between lignin and PE (or their pyrolysates) were mainly radical quenching reactions, and X-ray photoelectron spectrum (XPS) and electron paramagnetic resonance (EPR) of pyrolytic chars were conducted to verify these interactions controlled by mass transfer. The percentage of C==C (sp2) and concentration of organic stable radicals in layered lignin/PE char were both the lowest compared with those in blended lignin/PE and lignin char, indicating the stabilization of lignin-derived radicals by PE pyrolysates. Moreover, the spin concentration of radicals in the char from layered char/PE was lower than that in lignin char, which further affirmed the quenching of radicals by PE in the layered co-pyrolysis mode.

     

    • • Mass transfer and radical reactions together controlled lignin/PE co-pyrolysis. • Layered lignin/PE demonstrated the highest yields and lowest radical concentrations. • Possible reaction pathways of PE-promoted lignin pyrolysis were proposed.
    Yuyang Fan and Chao Liu contributed equally to the production of this paper.
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