Air Oxidation of Eastern Oil Shales of Kentucky. Ii. The Effects of Ambient Autoxidation

Coburn, T.T.; Ganesan, P.

doi:10.1080/07377268308915317

Cited by 2 publications

(1 citation statement)

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“…Previous IR studies have established that there is good correlation between the intensity of alkyl bands (aliphatic C−H stretch) and oil yields of shales/kerogens. − It has been found that air oxidation and artificial weathering of shales gave lower oil yields − and produce oils that have shorter average aliphatic chain lengths, have higher oxygen contents, and are more aromatic . In a study on the preoxidation of oil shale, Khan 6 suggested that weathering/oxidation introduces oxygen cross-linking bridges, in the form of carboxyl groups, in the organic structures and thus ties up functional groups.…”

Section: Introductionmentioning

confidence: 99%

Study of the Oxidation of Oil Shale and Kerogen by Fourier Transform Infrared Emission Spectroscopy

1998

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Infrared emission spectroscopy has been used to monitor the chemical modifications taking place during the oxidation of bitumen-free Kerosene Creek shale, the bitumen-carbonate-free shale, and the bitumen-carbonate-silicate-free shale (kerogen). The samples were heated, in air, at temperatures in the range 50-700 °C at intervals of 50 °C. Oxidation of the samples at increasing temperatures showed a steady decrease in the signals due to aliphatic hydrocarbons (3000 cm -1 to 2700, 1460, and 1375 cm -1 ) as well as in the carbonyl/carboxyl signals (∼1710 cm -1 ) and the carbonyl signal at 1740 cm -1 , along with an increase in the anhydride signals at 1775 cm -1 and at ∼1850 cm -1 . Constant temperature (300 °C) oxidation produced a steady increase in the anhydride peaks at ∼1775 cm -1 and at ∼1850 cm -1 while the 1710 and 1740 cm -1 peaks slowly decreased. Of the mineral bands, those characteristic of carbonates totally disappeared at 700 °C while the other bands remained. The rate of decomposition of organic functionalities is generally fastest for the bitumen-carbonate-free sample. Analysis of the kinetic data clearly showed that the presence of carbonates and silicates lowered the activation energy for the oxidation of aliphatic C-H groups.

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