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dc.creatorVukovic, Nikola
dc.creatorZivotic, Dragana
dc.creatorMendonca Filho, Joao Graciano
dc.creatorKravic-Stevovic, Tamara
dc.creatorHamor-Vido, Maria
dc.creatorMendonca, Joalice de Oliveira
dc.creatorStojanović, Ksenija
dc.date.accessioned2018-11-22T00:35:47Z
dc.date.available2018-11-22T00:35:47Z
dc.date.issued2016
dc.identifier.issn0166-5162
dc.identifier.urihttp://cherry.chem.bg.ac.rs/handle/123456789/2062
dc.description.abstractThe artificial maturation changes of the humic coal organic matter (OM) from late diagenesis to the semianthracite stage of coalification were investigated using the closed-system pyrolysis. Two extracted coal samples, a subbituminous coal 26C (with a random vitrinite reflectance Rr = 0.42%) and a high volatile bituminous coal 30C (Rr = 0.56%), were pyrolysed during 4 hat two different temperatures, 250 degrees C and 400 degrees C. The applied petrographic and organic geochemical analyses showed that the humic coal OM is sensitive to the artificial thermal stress. A good correlation between the changes in petrographic characteristics and the derived liquid products was observed. The contents of all vitrinite macerals, as well as total vitrinite, increased during the thermal maturation. The abundance of liptinite macerals decreased during the maturation and they practically disappeared after 4 h of the pyrolysis at 400 degrees C. The total inertinite contents increased after the pyrolysis at 250 degrees C, yet to be decreased after the pyrolysis at 400 degrees C. The content of organic carbon increased from coals to the solid residues at 400 degrees C, whereas the contents of total hydrogen and sulphur decreased. The yields of gases, liquid products and solid residues at respective temperatures were very similar for both coals, regardless of the rank. As expected, the pyrolysis at 400 degrees C gave higher gas and liquid yields than at 250 degrees C. Regarding the liquid pyrolysates, more pronounced changes were observed in the distribution of aromatic compounds than in saturated biomarkers. The distributions of the aromatics indicate that apart from cracking and isomerisation (the formation of thermodynamically more stable isomers), the reactions of dehydrocyclization, condensation (the formation of more stable conjugated systems) and aromatization, as well as reactions involving H2S, elemental sulphur and reactive phenyl radicals released during the pyrolysis, also play an important role. It was shown that bentonitic clay plays a more important role in the subsequent aromatization of the OM than the initial maturity of the coal OM. n-Alkane parameters were useful at lower maturities (up to similar to 0.75% Rr), whereas sterane, naphthalene and phenanthrene maturity ratios are applicable at higher maturities ( gt 0.75% Rr). Hopane parameters showed variable sensitivities over the investigated maturity range (0.5-1.8% Rr). The most sensitive maturity parameters in the wide range of the humic OM maturity (0.5-1.8% Rr) are vitrinite reflectance, phenylnaphthalene ratio, methylchrysene index 2 and a parameter proposed in this study, based on the distribution of methylfluorenes (MF): (2- + 3-MF) / (1- + 4-MF). Generally, maturity parameters based solely on the isomerisation reactions of alkylaromatics, which do not include alkylation/dealkylation processes, are more appropriate for the humic OM, particularly at higher maturities. (C) 2016 Elsevier B.V. All rights reserved.en
dc.publisherElsevier Science Bv, Amsterdam
dc.rightsrestrictedAccess
dc.sourceInternational Journal of Coal Geology
dc.subjectHumic coal organic matteren
dc.subjectMaturityen
dc.subjectPyrolysisen
dc.subjectMaceralsen
dc.subjectBiomarkersen
dc.subjectAromatic compoundsen
dc.titleThe assessment of maturation changes of humic coal organic matter - Insights from closed-system pyrolysis experimentsen
dc.typearticle
dc.rights.licenseARR
dcterms.abstractМендонца Филхо, Јоао Грациано; Стојановић, Ксенија; Зивотиц, Драгана; Кравиц-Стевовиц, Тамара; Вуковиц, Никола; Хамор-Видо, Мариа; Мендонца, Јоалице де Оливеира;
dc.citation.volume154
dc.citation.spage213
dc.citation.epage239
dc.identifier.wos000371554300018
dc.identifier.doi10.1016/j.coal.2016.01.007
dc.citation.other154: 213-239
dc.citation.rankaM21
dc.type.versionpublishedVersionen
dc.identifier.scopus2-s2.0-84955238090
dc.identifier.rcubKon_3018


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