Abstract In this study, waste tyre pyrolysis characteristic was investigated by a thermogravimetric analyzer combined with a mass spectrometer (MS). At the same time, the functional groups at the surface of residue char were also characterized by a Fourier-transform infrared (FTIR) spectrometer. The main components of the gas evolved from tyre pyrolysis process were H2O, CO, CO2, and hydrocarbon. According to MS and thermogravimetric (TG) curves, tyre pyrolysis could be divided into four stages. The first stage was due to water vaporization and plasticizer decomposition at the temperature below 320 °C. The secondary stage was attributed to natural rubber decomposition at 320–400 °C, and the third stage was related to the decomposition of synthetic rubber, which took place at 400–520 °C. The fourth stage was occurred above 520 °C. The variation of the functional groups on the residue char analyzed by FTIR also proved the above assumption.

中文翻译：

---

废旧轮胎的热解特性及机理：热重-质谱分析

摘要 本研究采用热重分析仪结合质谱仪(MS)对废轮胎热解特性进行研究。同时，还通过傅里叶变换红外（FTIR）光谱仪对残炭表面的官能团进行了表征。轮胎热解过程产生的气体的主要成分是 H2O、CO、CO2 和碳氢化合物。根据质谱和热重（TG）曲线，轮胎热解可分为四个阶段。第一阶段是由于在低于 320 °C 的温度下水汽化和增塑剂分解。第二阶段归因于天然橡胶在 320-400 °C 的分解，第三阶段与合成橡胶的分解有关，发生在 400-520 °C。第四阶段发生在 520 °C 以上。