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本文利用同步辐射真空紫外光电离质谱技术对当量为0.75、1.00和1.79的低压预混乙基苯火焰进行了研究(P=4.0 kPa),得到了详细的中间体构成信息,并通过质谱分析,对不同当量下中间体浓度的变化进行了讨论。实验发现,乙基苯贫燃火焰中产生了大量的含氧中间体,而富燃火焰中产生了更多的碳氢化合物中间体,尤其是多环芳烃。苯、甲苯和苯乙烯在不同当量的火焰中均具有较强的信号,从而验证了文献中的乙基苯的三条主要解离通道。
In this paper, synchrotron radiation vacuum ultraviolet ionization mass spectrometry was used to study the low-pressure premixed ethylbenzene flames with equivalent weights of 0.75, 1.00 and 1.79 (P = 4.0 kPa). The detailed intermediate formation information was obtained and analyzed by mass spectrometry, The changes of the intermediate concentration under different equivalent weights were discussed. It has been found that a large amount of oxygen-containing intermediates are produced in the lean burn of ethylbenzene, and more hydrocarbon intermediates are produced in the rich flame, especially polycyclic aromatic hydrocarbons. Benzene, toluene and styrene have strong signals in different equivalent flame, which verifies the three main dissociation channels of ethylbenzene in the literature.