原位热解飞行时间质谱法研究低阶煤与聚苯乙烯的共热解行为,Fuel

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原位热解飞行时间质谱法研究低阶煤与聚苯乙烯的共热解行为
Fuel ( IF 6.7 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.fuel.2020.119461
Yunfei Wu , Jialong Zhu , Shun Zhao , Dechao Wang , Lijun Jin , Haoquan Hu

摘要原位检测主要挥发物对于煤和废塑料的共热解相互作用至关重要，并且可以根据主要挥发物的分布和动力学揭示它们的相互作用。在本研究中，采用新型原位热解飞行时间质谱 (Py-TOF-MS) 分析了低阶平朔煤 (PC) 和聚苯乙烯共热解的主要挥发分分布和演化行为。 (PS)，并揭示了 PC/PS 共热解结合不同动力学模型的相互作用机制。TG 结果表明，PC 与 PS 的混合比为 7:3 在改善挥发物释放性能方面具有最佳的相互作用。根据原位 Py-TOF-MS 分析，PS 的加入可以促进挥发物从 418 °C (PC) 的峰值提前释放到 389 °C，并显着增强 H 转移。其中，单环芳烃的增加归因于Diels-Alder和脱水反应，而苯乙烯单体由于共热解而明显增加了2.15%至7.34%，增强了PS主链上Car-Cβ键的断裂. 此外，动力学研究表明，活化能的变化可以为共热解相互作用提供有效的补充。

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Co-pyrolysis behaviors of low-rank coal and polystyrene with in-situ pyrolysis time-of-flight mass spectrometry

Abstract In-situ detection of the primary volatiles is vital for co-pyrolysis interactions of coal and waste plastics, and can reveal their interactions based on the primary volatiles distribution and kinetics. In this study, a novel in-situ pyrolysis time-of-flight mass spectrometry (Py-TOF-MS) was applied to analyze primary volatiles distribution and evolved behaviors of co-pyrolysis of a low-rank Pingshuo coal (PC) and polystyrene (PS), and disclose the interaction mechanisms of PC/PS co-pyrolysis combined with different kinetic models. TG results indicated that the blending ratio of PC to PS being 7:3 has the best interaction in improving volatiles evolved performance. According to in-situ Py-TOF-MS analysis, the addition of PS can promote early release of volatiles from the peak of 418 °C (PC) to 389 °C, and dramatically enhance H-transfer. Among them, the increase of monocyclic aromatic hydrocarbons ascribed to the Diels-Alder and dehydration reaction, while the styrene monomer obviously increases from 2.15% to 7.34% due to the co-pyrolysis enhances the cleavage of Car-Cβ bond on the PS main chain. Moreover, kinetics study identified that the variation of activation energy can provide effective supplements to the co-pyrolysis interactions.

更新日期：2021-02-01

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