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A win-win method for generating carbon material precursors of carbon nanofibers from coal and CO2 and the associated mechanism
Fuel ( IF 6.7 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.fuel.2020.117712
Xin He , Tongtong Wang , Wenyang Lu , Kaidi Sun , Zaixing Huang , Alexander K. Goroncy , Ishara Ratnayake , Eric G. Eddings , Maohong Fan

Abstract Conventional fossil fuel utilization including coal burning process releases a large amount of carbon dioxide (CO2) to the atmosphere each year. Problems of CO2 emission have raised environmental concerns due to the possible link between CO2 and climate change. Thus, finding alternative technologies to utilize coal in an environmentally friendly manner and utilizing the captured CO2 are becoming extremely important. This research aims at fabricating high-value solid materials of carbon nanofibers (CNFs) with decent electrochemical capacitance from an ethanol and supercritical CO2 (EtOH-SCC) extraction method for producing tar from different coals. Tar yields of five coals were received between 26.85% and 37.18%. Gas chromatography-mass spectrometry proved that aliphatic esters comprised the highest percentages in each individual tar sample, ranging from 33.67% to 55.26%. The existence of aromatic structures in the tars were confirmed by Fourier-transform infrared spectra. Surface area of the fabricated carbon nanofiber was as high as 1263 m2 g−1, which significantly contributed to the high capacitance of the associated carbon nanofiber with the highest value to be 290.46F g−1 at 1 A g−1. Moreover, possible reaction mechanisms of ethanol and CO2 with coal were proposed based on the results from 1H NMR, 2H NMR and 13C NMR spectra when using deuterium-labeled ethanol and 13C labeled CO2 as reactants.

中文翻译:

煤与CO2双赢制备碳纳米纤维碳材料前驱体的方法及相关机理

摘要 传统的化石燃料利用,包括燃煤过程,每年都会向大气排放大量二氧化碳(CO2)。由于二氧化碳与气候变化之间可能存在联系,二氧化碳排放问题引发了环境问题。因此,寻找以环保方式利用煤炭和利用捕获的 CO2 的替代技术变得极为重要。本研究旨在通过乙醇和超临界 CO2 (EtOH-SCC) 提取方法制造具有良好电化学电容的碳纳米纤维 (CNF) 高价值固体材料,用于从不同煤中生产焦油。五种煤的焦油收率在 26.85% 和 37.18% 之间。气相色谱-质谱法证明,脂肪族酯在每个焦油样品中所占的百分比最高,范围从 33.67% 到 55.26%。傅里叶变换红外光谱证实了焦油中芳香结构的存在。制备的碳纳米纤维的表面积高达 1263 m2 g-1,这对相关碳纳米纤维的高电容具有重要贡献,在 1 A g-1 时最高值为 290.46F g-1。此外,当使用氘标记的乙醇和 13C 标记的 CO2 作为反应物时,基于 1H NMR、2H NMR 和 13C NMR 光谱的结果,提出了乙醇和 CO2 与煤的可能反应机制。制备的碳纳米纤维的表面积高达 1263 m2 g-1,这对相关碳纳米纤维的高电容具有重要贡献,在 1 A g-1 时最高值为 290.46F g-1。此外,当使用氘标记的乙醇和 13C 标记的 CO2 作为反应物时,基于 1H NMR、2H NMR 和 13C NMR 光谱的结果,提出了乙醇和 CO2 与煤的可能反应机制。制备的碳纳米纤维的表面积高达 1263 m2 g-1,这对相关碳纳米纤维的高电容具有重要贡献,在 1 A g-1 时最高值为 290.46F g-1。此外,当使用氘标记的乙醇和 13C 标记的 CO2 作为反应物时,基于 1H NMR、2H NMR 和 13C NMR 光谱的结果,提出了乙醇和 CO2 与煤的可能反应机制。
更新日期:2020-07-01
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