دورية أكاديمية
Comparative study of a vitrinite-rich and an inertinite-rich Witbank coal (South Africa) using pyrolysis-gas chromatography
| العنوان: | Comparative study of a vitrinite-rich and an inertinite-rich Witbank coal (South Africa) using pyrolysis-gas chromatography |
|---|---|
| المؤلفون: | Ofentse M. Moroeng, Vimbai Mhuka, Mathew M. Nindi, R. James Roberts, Nicola J. Wagner |
| المصدر: | International Journal of Coal Science & Technology, Vol 6, Iss 4, Pp 621-632 (2019) |
| بيانات النشر: | SpringerOpen, 2019. |
| سنة النشر: | 2019 |
| المجموعة: | LCC:Mining engineering. Metallurgy |
| مصطلحات موضوعية: | Py-TD-GC-TOFMS, Main Karoo Basin, Pyrolysis products, 13C CP-MAS SS NMR, Molecular chemistry, Phenolics, Mining engineering. Metallurgy, TN1-997 |
| الوصف: | Abstract This study aims to compare iso-rank vitrinite-rich and inertinite-rich coal samples to understand the impact of coal-forming processes on pyrolysis chemistry. A medium rank C bituminous coal was density-fractionated to create a vitrinite-rich and an inertinite-rich sub-sample. The vitrinite-rich sample has 83 vol% total vitrinite (mineral-matter-free basis), whereas the inertinite-rich counterpart has 66 vol% total inertinite. The vitrinite-rich sample is dominated by collotelinite and collodetrinite. Fusinite, semifusinite, and inertodetrinite are the main macerals of the inertinite-rich sample. Molecular chemistry was assessed using a pyrolysis gas chromatograph (py-GC) equipped with a thermal desorption unit coupled to a time of flight mass spectrometer (MS) (py-GC/MS) and solid-state nuclear magnetic resonance (13C CP-MAS SS NMR). The pyrolysis products of the coal samples are generally similar, comprised of low and high molecular weight alkanes, alkylbenzenes, alkylphenols, and alkyl-subtituted polycyclic aromatic hydrocarbons, although the vitrinite-rich sample is chemically more diverse. The lack of diversity exhibited by the inertinite-rich sample upon pyrolysis may be interpreted to suggest that major components were heated in their geologic history. Based on the 13C CP-MAS SS NMR analysis, the inertinite-rich sample has a greater fraction of phenolics, reflected in the py-GC/MS results as substituted and unsubstituted derivatives. The greater abundance of phenolics for the inertinite-rich sample may suggest a fire-related origin for the dominant macerals of this sample. The C2-alkylbenzene isomers (p-xylene and o-xylene) were detected in the pyrolysis products for the vitrinite-rich and inertinite-rich samples, though more abundant in the former. The presence of these in both samples likely reflects common source vegetation for the dominant vitrinite and inertinite macerals. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 2095-8293 2198-7823 |
| Relation: | http://link.springer.com/article/10.1007/s40789-019-00274-3; https://doaj.org/toc/2095-8293; https://doaj.org/toc/2198-7823 |
| DOI: | 10.1007/s40789-019-00274-3 |
| URL الوصول: | https://doaj.org/article/c9c4a74072314aad96abdbc6810f1fbe |
| رقم الأكسشن: | edsdoj.9c4a74072314aad96abdbc6810f1fbe |
| قاعدة البيانات: | Directory of Open Access Journals |
Find this article in full text from Springer Verlag. 
Full Text Finder | تدمد: | 20958293 21987823 |
|---|---|
| DOI: | 10.1007/s40789-019-00274-3 |