Barakat, Assem O. and Scholz-Böttcher, Barbara M. and Rullkötter, Jürgen (2013) Structural investigations of Monterey kerogen by sequential chemical degradation. Fuel, 104. pp. 788-797. ISSN 0016-2361

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Two successive degradation steps involving Na2Cr2O7/AcOH and RuO4 were carried out on a Type II-S kerogen from the Miocene Monterey Formation (California) after pre-saponification of the ester bonds by KOH/MeOH treatment. Detailed gas chromatography (GC) and gas chromatography–mass spectrometry (GC–MS) analysis of the soluble acids revealed significant qualitative and quantitative variation of the various types of products obtained from the two different degradation steps. Maleimides (lH-pyrrole- 2,5-diones), dominated by Me,Et-maleimide, were the major degradation products released by Na2Cr2O7/AcOH oxidation indicating that their precursors, probably tetrapyrrole pigments, occur etheras well as sulfur-bound in the kerogen. On the other hand, a scarcely reported homologous series of 2-methyl-n-alkanoic acids (C8–C27) was identified as the most prominent series of carboxylic acids obtained after RuO4 oxidation. The results support the high specificity of the RuO4 oxidation method in revealing information on the nature of the alkyl chains substituting the aromatic moieties in the kerogen structure and point to the presence of aryl–alkyl ether groups in the kerogen. The significance of the lipid composition of the kerogen is further discussed in terms of biomarker information and their original attachment to the macromolecular structure.

Item Type: Article
Uncontrolled Keywords: Monterey kerogen, Chemical degradation, Pyrroles, Thiophene carboxylic acids, Structural investigation
Subjects: Science and mathematics
Science and mathematics > Chemistry
Science and mathematics > Earth sciences and geology
Divisions: Faculty of Mathematics and Science > Institute for Chemistry and Biology of the Marine Environment (ICBM)
Date Deposited: 28 Feb 2014 11:41
Last Modified: 28 Feb 2014 11:41
URN: urn:nbn:de:gbv:715-oops-18773
DOI: 10.1016/j.fuel.2012.06.026

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