Structural features of liquefaction residue from Shenmu-Fugu subbituminous coal

Li, Peng; Zong, Zhi‐Min; Wei, Xian‐Yong; Wang, Qianqian; Fan, Guixia

doi:10.1016/j.fuel.2019.01.004

Cited by 24 publications

(5 citation statements)

References 47 publications

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“…The peak strength of THFS and TS is strong while that of HS is weak, indicating that THFS and TS contain more hydroxyl groups, which is consistent with the oxygen O content in Table . The bands at 3000–2800 cm –1 are assigned to aliphatic C–H stretching vibrations and can be used to determine the aliphatic hydrogen content. , The corresponding peaks for HS and TS are strong while that for THFS is weak, indicating that HS and TS contain more alkane structures. This is consistent with their higher C and H content in Table .…”

Section: Resultsmentioning

confidence: 99%

“…The bands at 3000–2800 cm –1 are assigned to aliphatic C–H stretching vibrations and can be used to determine the aliphatic hydrogen content. 22 , 23 The corresponding peaks for HS and TS are strong while that for THFS is weak, indicating that HS and TS contain more alkane structures. This is consistent with their higher C and H content in Table 2 .…”

Section: Resultsmentioning

confidence: 99%

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Construction of Macromolecules of Depolymerized Lignite

et al. 2023

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Preparing ash-less coal and further converting it into chemicals is an efficient and promising means for lignite utilization. This work performed depolymerization of lignite to prepare ash-less coal (SDP) and separated it into the hexane-soluble fraction (HS), toluene-soluble fraction (TS), and tetrahydrofuran-soluble fraction (THFS). The structure of SDP and those of subfractions were characterized by elemental analysis, gel permeation chromatography, Fourier transform infrared spectroscopy, and synchronous fluorescence spectroscopy. The results show that SDP is a mixture of aromatic derivatives containing alkyl substituents and oxygen-containing functional groups. The number of condensed aromatic rings, the amount of oxygen-containing functional groups, and the molecular weight gradually increase as HS < TS < THFS. SDP was further analyzed by 1H-NMR and 13C-NMR to calculate its structural parameters. The macromolecule of THFS contains 15.8 total ring systems with 9.2 aromatic rings and 6.6 naphthenic rings. On average, each THFS molecule contains 6.1 alcohol hydroxyl groups, 3.9 phenol hydroxyl groups, 1.4 carboxyl groups, and 1.0 inactive oxygen-containing functional groups. The dominant reactions occurred during depolymerization are the breakage of ether linkages. The average THFS molecule consists of 3.3 structural units with aromatic nuclei (2.8 rings on average) linked with methylene, naphthene, and so forth.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Construction of Macromolecules of Depolymerized Lignite

et al. 2023

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“…The extract from DCLR was successfully applied in the preparation of carbon fibers by arc-jet plasma [15] and the melt-spinning approach [16], as it has a good solubility in organic solvents [17]. Moreover, owing to the good solubility of organic carbons in tetrahydrofuran and polyacrylonitrile in dimethylformamide, a DCLR-based carbon nanofiber film was also prepared as electrodes for supercapacitors [18] and in lithium-/potassium-ion batteries by electrospinning [19].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Electrochemical Performance of Activated Composite Carbon Nanofibers Using Extraction Residue from Direct Coal Liquefaction Residue

Liu,

Wu,

Qiao

et al. 2024

Sustainability

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Organic carbon extracted from direct coal liquefaction residue (DLCR) is an ideal precursor for the preparation of carbon materials. However, investigations into the utilization of the extraction residue (ER) are rarely reported. In this work, ER from DCLR was pretreated with H2O2 to afford oxidized extraction residue (OER). Then, the OER was mixed with polyacrylonitrile (PAN) in N,N-dimethylformamide for the preparation of composite carbon nanofibers by electrospinning. With adding 80 wt.% OER, the composite carbon nanofibers still demonstrate a clear fiber profile and smooth surface under a scanning electron microscope, indicating that the OER has good solubility with PAN in N,N-dimethylformamide. The electrochemical performance characterization of the activated composite carbon nanofiber shows that the P-OER60-AC (activated composite carbon nanofibers prepared with 60 wt.% of OER and 40 wt.% of PAN) has a better electrochemical performance with a specific capacitance of 97 F/g at 0.5 A/g, as compared to the others. Additionally, the P-OER80-AC (activated composite carbon nanofibers prepared with 80 wt.% of OER and 20 wt.% of PAN) is also considerable for the perspective of coal-based solid waste treatment and utilization.

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“…of the total residue. Inorganic minerals include minerals from the coal liquefaction itself and newly formed and residual metal catalysts during the liquefaction process [10]. The molybdenum catalyst and molybdenum iron composite catalyst [11,12] have been developed based on the nano-FeOOH catalyst in industrial application [13].…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Reaction Mechanism of Molybdenum Metal in Direct Coal Liquefaction Residue

Zhu

et al. 2022

Catalysts

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In this paper, the extraction residue of direct coal liquefaction residue-DCLR(ER) was used as raw material. The high-temperature reaction mechanism of Mo compound in DCLR(ER) was investigated using a synchronous thermal analyzer and the Factsage database. The high temperature reaction of DCLR(ER)-MoO3 in an oxygen atmosphere consists of pyrolysis of organic components at 400–600 °C, molybdenum trioxide sublimation at 747–1200 °C, and a stable stage at 600–747 °C. The thermal reaction process of the DCLR(ER)-MoS2 system in the oxygen atmosphere involves the pyrolysis of unreacted coal and asphaltene, the oxidation of molybdenum sulfide at 349–606/666 °C, the diffusion of MoO3 at 606/666–85 °C, and the sublimation reaction process of MoO3 at 854–1200 °C. The results show that the lower heating rate can promote the oxidation of the Mo compound and the sublimation of molybdenum trioxide. On the other hand, the oxides of aluminum, calcium, and iron in DCLR(ER) can inhibit the oxidative pyrolysis efficiency of the DCLR(ER)-MoS2 system.

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Structural features of liquefaction residue from Shenmu-Fugu subbituminous coal

Cited by 24 publications

References 47 publications

Construction of Macromolecules of Depolymerized Lignite

Construction of Macromolecules of Depolymerized Lignite

Preparation and Electrochemical Performance of Activated Composite Carbon Nanofibers Using Extraction Residue from Direct Coal Liquefaction Residue

High-Temperature Reaction Mechanism of Molybdenum Metal in Direct Coal Liquefaction Residue

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