Elucidation of structural and hydroliquefaction characteristics of Yallourn brown coal by carbon-13 CP/MAS n.m.r. spectrometry

Yoshida, Tadashi; Nakata, Yoshinori; Yoshida, Ryoichi; Ueda, Shigeru; Kanda, Nobuyasu; Maekawa, Yosuke

doi:10.1016/0016-2361(82)90309-x

Cited by 70 publications

(15 citation statements)

References 14 publications

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“…Australian brown coals and their lithotypes have been extensively characterized Verheyen, 1982) before and after hydroliquefaction (Yoshida et al, 1982). Australian brown coals and their lithotypes have been extensively characterized Verheyen, 1982) before and after hydroliquefaction (Yoshida et al, 1982).…”

Section: B Aromatic Charactermentioning

confidence: 99%

An Essay on the Organic Geochemistry of Coal

Given¹

1984

Coal Science

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Section: B Aromatic Charactermentioning

confidence: 99%

An Essay on the Organic Geochemistry of Coal

Given¹

1984

Coal Science

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“…Chemical structures and aromaticity of the resultant pitches were determined by 13 C NMR and the spectra was shown in Figure . Different types of carbon atoms could be ascertained by their chemical shifts appeared in all samples, and they could be ascribed as: terminal ‐CH 3 in alkyl chain and ‐CH 3 to aromatic ring appeared at 0–25 ppm, CH 2 groups were at 25–51 ppm, methoxy group, C−O bonds in alcohols and ether group located at 51–93 ppm, aromatic carbon atoms bound to hydrogen (Ar−H) emerged at 129–148 ppm, aromatic carbon atoms bound to alkyl groups (Ar−C) ranged at 93–129 ppm and carbonyl carbon atoms were seated at 171–235 ppm …”

Section: Resultsmentioning

confidence: 99%

Chemical Modification of Asphaltene with SEBS as Precursor for Isotropic Pitch‐Based Carbon Fiber

Jiang

Shen

2019

ChemistrySelect

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A high yield spinnable pitch for isotropic pitch-based carbon fiber was successfully prepared by air oxidation polycondensation of asphaltene with styrene-ethylene-butylene-styrene. The effects of reaction temperature and time, added styreneethylene-butylene-styrene amount on the composition and spinning properties of resultant pitches were investigated. The resultant pitch with a concentrated molecular weight distribution of 300-700 Da was prepared at 340°C for 3 h under air blowing with 5% styrene-ethylene-butylene-styrene, moreover, its more alkyl structure (mainly methylene), lower apparent viscosity above the softening point, and good spinnability endowed the resultant pitches more prone to oxygen crosslinking during the stabilization process. The average tensile strength of resultant pitch-based carbon fibers was over 800 MPa after carbonization at 1000°C for 10 min. It provided a simple method to adjust the spinnable pitch for pitch-based carbon fiber preparation.

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“…Adding CT to NCO improved the carbonization yield, excellent qualities of NCO/CT based CF were attained from small amounts of oxygen content in the pitch and its homogeneous distribution improved linearity of the raw material (Kim et al 2014(Kim et al , 2016a. It is important though that they remain in the structure without bridging because they turn into volatile material during spinning since they decompose easily at relatively low temperatures making it difficult to maintain the shape of the fibre (Yoshida et al 1982;Okuyama et al 2004;Takanohashi et al 2008;Lee et al 2019).…”

Section: Chemical Structural Compositionmentioning

confidence: 99%

Influence of coal properties on coal conversion processes-coal carbonization, carbon fiber production, gasification and liquefaction technologies: a review

Keboletse

Ntuli

Oladijo

2021

Int J Coal Sci Technol

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Coal due to its relatively large quantities and wide distribution worldwide has generated renewed interest in research and development with the aim of establishing coal conversion technologies that are technically reliable, environmentally and economically feasible. It has proved to be a prominent energy source in emerging markets with increasing energy demand by accounting for the largest increase in the demand of energy amongst all other energy sources. Furthermore, with its higher mesophase content, coal tar is an appropriate raw material for precursors in the production of carbon fiber. However, whenever a material is put to use, it is important to be able to associate its properties to the behavioral characteristics during a conversion process so as to have a basis for opting for the material in a given process or adjusting the operating conditions in order to optimize the material utilization. Therefore, as with any other material, it is important to be able to relate the properties of coal to its utilization. A review was carried out on the influence of coal properties on four main utilization technologies: gasification, carbonization, liquefaction and carbon fibre production. Among several properties rank, type, mineral matter content, distribution of trace elements, structural composition and pore structure were found to be most influential on the behavior of coal during conversion processes.

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Elucidation of structural and hydroliquefaction characteristics of Yallourn brown coal by carbon-13 CP/MAS n.m.r. spectrometry

Cited by 70 publications

References 14 publications

An Essay on the Organic Geochemistry of Coal

An Essay on the Organic Geochemistry of Coal

Chemical Modification of Asphaltene with SEBS as Precursor for Isotropic Pitch‐Based Carbon Fiber

Influence of coal properties on coal conversion processes-coal carbonization, carbon fiber production, gasification and liquefaction technologies: a review

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