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利用同步辐射真空紫外光电离质谱技术研究了正丁烷和异丁烷在流动反应器中的低压热解,实验温度为823~1823 K. 通过扫描光电离效率(PIE)谱探测并鉴定了20多种热解产物,特别是多种自由基和同分异构体. 在质谱分析的基础上讨论了正丁烷和异丁烷热解的不同特性,从而为丁烷同分异构体分解路径的讨论提供了实验依据. 通过讨论可以发现,丁烷的同分异构体结构对它们的主要分解路径具有强烈的影响,从而导致了它们质谱和PIE谱的差异,如不同的主要产物和丁烯产物结构等. 此外与正丁烷热解相比,异丁烷热解在较低的温度下即可生成苯,这与后者中炔丙基和C4物种等苯前驱体的生成得到了加强是密切相关的,也为解释支链烷烃碳烟生成趋势高于直链烷烃的现象提供了实验线索.  相似文献   
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A numerical investigation on the co-pyrolysis of 1,3-butadiene and propyne is performed to explore the synergistic effect between fuel components on aromatic hydrocarbon formation.A detailed kinetic model of 1,3-butadiene/propyne co-pyrolysis with the sub-mechanism of aromatic hydrocarbon formation is developed and validated on previous 1,3-butadiene and propyne pyrolysis experiments.The model is able to reproduce both the single component pyrolysis and the co-pyrolysis experiments,as well as the synergistic effect between 1,3-butadiene and propyne on the formation of a series of aromatic hydrocarbons.Based on the rate of production and sensitivity analyses,key reaction pathways in the fuel decomposition and aromatic hydrocarbon formation processes are revealed and insight into the synergistic effect on aromatic hydrocarbon formation is also achieved.The synergistic effect results from the interaction between 1,3-butadiene and propyne.The easily happened chain initiation in the 1,3-butadiene decomposition provides an abundant radical pool for propyne to undergo the H-atom abstraction and produce propargyl radical which plays key roles in the formation of aromatic hydrocarbons.Besides,the 1,3-butadiene/propyne co-pyrolysis includes high concentration levels of C3 and C4 precursors simultaneously,which stimulates the formation of key aromatic hydrocarbons such as toluene and naphthalene.  相似文献   
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