Shaanxi Key Laboratory of Energy Chemical Process Intensification, School of Chemical Engineering and Technology, Xi'an Jiaotong University, No. 28, West Xianning Road, Xi'an, 710049, Shaanxi, China.
College of Chemistry and Chemical Engineering, Department of Energy and Chemical Engineering, Henan Polytechnic University, No. 2001, Century Avenue, Jiaozuo, Henan, 454003, People's Republic of China.
Environ Sci Pollut Res Int. 2022 Oct;29(48):72117-72125. doi: 10.1007/s11356-021-18451-w. Epub 2022 Jan 4.
A Pyroprobe 5000 pyrolyzer connected to a gas chromatography-time-of-flight mass spectrometry (Py-GC-TOF-MS) was used to analyze the decomposition behavior of waste tire (WT). Effects of several typical parameters such as heating rate, atmosphere, reaction temperature, retention time, and zeolites on molecular composition and relative contents of the liquid products were investigated. Without added zeolite, the pyrolysis products mainly consisted of limonene, 1,4-pentadiene, and monocyclic aromatic hydrocarbons (MAHs) such as benzene, toluene, ethylbenzene, and xylene (BTEX). L-limonene was the dominant fraction (> 85%) of the limonene. Temperature and time presented the most significant effect on the liquid products' molecular composition and relative content, and increasing temperature and time reduced the contents of alkenes and increased the concentration of MAHs. With added zeolite, the molecular composition of the liquid products was greatly affected. All the liquid products produced with zeolite had higher MAHs and lower alkenes compared with those without added zeolite. Among the zeolites tested, Hβ was the most beneficial catalyst to the production of aromatic hydrocarbons as the MAHs reached the highest value of 53.09%. The N, S-compound mainly consisted of benzothiazole and 2-methyl-benzothiazoles-important rubber accelerators. The O, S-compound mainly consisted of sulfones or sulfoxides.
采用 Pyroprobe 5000 型热解仪与气相色谱-飞行时间质谱联用仪（Py-GC-TOF-MS）分析废旧轮胎（WT）的热解行为。考察了升温速率、气氛、反应温度、保留时间和沸石等几种典型参数对液体产物分子组成和相对含量的影响。未添加沸石时，热解产物主要由柠檬烯、1,4-戊二烯和单环芳烃（MAHs）组成，如苯、甲苯、乙苯和二甲苯（BTEX）。L-柠檬烯是柠檬烯的主要馏分（>85%）。温度和时间对液体产物的分子组成和相对含量影响最大，升高温度和延长时间会降低烯烃含量，增加 MAHs 浓度。添加沸石后，液体产物的分子组成受到很大影响。与未添加沸石相比，所有添加沸石的液体产物中的 MAHs 含量更高，烯烃含量更低。在所测试的沸石中，Hβ 是最有利于芳烃生成的催化剂，因为 MAHs 的含量达到了 53.09%的最高值。N、S 化合物主要由苯并噻唑和 2-甲基苯并噻唑组成，是重要的橡胶促进剂。O、S 化合物主要由砜或亚砜组成。
