Structural evolution characteristics of lignite during pyrolysis based on alkaline-oxygen oxidation, NMR and FTIR

Li, He; Hou, Yucui; He, Zhuosen; Jiang, Wei; Ren, Shuhang; Wu, Weize

doi:10.1016/j.jaap.2023.105980

Journal of Analytical and Applied Pyrolysis

2023

DOI: 10.1016/j.jaap.2023.105980

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Structural evolution characteristics of lignite during pyrolysis based on alkaline-oxygen oxidation, NMR and FTIR

He Li

Yucui Hou

Zhuosen He

et al.

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2024

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Cited by 7 publications

References 45 publications

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Enhancing the electrochemical performance of semicoke‐based hard carbon anode through oxidation‐crosslinking strategy for low‐cost sodium‐ion batteries

Ma,

Tang,

Tang

et al. 2024

Carbon Energy

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Semicoke, a coal pyrolysis product, is a cost‐effective and high‐yield precursor for hard carbon used as anode in sodium‐ion batteries (SIBs). However, as a thermoplastic precursor, semicoke inevitably graphitizes during high‐temperature carbonization, so it is not easy to form the hard carbon structure. Herein, we propose an oxidation‐crosslinking strategy to realize fusion‐to‐solid‐state pyrolysis of semicoke. The semicoke is first preoxidized using a modified alkali‐oxygen oxidation method to enrich its surface with carboxyl groups, which are localization points and the cross‐linking reactions occur with citric acid to build the semicoke precursor with homogeneous and abundant ‐C‐(O)–O‐ groups (up to 21 at% oxygen content). The ‐C‐(O)–O‐ groups effectively prevent the rearrangement of carbon microcrystals in semicoke during carbonization, resulting in the formation of an abundant pseudographite structure with larger carbon interlayer spacing and micropores. The optimized semicoke‐based hard carbon shows both a high initial Coulombic efficiency of 81% and a specific capacity of 307 mAh g−1, with low‐voltage plateau capacity increased to 2.5 times, compared to that of the unmodified semicoke carbon. By the combination of detailed discharge curves and in situ X‐ray diffraction analysis, the plateau capacity of semicoke‐based hard carbon is mainly derived from interlayer intercalation of Na+ ion. The proposed oxidation‐crosslinking strategy can contribute to the usage of low‐cost and high‐performance hard carbons in advanced SIBs.

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Enhancing the electrochemical performance of semicoke‐based hard carbon anode through oxidation‐crosslinking strategy for low‐cost sodium‐ion batteries

Ma,

Tang,

Tang

et al. 2024

Carbon Energy

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Effect of deep eutectic solvent on combustion characteristics of lignite under thermal treatment conditions

Wu,

Liu,

et al. 2024

Can J Chem Eng

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The substantial moisture content of lignite imposes considerable constraints on its deep processing and subsequent utilization. A deep eutectic solvent (DES), synthesized from choline chloride (ChCl) and zinc chloride (ZnCl₂), was used to upgrade lignite under thermal treatment conditions. The effects of the DES molar ratio and its addition on the physicochemical and combustion characteristics of lignite were systematically analyzed at 280°C. The results demonstrated that the moisture content of lignite decreased from 22.63% to 5.18%, and then to 6.05%, as the molar ratio of DES was adjusted from 1:1 to 1:3, with the addition of 3 g of DES. This suggests that a DES molar ratio of 1:1 is more effective for lignite upgrading. As the DES addition increased from 1 g to 3 g, the moisture content of lignite decreased from 9.19% to 5.18%. As the molar ratio of ZnCl₂ in DES increased, the maximum combustion rate (Vmax) and ignition index (C) of the upgraded coal sample gradually decreased, indicating that lignite upgraded with DES at a 1:1 molar ratio exhibited good combustion performance. The sample treated with 3 g of DES demonstrated the best overall combustion characteristic index (S = 1.8), optimal ignition index (C), and combustion index (Rj), when the DES addition increased from 1 g to 3 g. Compared to raw coal, the activation energy of the upgraded lignite was lower (Eₐ = 63.99 kJ/mol), indicating enhanced combustion reactivity.

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A combined experimental and theoretical study on the mechanism of catalytic oxidation of lignite to carboxylic acids by iron

Bai,

Xu,

Wang

et al. 2024

Fuel

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Structural evolution characteristics of lignite during pyrolysis based on alkaline-oxygen oxidation, NMR and FTIR

Cited by 7 publications

References 45 publications

Enhancing the electrochemical performance of semicoke‐based hard carbon anode through oxidation‐crosslinking strategy for low‐cost sodium‐ion batteries

Enhancing the electrochemical performance of semicoke‐based hard carbon anode through oxidation‐crosslinking strategy for low‐cost sodium‐ion batteries

Effect of deep eutectic solvent on combustion characteristics of lignite under thermal treatment conditions

A combined experimental and theoretical study on the mechanism of catalytic oxidation of lignite to carboxylic acids by iron

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