燃料化学学报（中英文）2025，Vol.53Issue(7)：1112-1122,11.DOI:10.1016/S1872-5813(24)60528-1
基于热重-激光光谱技术的聚丙烯腈热解中氰化氢演化规律研究
Evolution of hydrogen cyanide generated from polyacrylonitrile pyrolysis based on TG-LAS
摘要
Abstract
An on-line detection system for detecting hydrogen cyanide(HCN)of polyacrylonitrile(PAN)pyrolysis based on thermogravimetric-tunable diode laser absorption spectroscopy(TG-TDLAS)is constructed.Taking advantage of the characteristics that HCN has a relatively high absorption intensity at a wavelength of 1531.156 nm and that common gases in the background gas in this wavelength band cause less interference,concentration of HCN is obtained by demodulating the second harmonic of the absorption signal.By a high-precision flow controller and dilution proportioning with 99.99％standard nitrogen gas,five standard gases in the range of 20 × 10-6-100× 10-6 mol/mol are obtained.The second demodulated signal is linearly fitted with a correlation coefficient of 0.9975.Effects of four different relative molecular mass of PANs and three heating rates on the pyrolysis were analyzed.The relationship between sample weight loss rate and amount of HCN released was studied to explore non-isothermal pyrolysis kinetics of PAN.A three-stage pyrolysis kinetic model is established by dividing pyrolysis temperature stages,and the activation energies and frequency factors of different relative molecular mass at different heating rates are calculated,respectively.The results show that the higher the molecular weight and the higher the viscosity,the smaller the HCN release.HCN release and PAN weight loss rate in the first and third stages are larger than that in the second stage.It provides a certain experimental basis for further study of HCN generation mechanism in PAN pyrolysis.关键词
TG-TDLAS/聚丙烯腈/热解/HCN/波长调制Key words
TG-TDLAS/PAN/pyrolysis/HCN/wavelength modulation分类
数理科学引用本文复制引用
韩金廷,孟星星,王庚乾,孙小聪,田亚莉,和小虎,邱选兵,李传亮,王远洋..基于热重-激光光谱技术的聚丙烯腈热解中氰化氢演化规律研究[J].燃料化学学报（中英文）,2025,53(7):1112-1122,11.基金项目
The project was supported by National Natural Science Foundation of China(52076145),the Special Fund for Science and Technology Innovation Teams of Shanxi Province(202304051001034),Fundamental Research Program of Shanxi Province(202303021221147)and Special Project for Science and Technology Cooperation and Exchange of Shanxi Province(202304041101022),Practice Innovation Fund for Graduate Students in Shanxi Province(2024SJ321).国家自然科学基金(52076145),山西省科技创新人才团队专项(202304051001034),山西省基础研究计划(202303021221147),山西省科技合作交流专项(202304041101022)和山西省研究生实践创新项目(2024SJ321)资助 （52076145）
