Current trends in the pyrolysis of oil shale: A review

Strizhakova, Yu. A.; Usova, T. V.

doi:10.3103/s0361521908040022

Cited by 41 publications

(12 citation statements)

References 23 publications

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“…Several tools have been used to optimize the energy potential of oil shale pyrolysis, including thermogravimetric analysis (TGA), which allows to study in detail the thermal kinetics of different processes (Khraisha and Shabib 2002;Tiwari and Deo 2012a;Wang et al 2014). For the most part, the main mass losses monitored during non-isothermal oil shale pyrolysis consist of moisture removal at low temperatures, kerogen degradation at around 200 °C-600 °C and clays and carbonates minerals decomposition at above 700 °C (Maaten et al 2016;Strizhakova and Usova 2008).…”

Section: Introductionmentioning

confidence: 99%

Type I kerogen-rich oil shale from the Democratic Republic of the Congo: mineralogical description and pyrolysis kinetics

et al. 2019

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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.

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Section: Introductionmentioning

confidence: 99%

Type I kerogen-rich oil shale from the Democratic Republic of the Congo: mineralogical description and pyrolysis kinetics

et al. 2019

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“…The characteristics of oil shale have been influenced by many factors, including geological conditions, formation age, and the degree of metamorphism of the organic matter therein. The structural morphology of minerals and organic matter in oil shale undergo significant changes, which significantly affect the pyrolytic processing of oil shale and the corresponding products [6][7][8]. Oil shale is mainly composed of two parts: organic and inorganic.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research of the Pyrolytic Properties and Mineral Components of Bogda Oil Shale, China

Zhang¹,

Liu²,

Kang³

et al. 2018

Oil Shale

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The purpose of this paper was to investigate the pyrolysis properties and mineral structures of Bogda oil shale, Xinjiang, China. To this end, techniques such as Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and thermogravimetry-mass spectrometry (TG-MS) were used. The results showed that oil shale was rich in clay minerals, quartz, calcite, frondelite and pyrite. Aliphatic hydrocarbons were mainly dominant in the functional groups contained in the organic material of oil shale whose semi-coke possessed diverse structures of polycyclic aromatic hydrocarbons. The pyrolysis process of Bogda oil shale was conducted in three stages: from room temperature to 320 °C, 320 °C to 630 °C, and 630 °C to 800 °C. The pyrolysis was the most intensive in the temperature range of 320-630 °C. The mass loss of oil shale in this temperature range accounted for 70% of the total mass loss. The volatile materials were pyrolysed rapidly. The main gaseous pyrolysis products included H 2 O, CO 2 , H 2 , CH 4 , and some lower alkanes.

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“…Oil shale, as an important alternative energy for its reserves large and comprehensive utilization's means diverse, attracts wide the world's attentions [1]. Oil shale can be combusted directly to generate electricity and also be transferred into fuel oil by distillation.…”

Section: Introductionmentioning

confidence: 99%

H2S Evolution during Oil Shale Pyrolysis

Zheng

Wang

et al. 2010

2010 Asia-Pacific Power and Energy Engineering Conference

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H2S evolution during different oil shale samples pyrolysis was studied in fixed bed in the nitrogen atmosphere. The results show the H2S evolution is influenced by pyrolysis conditions and properties of oil shale. The yield of H2S released for two samples had a marked change at 300-600℃ of final temperature and 5-50℃/min of heating rate. Both the H2S yields of two samples increase with grain size increasing. While the H2S yields of Huadian oil shale was far more than that of Wangqing under same pyrolysis conditions, which may be attributed to low sulfur content and high ash content of Wangqing oil shale. It is shown that the curve of H2S escaped for Wangqing has a single wave only below 550℃, while two successive waves for Huadian oil shale occur at 440℃ and 590℃ respectively. The reasons of such results may be attributed to different distribution of organic and pyrite sulfur between Wangqing oil shale and Huadian oil shale. At 600 , about 10% sulfur is released from Wangqing oil shale, while about 25% sulfur fixed in semi-coke; for Huadian oil shale, about 8% sulfur is distributed in gas while 37% in simi-coke.

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Current trends in the pyrolysis of oil shale: A review

Cited by 41 publications

References 23 publications

Type I kerogen-rich oil shale from the Democratic Republic of the Congo: mineralogical description and pyrolysis kinetics

Type I kerogen-rich oil shale from the Democratic Republic of the Congo: mineralogical description and pyrolysis kinetics

Experimental Research of the Pyrolytic Properties and Mineral Components of Bogda Oil Shale, China

H2S Evolution during Oil Shale Pyrolysis

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