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Comparative study of a vitrinite-rich and an inertinite-rich Witbank coal (South Africa) using pyrolysis-gas chromatography

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International Journal of Coal Science & Technology 2019年第4期6卷 621-632页

作者： Ofentse M.Moroeng Vimbai Mhuka Mathew M.Nindi rjames roberts Nicola J.Wagner Department of Geology University of JohannesburgP.O.Box 524Auckland Park 2006South Africa Department of Chemistry College of Science Engineering and TechnologyUniversity of South AfricaP.O.Box 392Pretoria 0003South Africa Department of Geology University of PretoriaMineral Sciences BuildingPretoria 0002South Africa

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 *** vitrinite-rich sample has 83 vol% total vitrinite (mineral-matter-free basis),whereas the inertinite-rich counterpart has 66 vol% total *** vitrinite-rich sample is dominated by collotelinite and ***,semifusinite,and inertodetrinite are the main macerals of the inertinite-rich *** 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 *** lack of diversity exhibited by the inertinite-rich sample upon pyrolysis may be interpreted to suggest that major components were heated in their geologic *** 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 *** greater abundance of phenolics for the inertinite-rich sample may suggest a fire-related origin for the dominant macerals of this *** 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 *** presence of these in both samples likely reflects common source vegetation for the dominant vitrinite and inertinite rnacerals.

关键词： Py-TD-GC-TOFMS Main Karoo Basin Pyrolysis products 13C CP-MAS SS NMR Molecular chemistry Phenolics Xylene(C2-alkylbenzene)isomers

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