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Pathways toward PAH Formation during Fatty Acid and Triglyceride Pyrolysis.
The Journal of Physical Chemistry A ( IF 2.7 ) Pub Date : 2020-08-26 , DOI: 10.1021/acs.jpca.0c05515
Evguenii Kozliak 1 , Mark Sulkes 2 , Irina P Smoliakova 1 , Ibrahim Alhroub 2 , Brett Nespor 1 , Bin Yao 1 , Alena Kubátová 1
Affiliation  

Molecular beam mass spectrometry was used to follow model triglyceride pyrolysis with temperature. A selectively formed set of PAHs (276, 352, 444 amu) arose with increasing temperature. They were attributed to association of up to five C7–C8 sized fragments (observed in abundance by pyrolysis with gas chromatography), presumably due to their propensity to form stable benzyl radicals. Results were surprisingly similar regardless of triglyceride fatty acids (FAs), containing 0–2 C=C double bonds (14 to 18 carbon atoms). However, the absence of C=C double bonds shifted the process to higher temperatures. Shorter FA chains, particularly 14:0, enhanced generation of shorter size fragments, facilitating the alternate formation of nonselective PAH homology series. An increase in the length of the glass wool filled sample stage enhanced the formation of two more PAHs, 316 and 388 amu. They appear to involve the formation of indenyl in addition to benzyl radicals as key intermediates.

中文翻译:

脂肪酸和甘油三酸酯热解过程中形成PAH的途径。

使用分子束质谱法跟踪模型甘油三酸酯随温度的热解。随着温度的升高,出现了一组选择性形成的PAH(276、352、444 amu)。它们归因于最多五个C 7 –C 8的关联大小的碎片(通过气相色谱法热解法大量观察到),大概是由于它们倾向于形成稳定的苄基。无论甘油三酸酯脂肪酸(FAs)含有0–2 C = C双键(14至18个碳原子),结果都令人惊讶地相似。但是,C = C双键的不存在使该过程转向了更高的温度。较短的FA链(尤其是14:0)增强了较短尺寸片段的生成,从而促进了非选择性PAH同源序列的交替形成。玻璃棉填充样品台长度的增加,增加了另外两个PAHs 316和388 amu的形成。除苄基作为关键中间体外,它们似乎还涉及茚基的形成。
更新日期:2020-09-18
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