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

Zhang, H; Liu, J; Kang, Z; Yang, Ding

doi:10.3176/oil.2018.3.02

Cited by 6 publications

(2 citation statements)

References 17 publications

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“…The broad hump appearing at around 2θ = 20° of HD-K indicates that it contains more n -alkanes and naphthenes compared with the three other kerogens . The small sharp diffraction peaks evident in HD-K, FS-K, and DCG-K are attributed to pyrite. , The XRD patterns suggest that mostly minerals, such as quartz, calcite, montmorillonite, and kaolinite, are eliminated by the HCl/HF treatment. ,− …”

Section: Results and Discussionmentioning

confidence: 99%

Thermal Degradations and Processes of Four Kerogens via Thermogravimetric–Fourier-Transform Infrared: Pyrolysis Performances, Products, and Kinetics

et al. 2020

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The thermal upgrading of kerogen into fuels has scientific and industrial importance in oil shale utilization. In this study, multiple methods were applied to clarify the pyrolysis behaviors of four kerogens from the Huadian (HD) Basin, Fushun (FS) Basin, Luozigou (LZG) Basin, and Dachanggou (DCG) Basin oil shales. Two model-free isoconversional methods and a master plot were utilized to evaluate the kinetic parameters, and the Coats–Redfern method was used to verify the estimated kinetic results. The results indicated that all studied oil shales had very good hydrocarbon generation potential. HD, FS, and LZG oil shales could be described as type I kerogen, whereas DCG oil shale was type II1 kerogen with high aromatic content. HD kerogen featured a stronger polarity and contained more aliphatic structures compared with the three other samples, which induced the mass loss of its first stage at ∼38%, even larger than that of its second pyrolysis stage; the activation energies of the main pyrolysis stage of HD kerogen could also be divided clearly into two stages and in accordance with the thermogravimetric results. The thermal cracking processes of these FS, LZG, and DCG kerogens were mainly concentrated in the second pyrolysis stage, and the activation energies of FS and LZG kerogens did not show a considerable variation with conversion degrees. Moreover, DCG kerogen possessed the largest amount of aromatic structures which resulted in high yields of char, and the activation energies of the main pyrolysis stage of DCG kerogen was almost the largest, especially when the conversation rate was above 0.7. Evolution behaviors of oil and gas products at different temperatures during pyrolysis were related to the cleavage of chemical bonds in kerogen. CH4 and light C2+ aliphatic hydrocarbons were the typical gaseous products released from the main reaction stages of all four kerogens, and the evolving behavior of each typical gaseous product of four kerogens featured good similarity. The results showed that aliphatic and aromatic carbon contents in kerogen had a remarkable effect on its thermal characteristic and kinetic parameters, and the saturated aliphatic bonds and oxygen-containing bonds were easy to crack and had potentially low activation energy of reaction compared with those of aromatic bonds. Results of the master plot and Coats–Redfern methods verified that the Avrami–Erofeev kinetic model was the optimal model for the pyrolysis of the studied kerogens, thereby indicating that the four kerogens evolved under a similar genetic condition.

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Section: Results and Discussionmentioning

confidence: 99%

Thermal Degradations and Processes of Four Kerogens via Thermogravimetric–Fourier-Transform Infrared: Pyrolysis Performances, Products, and Kinetics

et al. 2020

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“…The pyrolysis of organic matter in oil shale can be divided into two obvious stages, and the occupation and blockage of intermediate products will affect the measurement of pore structure at the corresponding temperature (Lai et al 2016;Liu et al 2023). After 500 °C, the pyrolysis reaction of organic matter in oil shale is basically completed, and the changes in its pore structure are mainly caused by the thermal effects of temperature on inorganic minerals, such as the removal of crystal water from clay minerals, the decomposition of carbonate minerals, the thermal fracture caused by the expansion of quartz phase change, and the connection and collapse of pore structure at high temperature (Liu et al 2014;Zhang et al 2018); At this stage, the changes of pore structure of Xinjiang oil shale are closely related to its mineral composition.…”

Section: The Results Of Joint Characterizationmentioning

confidence: 99%

Study on the pore evolution of Xinjiang oil shale under pyrolysis based on joint characterization of LNTA and MIP

Liu,

Ma,

Wang

et al. 2023

Geomech. Geophys. Geo-energ. Geo-resour.

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During the in-situ exploitation of oil shale, the evolution of pore structure will affect the heat transfer medium and the transport capacity of products. In this study, using the oil shale from Jimsar region of Xinjiang, in combination with the low-temperature nitrogen adsorption experiment (LNTA) and high-pressure mercury injection experiment (MIP), the effect of temperature on evolution law of its pores during pyrolysis were analyzed according to the LNTA and MIP joint characterization results. The results show as follows: the change curve of oil shale porosity with pyrolysis final temperature in Xinjiang shows an “S” shape. The pore volume increases slightly before 300 °C, and it shows an increasing trend in the subsequent temperature range, with the mesopore volume change being the most noticeable. However, the increase slows down after 600 °C. The evolution of full-scale pores in the pyrolysis process of oil shale is reflected by the joint characterization of LNTA and MIP, which indicates that the temperature has a controlling effect on the evolution of pore, and provides basic theoretical support for how to improve the oil recovery rate of exploitation of oil shale.

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Calcined Oil Shale Semi-coke for Significantly Improved Performance Alginate-Based Film by Crosslinking with Ca2+

Hong

Ding

et al. 2022

J Polym Environ

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

Cited by 6 publications

References 17 publications

Thermal Degradations and Processes of Four Kerogens via Thermogravimetric–Fourier-Transform Infrared: Pyrolysis Performances, Products, and Kinetics

Thermal Degradations and Processes of Four Kerogens via Thermogravimetric–Fourier-Transform Infrared: Pyrolysis Performances, Products, and Kinetics

Study on the pore evolution of Xinjiang oil shale under pyrolysis based on joint characterization of LNTA and MIP

Calcined Oil Shale Semi-coke for Significantly Improved Performance Alginate-Based Film by Crosslinking with Ca2+

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