A low carbon footprint method for converting low-rank coals to oxygen-containing chemicals

Wang, Zhicai; Wu, Tao; Wu, Zequan; Li, Zhan-Ku; Yan, Jingchong; Yan, Hong-Lei; Pan, Chunxiu; Kang, Shigang; Lei, Zhiping; Ren, Shibiao; Shui, Hengfu

doi:10.1016/j.fuel.2022.123277

Cited by 25 publications

(6 citation statements)

References 35 publications

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“…Additionally, two characteristic absorption peaks corresponding to the stretching vibration of C–O in the 1000–1260 cm –1 range and −OH around 3420 cm –1 in a-AER 500 indicated that a-AER 500 retained abundant OCFGs after activation. The absorbance of aromatic CC vibration around 1600 cm –1 in a-AER 500 was stronger than that in AER 500 , while the absorbance of −CH 2 – and −CH 3 vibration around 2900 cm –1 and 2870 cm –1 in a-AER 500 was weaker than those in AER 500, suggesting that the macromolecular aromatic structures were further polymerized at high temperature.…”

Section: Resultsmentioning

confidence: 93%

Efficient Two-Step Utilization of Organic Matter in Shengli Lignite for Producing Chemicals and Supercapacitor Electrode Materials

et al. 2023

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Conversion of organic matter in lignite into chemicals and high-performance carbon materials is a promising approach for clean and efficient utilization of lignite. Herein, Shengli lignite (SL) is subjected to supercritical ethanolysis, followed by ultrasonic extraction with isometric carbon disulfide/ acetone for separating SL into soluble organic matters (SOMs) and insoluble extraction residue (ER) with highly condensed aromatic structures. According to the analyses with gas chromatography/ mass spectrometry (GC/MS) and Orbitrap MS, the SOMs were mainly composed of oxygen-containing compounds, such as arenols, aliphatic esters, and aromatic esters, which can be used as feedstock for producing value-added chemicals. The ER was used as a carbon precursor to produce three-dimensional porous carbon materials (PCMs) through precarbonization and activation with KOH using nano-ZnO as an in situ template. The prepared PCMs possessed high stability, large specific surface area, and abundant oxygen-doped carbon, showing a high specific capacitance of 300 F g −1 at 0.5 A g −1 in a three-electrode system, and the capacitance retention was 100% after 10,000 cycles of charge and discharge at 5 A g −1 in a two-electrode system.

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Section: Resultsmentioning

confidence: 93%

Efficient Two-Step Utilization of Organic Matter in Shengli Lignite for Producing Chemicals and Supercapacitor Electrode Materials

et al. 2023

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“…This is consistent with their higher C and H content in Table . All the SDP subfractions show the obvious carbonyl vibration peaks at 1710 cm –1 . , The peaks near 1610, 1500, and 1450 cm –1 are assigned to aromatic ring stretching vibrations. , The peaks of THFS and TS at these positions are strong while that of HS is weak, indicating abundant aromatic structures in THFS and TS. The bands at 1300–1000 cm –1 are assigned to C–O (alcohol), C–O (phenol), and C–O–C structures, and their presence suggests the rich alcohol, phenol, and/or ether group in SDP subfractions.…”

Section: Resultsmentioning

confidence: 97%

“…The strong resonance peaks at 126–128.5 ppm indicate the preponderance of phenanthrene, its methyl-substituted molecule, and anthracene. The peaks at 137–139 ppm are attributed to polycyclic species and their substituted aromatics. , The total number of carbons ( C t ) in THFS is 78.5; therefore, the number of each type of carbon of THFS can be calculated from the 13 C-NMR spectra, and the results are listed in Table . The number of carbons in the carboxyl group of an average molecule of THFS is 1.4 (Table ).…”

Section: Resultsmentioning

confidence: 99%

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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“…53 CBHA mainly consists of sp 2 -conjugated CQC rings connected with carboxyl (-COOH), hydroxyl (-OH), and carbonyl (CQO), which is the perfect precursor for the assembly of CDs. 53,54 The synthetic CBHA-derived CDs (HACDs) have abundant functional groups and excellent properties, which can be applied in areas such as bio-imaging, chemical analysis, photocatalysis and optoelectronic materials. 55 However, to the best of our knowledge, there are few reports on coal-based CDs as RTP materials.…”

Section: Introductionmentioning

confidence: 99%