The enhancement on oil shale extraction of FeCl3 catalyst in subcritical water
The enhancement on oil shale extraction of FeCl3 catalyst in subcritical water
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DOI：
10.1016/j.energy.2021.121763
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发表时间：
2021-08-18
期刊：
影响因子：
9
通讯作者：
He, Wentong
中科院分区：
文献类型：
--
作者：
Kang, Shijie;Sun, Youhong;He, Wentong
实验研究了亚临界水与FeCl 3的耦合作用对桦甸油页岩本体萃取的影响。结果表明，添加FeCl 3后，页岩油的亚临界水萃取产率在20 h时提高了58.5%，达到最大产油量所需时间缩短了43%。页岩油和残余沥青的族组成以及残余干酪根的元素分析结果表明，FeCl 3通过促进杂原子键的断裂，引发干酪根的热解反应网络，加速了残余沥青中沥青质的分解。页岩油和残余沥青中正构烷烃的GC-MS分析表明，FeCl 3促进了残余沥青中饱和烃的二次裂解，而不是页岩油中饱和烃的二次裂解，这是由于Fe 3+在页岩基质中的吸附所致。固体碳13核磁共振分析表明，FeCl 3的存在抑制了干酪根的缩聚反应，促进了干酪根芳香结构的开环反应。此外，酸性FeCl 3溶液诱导油页岩基质中碳酸盐矿物的分解，为沥青产物的运移提供了额外的传质通道。(C)2021爱思唯尔有限公司保留所有权利。
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 C-13 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. (C) 2021 Elsevier Ltd. All rights reserved.