贫燃2, 5-二甲基呋喃火焰中初级燃烧产物的产生和鉴定

利用同步辐射真空紫外光电离质谱结合分子束取样技术研究了燃烧当量比为0.8的2,5-二甲基呋喃(DMF)/氧气/氩气低压层流预混火焰中的初级燃烧产物, 得到了DMF火焰的光电离质谱和燃烧中间产物的光电离效率曲线, 从光电离效率曲线得到了相应分子/自由基的电离能, 将实验测量得到的电离能与文献值或者利用量子化学方法计算得到的理论值比较, 确定了DMF火焰中燃烧中间产物的化学结构, 包括尚未报道的DMF的氧化产物和更高级的衍生物, 并根据这些燃烧中间产物的化学结构推断和分析了DMF及其初级燃烧产物的生成与消耗过程.

Formation and identification of primary combustion derivatives in a lean 2,5-dimethylfuran flame

Low-pressure (4.0 kPa) premixed laminar 2,5-dimethylfuran (DMF)/oxygen/argon flame with an equivalence ratio of 0.8 was studied with tunable vacuum ultraviolet synchrotron radiation photoionization and molecular-beam mass spectrometry. Photoionization mass spectra of DMF/O₂/Ar flame and the photoionization efficiency curves of the combustion intermediates were recorded.Ionization energies of the combustion intermediates were obtained from the photoionization efficiency curves. Structures of the combustion intermediates, including the oxidation products and the higher derivatives of DMF, are identified by comparing the measured ionization energies with those reported in literatures or those calculated with quantum chemistry methods. The formation and consumption of DMF and its primary combustion derivatives are proposed based on the combustion intermediates identified.