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Study on evolution mechanism of the pyrolysis of chang 7 oil shale from Ordos basin in China

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  • Jiang, Haiyan
  • Liu, Shuai
  • Wang, Jiao
  • You, Yuan
  • Yuan, Shibao

Abstract

In-situ pyrolysis of oil shale is a sophisticated process that converts solid to gas and liquid. There is currently minimal research on the chemical mechanism of the production process. Using the Chang 7 oil shale in the Ordos basin in China as an example, thermogravimetry, scanning electron microscopy, and oil shale pyrolysis are used to examine the pyrolysis process, mineral composition, and pore structure characteristics of oil shale. The results indicate that organic matter is entirely pyrolyzed as temperature rises. The organic matter is first pyrolyzed into asphaltene at low temperatures (320–450 °C), and the C–H bond of hydrocarbon molecules break and recombine to generate lipid compounds. In the medium temperature pyrolysis (450–600 °C), a substantial amount of organic matter is pyrolyzed, ester compounds undergo pyrolysis reaction, and macromolecular alkanes undergo dehydrogenation and chain breaking reaction to form small molecule hydrocarbons and hydrogen. In the high temperature pyrolysis (600–700 °C), secondary cracking of organic matter pyrolysis products, dehydrogenation of naphthenic hydrocarbons, polymerization of some polycyclic aromatic hydrocarbons to generate colloidal, asphaltene and oil shale semi-coke. As temperature rises, clay minerals are completely pyrolyzed, and the number of micropores and microcracks in oil shale increases as well.

Suggested Citation

  • Jiang, Haiyan & Liu, Shuai & Wang, Jiao & You, Yuan & Yuan, Shibao, 2023. "Study on evolution mechanism of the pyrolysis of chang 7 oil shale from Ordos basin in China," Energy, Elsevier, vol. 272(C).
    • Handle: RePEc:eee:energy:v:272:y:2023:i:c:s0360544223004917
    DOI: 10.1016/j.energy.2023.127097
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    References listed on IDEAS

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    1. Li, Yi Z. & Wu, Shi X. & Yu, Xiao L. & Bao, Ri M. & Wu, Zhi K. & Wang, Wei & Zhan, Hong L. & Zhao, Kun & Ma, Yue & Wu, Jian X. & Liu, Shao H. & Li, Shu Y., 2017. "Optimization of pyrolysis efficiency based on optical property of semicoke in terahertz region," Energy, Elsevier, vol. 126(C), pages 202-207.
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