化学
雷亚克夫
热分解
激进的
六甲基二硅氧烷
分解
热稳定性
氢键
物理化学
键裂
计算化学
光化学
有机化学
分子
等离子体
物理
量子力学
催化作用
作者
Wei Yu,Chao Liu,Luxi Tan,Qibin Li,Liyong Xin,Shukun Wang
出处
期刊:Energy
[Elsevier]
日期:2023-12-01
卷期号:284: 129289-129289
被引量:1
标识
DOI:10.1016/j.energy.2023.129289
摘要
The thermal stability and decomposition mechanism of octamethyltrisiloxane (MDM) were studied using a combination of experimental, ReaxFF simulation, and DFT calculation techniques. After heating MDM for 24 h at 250 °C and 1 MPa, the signature product CH4 was detected, along with liquid products such as hexamethyldisiloxane (MM) and decamethyltetrasiloxane (MD2M). The decomposition rate of MDM remained relatively constant in the temperature range of 250 °C–320 °C but exhibited a sharp increase at 350 °C. Higher pressure was found to promote MDM polymerization. The oxygen (O) atoms displayed a large negative electrostatic potential, while the hydrogen (H) and silicon (Si) atoms exhibited a large positive potential. The electrostatic interaction facilitated the rearrangement reactions, with O and carbon (C) atoms being the most reactive for electrophilic and free radical reactions. The thermal decomposition of MDM initiated with the cleavage of Si–C bonds. Hydrogen extraction reactions between methyl radicals and MDM, as well as Si–O bond rearrangement reactions of demethylated radicals with MDM, further promoted MDM decomposition and the formation of CH4 and siloxane oligomers. These findings are significant for the safe application of MDM as a working fluid in ORC system.
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