Abstract The combination of subcritical water and catalyst was proposed for oil shale extraction. The extraction of Huadian oil shale in FeCl2 solution was performed at 350 °C to evaluate the combined method. At 20 h, a high yield of bitumen 1 (the bitumen discharged from shale matrix) was obtained in FeCl2 solution with an optimal concentration of 0.08 mol/L, which was 50.5% higher than that obtained in pure water. The bitumen 1 reached a maximum yield of 18.98 wt% at 40 h in subcritical FeCl2 solution and 19.14 wt% at 70 h in subcritical water, respectively. The time needed for a maximum yield of bitumen 1 was reduced by 43% after the addition of FeCl2. The results indicated that FeCl2 played an important role in the promotion of the cleavage of hetero-atomic bonds in kerogen and the transportation of bitumen 2 (the bitumen remaining in the shale matrix) in the shale matrix. It showed the addition of FeCl2 did not significantly affect the variation trends of the relative content of the major components in bitumen 1 and bitumen 2 with the time. The subcritical FeCl2 solution extraction should be a highly efficient method for in situ extraction of oil shale.

中文翻译：

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亚临界FeCl2溶液萃取华电油页岩

摘要 提出了亚临界水和催化剂联合用于油页岩的提取。华甸油页岩在 FeCl2 溶液中的提取在 350 °C 下进行，以评估组合方法。在 20 h 时，在 FeCl2 溶液中获得了高产率的沥青 1（从页岩基质中排出的沥青），其最佳浓度为 0.08 mol/L，比纯水中获得的沥青 1 高 50.5%。沥青 1 在亚临界 FeCl2 溶液中 40 小时达到 18.98 重量％的最大产率，在亚临界水中 70 小时达到 19.14 重量％。添加 FeCl2 后，沥青 1 的最大产率所需的时间减少了 43%。结果表明，FeCl2 对促进干酪根中杂原子键的断裂和页岩基质中沥青 2（残留在页岩基质中的沥青）的运输起到了重要作用。说明FeCl2的加入对沥青1和沥青2中主要组分相对含量随时间的变化趋势没有显着影响。亚临界 FeCl2 溶液萃取应该是一种高效的油页岩原位萃取方法。