Petroleum Science >2020,??Issue 1:??1-13 DOI: https://doi.org/10.1007/s12182-019-00384-2
Type I kerogen-rich oil shale from the Democratic Republic of the Congo: mineralogical description and pyrolysis kinetics Open?Access
文章信息
作者：Rajaa BouamoudEly, Cheikh Moine, Raphaèl Mulongo-Masamba, Adnane El Hamidi, Mohammed Halim, Said Arsalane
作者單位：
Laboratory of Nanomaterials, Nanotechnologies and Environment, Center of Science of Materials, Faculty of Sciences, Mohammed V University in Rabat, Rabat, Morocco; Research Unit of Materials Chemistry, Faculty of Science and Technology, UNA, Nouakchott, Mauritania; Department of Geochemistry, Center for Geological and Mining Research (CGMR), Kinshasa, Democratic Republic of the Congo
投稿時間：2019-07-24
引用方式：Bouamoud, R., Moine, E.C., Mulongo-Masamba, R. et al. Pet. Sci. (2019). https://doi.org/10.1007/s12182-019-00384-2
文章摘要
The Democratic Republic of the Congo holds important reserves of oil shale which is still under geological status. Herein, the characterization and pyrolysis kinetics of type I kerogen-rich oil shale of the western Central Kongo (CK) were investigated. X-ray diffraction, Fourier-transform infrared spectroscopy and thermal analysis (TG/DTA) showed that CK oil shale exhibits a siliceous mineral matrix with a consistent organic matter rich in aliphatic chains. The pyrolysis behavior of kerogen revealed the presence of a single mass loss between 300 and 550 °C, estimated at 12.5% and attributed to the oil production stage. Non-isothermal kinetics was performed by determining the activation energy using the iterative isoconversional model-free methods and exhibits a constant value with E?=?211.5?±?4.7 kJ mol?1. The most probable kinetic model describing the kerogen pyrolysis mechanism was obtained using the Coats–Redfern and Arrhenius plot methods. The results showed a unique kinetic triplet confirming the nature of kerogen, predominantly type I and reinforcing the previously reported geochemical characteristics of the CK oil shale. Besides, the calculation of thermodynamic parameters (ΔH*, ΔS* and ΔG*) corresponding to the pyrolysis of type I kerogen revealed that the process is non-spontaneous, in agreement with DTA experiments.
關鍵詞
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Type I kerogen, Pyrolysis kinetics, Isoconversional methods, Mineralogy, Central Kongo oil shale