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Insights into pyrolysis behavior of polyacrylonitrile precursors using Py-GC/MS

Chemical Papers volume 75, pages 5297–5311 (2021)Cite this article

Abstract

Pyrolysis process is a basic process to convert polyacrylonitrile (PAN)-based precursors fiber into PAN-based carbon fibers. Herein, pyrolysis behavior of pure PAN precursor and PAN precursor modified by transition metal Co and Fe was online analyzed. The effect of metal salts addition, pyrolysis temperature, and peroxidation on the formation of pyrolysis products were online analyzed via analytical pyrolysis gas chromatography/mass spectrometry (Py-GC/MS). The results showed that the weight loss of Co-Fe/PAN-1 can be divided into two stages with the addition of transition metal Co and Fe, and it is contributed to the formation of C2H4N2, C4H8N2, C6H6N2, and C6H8N2 at the temperature range of 400 ℃–800 ℃. The number of pyrolysis products decreases, and CO2 is the main pyrolysis product after pre-oxidation of PAN-2 and Co-Fe/PAN-2. After carbonization, the formation of Co-Fe alloy was detected in Co-Fe/PAN-2@CNFs because of the addition of Co and Fe, and the specific surface area of Co-Fe/PAN-2@CNFs is 426 m2/g.

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Abbreviations

PAN-1:

PAN-1 was pre-oxidized in air at 280 ℃ for 2 h

PAN-2:

PAN-1 was pre-oxidized in air at 280 ℃ for 2 h

Co-Fe/PAN-1:

The precursor nanofiber film with the addition of metal salts dried at 60 °C in vacuum for 7 h

Co-Fe/PAN-2:

Co-Fe/PAN-2 was pre-oxidized in air at 280 ℃ for 2 h

PAN-2@CNFs:

PAN-2 is carbonized under N2 atmosphere at 800 ℃

Co-Fe/PAN-2@CNFs:

Co-Fe /PAN -2 is carbonized in N2 atmosphere at 800 ℃

Py-GC/MS:

Pyrolysis gas chromatography/mass spectrometry

TG:

Thermogravimetry

SEM:

Scanning electron microscopy

XRD:

X-ray diffraction

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Acknowledgements

The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (No. 31870570) and the Scientific Research Start-up Funding for Special Professor of Minjiang Scholars, Xiamen University.

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Authors and Affiliations

  1. Fujian Provincial Industry Technologies Development Base for New EnergyFujian Provincial Engineering and Research Center of Clean and High-Valued Technologies for BiomassXiamen Key Laboratory for High-Valued Conversion Technology of Agricultural BiomassCollege of Energy, Xiamen University, Xiamen, 361102, People’s Republic of China

    Qian Liu, Xinyu Yang, Dipan Xuan, Zhe Lu, Fenqiang Luo, Shuirong Li, Yueyuan Ye, Duo Wang, Dechao Wang & Zhifeng Zheng

  2. China Fujian Innovation, Laboratory of Energy Materials Science and Technology (Tan Kah Kee Innovation Laboratory), Xiamen, 361102, People’s Republic of China

    Dechao Wang & Zhifeng Zheng

  3. Fujian Provincial Key Laboratory of Activated Carbon, Fujian Yuanli Active Carbon. Co., LTD, Nanping, 353000, People’s Republic of China

    Cunbiao Miao & Zhun Liu

Authors
  1. Qian Liu
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  2. Xinyu Yang
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Contributions

Q.L and Z.Z. conceived and designed of the work. X.Y., D.X., and Z.L. cooperated on the experiment. F.L., D.W. (Duo Wang), and S.L. analyzed or interpreted the data. Q.L. wrote the manuscript. Z.Z. and D.W. (Dechao Wang) ensured funding for project contributed materials, and they are the corresponding author. D.W (Dechao Wang) Y.Y., C.M., and Z.L. helped to revise the manuscript. All authors have read and approved the manuscript.

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Correspondence to Dechao Wang or Zhifeng Zheng.

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Liu, Q., Yang, X., Xuan, D. et al. Insights into pyrolysis behavior of polyacrylonitrile precursors using Py-GC/MS. Chem. Pap. 75, 5297–5311 (2021). https://doi.org/10.1007/s11696-021-01714-8

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  • DOI: https://doi.org/10.1007/s11696-021-01714-8

Keywords

  • PAN-based precursor
  • Pyrolysis
  • Co and Fe modification
  • Temperature
  • Pre-oxidation