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Low temperature air oxidation of n-alkanes in the presence of Na-smectite

机译:钠蒙脱石存在下正构烷烃的低温空气氧化

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This paper is the continuation of a study concerning the catalytic effects of clay on organic matter and especially n-alkanes during oxidation carried out at low temperature. The influences of clay minerals were investigated to understand their role better during natural oxidation of organic matter. n-Alkanes oxidation experiments in presence of Na-smectite were carried out at 100℃ during 512 h and reveal an important production of oxygen-bearing molecules to the detriment of initial n-alkanes. Thus, Na-smectite allows to initiate the auto-oxidation of n-alkanes due to its chemical (charged sheets) and/or physical (high specific area) properties. The evolution of oxygen-bearing molecules distribution enables to distinguish two competitive chemical pathways. On one hand, alcohols and ketones are produced with an aliphatic chain length similar to the starting n-alkanes. On the other hand, aliphatic chain cleavages occur and principally produce 1-alcohols, 2-ketones, carboxylic acids and 3-substitued γ-lactones. These oxygen-bearing compounds are more and more preponderant and evidence the fact that cleavage mechanisms become progressively dominant.
机译:本文是关于低温下粘土在氧化过程中对有机物,尤其是正构烷烃的催化作用的研究的延续。研究了粘土矿物的影响,以更好地了解其在有机物自然氧化过程中的作用。在100℃下于512 h内在Na-蒙脱石存在下进行正构烷烃氧化实验,结果表明,该构图中重要的含氧分子产物对初始的正构烷烃有害。因此,钠蒙脱石由于其化学(带电板)和/或物理(高比表面积)性质而允许引发正构烷烃的自氧化。含氧分子分布的演变能够区分两种竞争性化学途径。一方面,生产的醇和酮的脂族链长与起始正构烷烃相似。另一方面,发生脂族链断裂,并且主要产生1-醇,2-酮,羧酸和3-取代的γ-内酯。这些含氧化合物越来越占优势,证明了裂解机理逐渐占主导地位的事实。

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