A comprehensive kinetics study on non-isothermal pyrolysis of kerogen from Green River oil shale

Kuang, Wuqi; Lu, Meijuan; Yeboah, Isaac; Qian, Gang; Duan, Xuezhi; Yang, Jia; Chen, De; Zhou, Xinggui

doi:10.1016/j.cej.2018.10.212

Cited by 52 publications

(25 citation statements)

References 70 publications

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“…Further increase of activation energy from α = 0.7 to 0.98 may relate to releasing gases and lighter hydrocarbons and decomposition of bitumen followed by coking reaction. 54 This mechanism can be seen taking place due to the occurrence of aromatic compounds corresponding to α = 0.7 to 0.98 with sharp increment at α = 0.8 (Figure 3B) and continuous evolution of CH 4 from α = 0.4 to 0.9 and subsequently decrease from 0.9 to 0.98.…”

Section: Determination Of Apparent Activation Energy Valuesmentioning

confidence: 87%

Compositional and kinetic study of thermal degradation of kerogen using TG‐FTIR, NMR, and microscopic study

Baruah

Tiwari

2021

AIChE Journal

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Understanding the thermal maturation mechanism of kerogen has both industrial and scientific significance. Here, kerogen extracted from Indian oil shale of Upper Assam basin is subjected to TG-FTIR analysis to study the thermal decomposition behavior of isolated kerogen and compared with oil shale sample. Kinetic study of kerogen was performed on thermogravimetric data using isoconversional methods. The mean apparent activation energy values were found in the range of 219 to 236 kJ/mol.The reaction models were identified as first-order and A2 nucleation models. The obtained kinetic parameters were validated by reconstruction of conversion profiles.Comparison of oil derived from kerogen with shale oil, and solvent-extracted bitumen using NMR analysis showed that kerogen initially matures into bitumen, and thereafter, gets converted to oil and gas in the presence of inherent minerals. The predicted degradation mechanisms of kerogen from the parent oil shale sample were examined using microscopic study.

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Section: Determination Of Apparent Activation Energy Valuesmentioning

confidence: 87%

Compositional and kinetic study of thermal degradation of kerogen using TG‐FTIR, NMR, and microscopic study

Baruah

Tiwari

2021

AIChE Journal

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“…Therefore, since the IT-KAS activation energy is found between the mean energy values of F1 and F2 models (164.1 kJ mol −1 and 247.9 kJ mol −1 , respectively) compared to other models (Table 4), the mechanism that describes the pyrolysis kinetics of CK oil shale is more probably following the Fn model, with n value ranging from 1 to 2. This Fn model has also been reported to describe the mechanism of many oil shales' pyrolysis or combustion (Kök and Pamir 2000;Kuang et al 2018;Ma and Li 2018).…”

Section: Determination Of Reaction Mechanismmentioning

confidence: 88%

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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“…The water bath temperature of the extraction was 48°C. The complete extraction of residual oil was guaranteed by the observation that solvent in the siphon and thimble-holder becomes colorless [45]. The Soxhletextracted samples were placed in beakers and dried under a fume hood.…”

Section: Soxhlet Extractionmentioning

confidence: 99%

Pore Properties of the Lacustrine Shale in the Upper Part of the Sha-4 Member of the Paleogene Shahejie Formation in the Dongying Depression in East China

et al. 2021

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Lacustrine shales hold a huge potential oil resource in China. Pore properties (pore volume, diameter, specific surface area, and fractal dimensions) and their relationships with geological factors (mineralogy, insoluble organic carbon, burial depth, and vitrinite reflectance) are critical for evaluating shale oil resource. However, the factors controlling pores for lacustrine shale oil remain unclear, as the relationships between pore properties of Soxhlet-extracted samples and geological factors have not been studied using multivariate analytical methods. In this paper, the samples from the lacustrine shale in the upper part of the Sha-4 Member of the Paleogene Shahejie Formation in the Dongying Depression were tested with a set of experiments including Soxhlet (solvent) extraction, X-ray diffraction mineral analysis, insoluble organic carbon, vitrinite reflectance, and low-pressure CO2 and N2 adsorption experiments. The micromesopore volume varies from 0.003 cm3/g to 0.045 cm3/g. The relationships of pore properties with geological factors were studied with partial least square regression analysis (PLSR analysis, a powerful multivariate regression analysis). The results of the PLSR analyses indicate that clay minerals and carbonates are two key factors affecting the pore properties of the lacustrine shale. Compared with marine shales, more clay minerals in the lacustrine shale make them become more important for controlling pores than organic matter. The PLSR results also illustrate that the shale with higher pore volume contains more clay minerals and fewer carbonates and thus is unfavorable for hydraulic fracturing. Therefore, the shale with high micromesopore volume may be unfavorable for shale oil production. The shale with the modest micromesopore volume (~0.036 cm3/g), relatively high content of brittle minerals (~71 wt%), and low clay mineral content (~29 wt%) is conducive to both oil storage and hydraulic fracturing for the development of the Es4U shale oil in the Dongying Depression in East China.

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A comprehensive kinetics study on non-isothermal pyrolysis of kerogen from Green River oil shale

Cited by 52 publications

References 70 publications

Compositional and kinetic study of thermal degradation of kerogen using TG‐FTIR, NMR, and microscopic study

Compositional and kinetic study of thermal degradation of kerogen using TG‐FTIR, NMR, and microscopic study

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

Pore Properties of the Lacustrine Shale in the Upper Part of the Sha-4 Member of the Paleogene Shahejie Formation in the Dongying Depression in East China

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