Ruthenium tetroxide oxidation of immature sulfur-rich kerogens from the N枚rdlinger Ries (southern Germany)

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• 作者：Assem O. Barakat^a ; ^{asem.barakat@alex-sci.edu.eg} ; Barbara M. Scholz-Bö ; ttcher^b ; Jü ; rgen Rullkö ; tter^b
• 关键词：Ruthenium tetroxide oxidation ; Nö ; rdlinger Ries ; Kerogen ; Chemical degradation ; Sulfur-rich macromolecules
• 刊名：Fuel
• 出版年：2012
• 期刊代码：33_00162361
• 类别：ce
• 出版时间：June, 2012
• 卷：96
• 期：Complete
• 页码：176-184
• 文件大小：559 K

摘要

Ruthenium tetroxide oxidation was applied to sulfur-rich kerogens from the N枚rdlinger Ries, southern Germany, to provide complementary structural information about the nature of alkyl substituents attached to aromatic moieties. The oxidation products contained series of straight-chain monocarboxylic acids (C₈-C₂₉), 伪,蠅-dicarboxylic acids (C₇-C₂₆), isoprenoid acids (C₁₄-C₂₁, except C₁₈), non-isoprenoid branched acids (mainly iso and anteiso C₁₁-C₁₈ acids), 3尾-carboxysteroids (C₂₈-C₃₁) and steroid ketones (C₂₇-C₃₀). Furthermore, 4-hydroxy-4,8,12,16-tetramethylheptadecanoic acid 纬-lactone, 6,10,14-trimethylpentadecan-2-one, and 10-oxo-n-octadecanoic acid were identified. The oxidation products are discussed in terms of their original contribution to the macromolecular structure. The results support previous suggestions that alkyl-aryl ether groups are present in the kerogen, probably as a result of O-alkylation between phenols and aliphatic precursors. Of particular interest, however, is the identification of a predominant homologous series of 2-methyl n-alkanoic acid methyl esters (C₉-C₂₈) in one of the samples. The release of this scarcely reported series of branched acids points toward the specificity of RuO₄ oxidation revealing structural information on the alkyl chains substituting the aromatic moieties in the kerogen structure, and implies that some of the bound lipids were contributed by sulfate-reducing bacteria.