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Mechanism of kerogen pyrolysis in terms of chemical structure transformation
Lai, Dengguo1,2; Zhan, Jin-Hui1; Tian, Yong1,2; Gao, Shiqiu1; Xu, Guangwen1,3
Source PublicationFUEL

This article presents an overview on carbon chemical structure transformation to understand kerogen thermal decomposition based on the chemical structure of kerogen. Formation of kerogen is highlighted to distinguish the typical types of kerogen containing in oil shale and coal. The oil production potential for oil shale and coal is found to little correlate with their organic amounts but to depend on the quality or chemical structure of organic matters. Aliphatic and aromatic carbons in kerogen are correlative with the yield of oil and carbon residue from Fischer Assay retorting, respectively. The aliphatic carbon moieties largely produce oil and gas, while aromatic carbon portion is apt to be converted directly to carbon residue during kerogen pyrolysis process. On this basis, an updated lumped mechanism model is proposed for viewing kerogen pyrolysis and provides a basis for understanding the transformation of carbon chemical structures. Further quantization and analysis conclude that: 1) 10-20% aliphatic carbon leaves in carbon residue as methyl groups and methylene bridges attached to aromatic rings, 2) 45-80% aliphatic carbon is directly distillated into oil, and 3) 15-40% aliphatic carbon is aromatized into aromatic carbon. The aromatization degree of aliphatic carbon varies with secondary reactions and its intrinsic chemical structure (alkyl chains, naphthenic and hydroaromatic hydrocarbons). Thus, the article justifies that primary pyrolysis determines the potentially maximal oil yield according to original carbon chemical structure, while the subsequent secondary reactions should be selective and minimized to determine the final oil yield and quality. (C) 2017 Elsevier Ltd. All rights reserved.

KeywordPyrolysis Kerogen Chemical Structure Mechanism Oil Shale Coal Tar Shale Oil
WOS HeadingsScience & Technology ; Technology
Indexed BySCI
WOS KeywordOil-shale Pyrolysis ; Nuclear Magnetic-resonance ; Solid Heat Carrier ; State C-13 Nmr ; Coal Pyrolysis ; Fixed-bed ; Secondary Reactions ; Gas Evolution ; Moving-bed ; Internals
WOS Research AreaEnergy & Fuels ; Engineering
WOS SubjectEnergy & Fuels ; Engineering, Chemical
Funding OrganizationNational Basic Research Program of China(2014CB744303) ; National Natural Science Foundation of China(91534125)
WOS IDWOS:000398678900049
Citation statistics
Cited Times:22[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Southwest Res & Design Inst Chem Ind Co Ltd, Chengdu 610225, Sichuan, Peoples R China
Recommended Citation
GB/T 7714
Lai, Dengguo,Zhan, Jin-Hui,Tian, Yong,et al. Mechanism of kerogen pyrolysis in terms of chemical structure transformation[J]. FUEL,2017,199:504-511.
APA Lai, Dengguo,Zhan, Jin-Hui,Tian, Yong,Gao, Shiqiu,&Xu, Guangwen.(2017).Mechanism of kerogen pyrolysis in terms of chemical structure transformation.FUEL,199,504-511.
MLA Lai, Dengguo,et al."Mechanism of kerogen pyrolysis in terms of chemical structure transformation".FUEL 199(2017):504-511.
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