ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

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

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

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, People’s Republic of China

E-mail: wangdechao@xmu.edu.cn

Received: 8 April 2021  Accepted: 21 May 2021

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.

Graphic abstract

Keywords: PAN-based precursor; Pyrolysis; Co and Fe modification; Temperature; Pre-oxidation

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-021-01714-8

Chemical Papers 75 (10) 5297–5311 (2021)