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A win-win method for generating carbon material precursors of carbon nanofibers from coal and CO_2 and the associated mechanism

机译：从煤和CO_2制备碳纳米纤维碳材料前体的双赢方法及相关机理

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摘要

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 m(2)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 H-1 NMR, H-2 NMR and C-13 NMR spectra when using deuterium-labeled ethanol and C-13 labeled CO2 as reactants.
机译：常规的化石燃料利用，包括燃煤过程，每年都会向大气释放大量的二氧化碳（CO2）。由于二氧化碳与气候变化之间可能存在联系，因此二氧化碳排放问题引起了环境方面的关注。因此，寻找替代技术以环境友好的方式利用煤炭并利用捕获的CO 2变得极为重要。这项研究的目的是用乙醇和超临界CO2（EtOH-SCC）提取方法制造具有适当电化学容量的碳纳米纤维（CNF）高价值固体材料，以从不同的煤中生产焦油。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，为33.67％至55.26％。通过傅立叶变换红外光谱证实了焦油中芳族结构的存在。制成的碳纳米纤维的表面积高达1263 m（2）g（-1），这极大地促进了相关碳纳米纤维的高电容，其最高值为1 A时为290.46F g（-1）。 g（-1）。此外，基于氘标记的乙醇和C-13标记的CO2作为反应物的H-1 NMR，H-2 NMR和C-13 NMR谱的结果，提出了乙醇和CO2与煤的可能反应机理。

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  • 来源
    《Fuel》 |2020年第jul15期|117712.1-117712.10|共10页
  • 作者

  • 作者单位

    Univ Wyoming Dept Petr & Chem Engn Laramie WY 82071 USA;

    Univ Wyoming Dept Petr & Chem Engn Laramie WY 82071 USA|China Univ Min & Technol Sch Chem Engn & Technol Xuzhou 221116 Jiangsu Peoples R China;

    Univ Wyoming Dept Chem Laramie WY 82071 USA;

    South Dakota Sch Mines & Technol Dept Nanosci & Nanoengn Rapid City SD 57701 USA;

    Univ Utah Dept Chem Engn Salt Lake City UT 84112 USA;

    Univ Wyoming Dept Petr & Chem Engn Laramie WY 82071 USA|Univ Wyoming Sch Energy Resources Laramie WY 82071 USA|Georgia Inst Technol Sch Civil & Environm Engn Atlanta GA 30332 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Coal; Coal tar; Carbon nanofiber; Ethanol; Supercritical CO2;

    机译：煤炭;焦油;碳纳米纤维;乙醇;超临界二氧化碳;

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