Determination of activation energy and pre-exponential factor for individual compounds on release from kerogen by a laboratory heating experiment.
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- Oba Masahiro
- Department of Chemistry, University of Tsukuba
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- Mita Hajime
- Department of Chemistry, University of Tsukuba
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- Shimoyama Akira
- Department of Chemistry, University of Tsukuba
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Kerogen recovered from Neogene Shinjo sediments was heated from room temperature to 800°C using a thermogravimetric analyzer (TG). Organic compounds released from kerogen during heating were trapped and analyzed by a gas chromatograph (GC)-mass spectrometer (MS). Among these compounds, benzene, hexane, toluene, phenol, heptane, and indene were selected to determine temperatures at which maximum release of these compounds occurred based on TG-MS peak profiles. This analysis was carried out using programmed heating rates (Hr) of 5, 10, 20, 30, and 60°C min-1 and five temperatures at peak tops (Tmax in absolute temperature) were determined for each compound. The plot of 1/Tmax vs. ln(Hr/(Tmax)2) for each compound showed a good straight line with a high correlation coefficiency. Accordingly, a mean activation energy (E0) and pre-exponential factor (A) at E0 for each compound on the release from kerogen were calculated, using the equation of the approximate method (or Gaussian E-distribution method) by Braun and Burnham (1987), ln(Hr/(Tmax)2) = −E0/RTmax + ln(AR/E0) where R is the ideal gas constant. The activation energies and pre-exponential factors of these compounds were in a range of 43.1 to 60.9 kcal/mol and of 3.56 × 1010 to 1.21 × 1016 s-1, respectively. The averages of the activation energies and pre-exponential factors obtained from the five kerogens had decomposition rates in order of indene > benzene, toluene > phenol > hexane, heptane, which indicated that hexane and heptane were more strongly bound to kerogen than the three aromatic hydrocarbons.
収録刊行物
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- GEOCHEMICAL JOURNAL
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GEOCHEMICAL JOURNAL 36 (1), 51-60, 2002
一般社団法人日本地球化学会
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詳細情報 詳細情報について
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- CRID
- 1390001204550329728
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- NII論文ID
- 130003904675
- 10016752731
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- NII書誌ID
- AA00654975
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- COI
- 1:CAS:528:DC%2BD38XitFyqtro%3D
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- ISSN
- 18805973
- 00167002
- http://id.crossref.org/issn/00167002
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- NDL書誌ID
- 6262465
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可