The enhancement on oil shale extraction of FeCl3 catalyst in subcritical water

The coupling effect of subcritical water and FeCl3 on the extraction of bulk Huadian oil shale was experimentally investigated. The results showed that, with the addition of FeCl3, the yield of shale oil in subcritical water extraction was enhanced by 58.5 % at 20 h and the time required for the max...

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Bibliographic Details
Published in:Energy (Oxford) 2022-01, Vol.238, p.121763, Article 121763
Main Authors: Kang, Shijie, Sun, Youhong, Qiao, Mingyang, Li, Shengli, Deng, Sunhua, Guo, Wei, Li, Jiasheng, He, Wentong
Format: Article
Language:English
Subjects:
Alkanes
Asphaltenes
Bitumens
Catalyst
Catalysts
Decomposition
Enhancement
Extraction
FeCl3
Ferric chloride
Iron
Kerogen
Mass transfer
Minerals
NMR
Nuclear magnetic resonance
Oil shale
Pyrolysis
Ring opening
Saturated hydrocarbons
Shale oil
Subcritical water
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Summary:The coupling effect of subcritical water and FeCl3 on the extraction of bulk Huadian oil shale was experimentally investigated. The results showed that, with the addition of FeCl3, the yield of shale oil in subcritical water extraction was enhanced by 58.5 % at 20 h and the time required for the maximum shale oil production was reduced by 43 %. The group compositions of shale oil and residual bitumen as well as the elemental analysis of residual kerogen revealed that FeCl3 could trigger the pyrolysis reaction networks of kerogen by promoting the cleavage of heteroatom bonds, and accelerate the decomposition of asphaltenes in residual bitumen. GC-MS analysis of n-alkanes in shale oil and residual bitumen showed that FeCl3 promoted the secondary cracking of saturated hydrocarbons in residual bitumen rather than in shale oil due to the adsorption of Fe3+ in shale matrix. The solid-state 13C NMR analysis of the residual kerogen indicated that the polycondensation of kerogen was inhibited and the ring-opening reaction of aromatic structure was promoted in the presence of FeCl3. In addition, the acidic FeCl3 solution induced the decomposition of carbonate minerals in oil shale matrix to provide additional mass transfer channels for the migration of bitumen products. [Display omitted] •Combination of subcritical water and catalyst is proposed for oil shale extraction.•The yield of shale oil was greatly enhanced with shortened extraction time.•FeCl3 promotes the decomposition of kerogen by breaking the heteroatom bonds.•FeCl3 promotes the further decomposition and migration of bitumen in shale matrix.
ISSN:0360-5442
1873-6785
DOI:10.1016/j.energy.2021.121763