不饱和化合物掺杂富甲烷火焰中芳烃的形成
Formation of aromatics in rich methane flames doped by unsaturated compounds
摘要：
为了更好地理解通向第一芳环的不同通道的重要性，我们研究了掺杂有几种不饱和烃的层流富预混甲烷火焰的结构：丙二烯和丙炔，因为它们是炔丙基自由基的前体，众所周知炔丙基自由基在形成苯，1，3-丁二烯，以证明由于C4化合物的反应可能产生苯，最后是环戊烯，环戊烯是被认为容易异构化产生苯的环亚甲基自由基的来源。已使用16%的添加剂/CH4比率和1.79的当量比。这些火焰已经在6.7kPa的压力下使用氩气作为稀释剂在燃烧器上稳定。提出了联二烯、丙炔、1，3-丁二烯和环戊烯氧化的新机理，包括苯和甲苯的生成和分解。通过流速分析得出了芳烃生成的主要反应途径，并对三种添加剂进行了比较。
英文摘要：
In order to better understand the importance of the different channels leading to the first aromatic ring, we have investigated, the structure of a laminar rich premixed methane flame doped with several unsaturated hydrocarbons: allene and propyne, as they are precursors of propargyl radicals, which are well known as having an important role in forming benzene, 1,3-butadiene, to put in evidence a possible production of benzene due to reactions of C4 compounds, and, finally, cyclopentene, which is a source of cyclopentadienyl methylene radicals which are supposed to easily isomerizes to give benzene. A ratio additive / CH4 of 16 % and an equivalence ratio of 1.79 have been used. These flames have been stabilized on a burner at a pressure of 6.7 kPa using argon as dilutant. A new mechanism for the oxidation of allene, propyne, 1,3 butadiene and cyclopentene has been proposed including the formation and decomposition of benzene and toluene. The main reaction pathways of formation of aromatics have been derived from flow rate analyses and have been compared for the three types of additives.
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