State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, China.
State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, China.
J Hazard Mater. 2017 Jul 5;333:10-22. doi: 10.1016/j.jhazmat.2017.03.029. Epub 2017 Mar 14.
The effects of temperatures, catalysts, and catalyst contents on polyethylene (PE) pyrolysis were investigated by using single-photon ionization time-of-flight mass spectrometry (SPI-TOFMS). The mass spectra of pyrolyzed PE and PE/catalysts from 300°C to 800°C illustrate that the pyrolysis reactions were apparently promoted and varied by introducing HZSM-5, HUSY, and MCM-41. As microporous catalysts, HZSM-5 and HUSY were found to accelerate the BTX formation at 400°C, which could not be observed for pure PE until 800°C. With the existence of MCM-41, only alkenes were produced below 600°C. The pyrolysis processes could to be accelerated by adding catalysts. Principal components analysis (PCA) was finally employed to identify the main factors with influence on the products distribution. Analytical results showed that the yield of the majority of products could be affected by different experimental conditions, that the type of catalysts makes the most significant influence. The impact of different types of catalysts on fire hazard of PE was studied by using the cone calorimeter. The results indicated that the time to ignition (TTI) and the peak heat release rate (pHRR) were changed remarkably. It is worth noting that with the addition of MCM-41, the pHRR is the minimum.
采用单光子电离飞行时间质谱（SPI-TOFMS）研究了温度、催化剂和催化剂含量对聚乙烯（PE）热解的影响。从 300°C 到 800°C 的热解 PE 和 PE/催化剂的质谱图表明，引入 HZSM-5、HUSY 和 MCM-41 明显促进和改变了热解反应。作为微孔催化剂，HZSM-5 和 HUSY 被发现可在 400°C 加速 BTX 的形成，而纯 PE 直到 800°C 才观察到这种情况。在 MCM-41 的存在下，低于 600°C 仅生成烯烃。添加催化剂可以加速热解过程。最后采用主成分分析（PCA）来识别对产物分布有影响的主要因素。分析结果表明，大多数产物的产率可能会受到不同实验条件的影响，催化剂的类型影响最大。通过锥形量热仪研究了不同类型的催化剂对 PE 火灾危险性的影响。结果表明，点火时间（TTI）和峰值热释放率（pHRR）发生了显著变化。值得注意的是，随着 MCM-41 的添加，pHRR 最小。
