国家冰川冻土沙漠科学数据中心

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名称	Remarkable fractionation of hydrogen isotope (δD) of hydrocarbon during fast aromatization process: Insights from the pyrolysis experiments of n-butylcyclohexane
科技资源标识	CSTR:11738.14.NCDC.XDA14.PP4424.2024
DOI	10.1021/acsearthspacechem.8b00111
数据共享方式	开放下载
摘要	Hydrocarbon aromatization involves the cleavage of multiple C− H bonds and the dehydrogenation of aliphatic rings, with a resultant fractionation of stable hydrogen between aromatic hydrocarbons and their counterpart precursors. Despite this understanding, there is still the paucity of studies on the hydrogen isotope (δD) fractionation of aromatic compounds and the δD fractionation characteristics during the aromatization process of hydrocarbons. In the present study, n-butylcyclohexane (BCH) was thermally pyrolyzed in a closed gold tube system at different time intervals to investigate the aromatization process of the monoaliphatic ring hydrocarbon. The δD evolutions of toluene (Tol) and methylcyclohexane (MCH) from the BCH pyrolysates were also examined, with the aim of studying the cleavage behavior of the C−H bond at the aliphatic ring. The results of the 24 h BCH pyrolysates showed that toluene was strongly enriched with 2 H, whereas MCH was heavily depleted, with ΔδDTol−MCH (δDTol − δDMCH) being 162.3‰ [Vienna Standard Mean Ocean Water (VSMOW)]. In comparison to the initial hydrogen isotope of BCH, ΔδDMCH−BCH and ΔδDTol−BCH were −46.5 and 115.8‰, respectively. With an increasing pyrolysis time, the degree of δD fractionation between Tol and MCH gradually mitigated. It is speculated that the dehydrogenation of the aliphatic ring started with more possibility of cracking the C−1 H bond and then having more C−2 H being retained in the aromatic ring at the initial stage of hydrocarbon aromatization, leading to the strong δD fractionation of the aromatic hydrocarbon. This observation is quite instructive, in that fast aromatization of the hydrocarbon caused a remarkable hydrogen isotope fractionation, which may play a significant role in the strong 2 H enrichment of aromatic hydrocarbons generated from a fast and high-temperature thermal event, such as a meteorite when passes through the atmosphere
学科分类	170.50
关键词	fast aromatization hydrogen isotope fractionation pyrolysis experiments meteorite PAHs geochemical implication
作者	Bin Jiang
数据量	3.1 MiB
论文类型：	journal
论文网址：	https://pubs.acs.org/doi/10.1021/acsearthspacechem.8b00111
期刊名称：	ACS Earth and Space Chemistry
出版时间：	2018-12-20

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数据引用

Bin Jiang. Remarkable fractionation of hydrogen isotope (δD) of hydrocarbon during fast aromatization process: Insights from the pyrolysis experiments of n-butylcyclohexane. 国家冰川冻土沙漠科学数据中心(http://www.ncdc.ac.cn), 2024. https://cstr.cn/CSTR:11738.14.NCDC.XDA14.PP4424.2024.

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本作品采用知识共享署名 4.0 国际许可协议进行许可。

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项目信息详情

项目名称：深层油气形成与分布预测
项目编号：XDA14010000
项目类别：中国科学院战略性先导科技专项（A类）