Observation of carbon nanostructure and evolution of chemical structure from coal to graphite by high temperature treatment, using componential determination, X-ray diffraction and high-resolution transmission electron microscope

Zhang, Xiaomei; Wang, Shaoqing; Chen, Hao; Wang, Xiaoxing; Deng, J. S.; Li, Xueqi; Zhang, Yixiu

doi:10.1016/j.fuel.2022.126145

Cited by 25 publications

(3 citation statements)

References 47 publications

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“…It is thought that a temperature of 1500 • C is required for the carbonization of high-rank coal [5,53]. Most S has been driven off at 1000 • C, and the remnant S element remains inert until 1950 • C [54]. The pure carbon will not be obtained until 2000 • C [5].…”

Section: Discussionmentioning

confidence: 99%

“…The importance evaluation relating to the effect of mineral content and type among kaolinite, calcite, quartz, and pyrite on the yield, degree of graphitization, stacking height, lateral size, and defect degrees of aromatic rings on the corresponding samples, after the synthetic graphitization derived from the mixture samples, is roughly measured based on the relationships between these changes and the mineral content/type (Table 7). above 0.3440 nm [54]. However, the total content of heteroatom atoms is low to less than 5% due to the high rank of the used BJG and JGS anthracite.…”

Section: The Lateral Size (L a )mentioning

confidence: 99%

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Effects of Minerals Type and Content on the Synthetic Graphitization of Coal: Insights from the Mixture of Minerals and Anthracite with Varied Rank

Luo,

Tang,

et al. 2023

Minerals

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The challenge of how to effectively treat minerals in coal before synthetic graphitization is a practical problem. It is unrealistic to remove minerals completely via physical or chemical methods. So, it is essential to clarify the role of minerals in the synthetic graphitization of coal. Based on the complex mineral composition, the mixture samples consisting of coal and mineral are used to obtain the effect of minerals type and content on the synthetic graphitization of coal. The role of minerals in synthetic graphitization is closely associated with the mineral content and type, as well as the rank. As to the lower-rank anthracite, quartz, kaolinite, and calcite have the role of inhibitor for the yields and defect degrees of corresponding samples after synthetic graphitization derived from the mixtures, but the role of catalyzer for their crystal structure (the degree of graphitization, stacking height, lateral size). The increasing content of quartz, kaolinite, and calcite is harmful for the yield, but useful for the crystal structure and defect degrees; the increasing content of pyrite is harmful for the yield, degree of graphitization, and stacking height, and it is useful for defect degrees. As to the higher-rank anthracite, quartz, kaolinite, and calcite have the role of inhibitor for the yield of corresponding samples after synthetic graphitization, catalyzer for their crystal sizes (stacking height, lateral size), and inertia for their degrees of graphitization. The increasing content of quartz, kaolinite, calcite, and pyrite is harmful for the yield and crystal size. A lower coal rank indicates being more prone to positive mineral effects on synthetic graphitization. The role of minerals in the synthetic graphitization of coal is complex and also represents a coupling relationship with the thermal transformation of anthracite.

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Section: Discussionmentioning

confidence: 99%

Section: The Lateral Size (L a )mentioning

confidence: 99%

Effects of Minerals Type and Content on the Synthetic Graphitization of Coal: Insights from the Mixture of Minerals and Anthracite with Varied Rank

Luo,

Tang,

et al. 2023

Minerals

View full text Add to dashboard Cite

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“…How to improve the value of conventional coal is still a challenging problem. Many works focus on the coal chemical industry [ 13 ], graphitization of coal [ 14 , 15 ], and nanostructure transformation of coal [ 16 , 17 ]. Nevertheless, these processes always show a low utilization conversion rate, high energy consumption, and relatively high pollution.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Microwave Absorption Properties of Core-Shell Structure Nanocomposite Based on Modified Anthracite Coal

Zhang

Zhou

et al. 2023

Nanomaterials

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Microwave-absorbing materials have attracted extensive attention due to the development of electronic countermeasures. In this study, novel nanocomposites with core–shell structures based on the core of Fe-Co nanocrystals and the shell of furan methylamine (FMA)-modified anthracite coal (Coal-F) were designed and fabricated. The Diels-Alder (D-A) reaction of Coal-F with FMA creates a large amount of aromatic lamellar structure. After the high-temperature treatment, the modified anthracite with a high degree of graphitization showed an excellent dielectric loss, and the addition of Fe and Co effectively enhanced the magnetic loss of the obtained nanocomposites. In addition, the obtained micro-morphologies proved the core–shell structure, which plays a significant role in strengthening the interface polarization. As a result, the combined effect of the multiple loss mechanism promoted a remarkable improvement in the absorption of incident electromagnetic waves. The carbonization temperatures were specifically studied through a setting control experiment, and 1200 °C was proved to be the optimum parameter to obtain the best dielectric loss and magnetic loss of the sample. The detecting results show that the 10 wt.% CFC-1200/paraffin wax sample with a thickness of 5 mm achieves a minimum reflection loss of −41.6 dB at a frequency of 6.25 GHz, indicating an excellent microwave absorption performance.

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Coke behavior with H2O in a hydrogen-enriched blast furnace: A review

Zhou,

Peng,

et al. 2024

Int J Miner Metall Mater

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Observation of carbon nanostructure and evolution of chemical structure from coal to graphite by high temperature treatment, using componential determination, X-ray diffraction and high-resolution transmission electron microscope

Cited by 25 publications

References 47 publications

Effects of Minerals Type and Content on the Synthetic Graphitization of Coal: Insights from the Mixture of Minerals and Anthracite with Varied Rank

Effects of Minerals Type and Content on the Synthetic Graphitization of Coal: Insights from the Mixture of Minerals and Anthracite with Varied Rank

Fabrication and Microwave Absorption Properties of Core-Shell Structure Nanocomposite Based on Modified Anthracite Coal

Coke behavior with H2O in a hydrogen-enriched blast furnace: A review

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