2010
DOI: 10.1016/j.fuel.2009.07.020
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Molecular representations of Permian-aged vitrinite-rich and inertinite-rich South African coals

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Cited by 195 publications
(158 citation statements)
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“…Prior to deconvolution, the 13 C-NMR spectrum was adjusted using the Nuts Software. Then, the PFM module of the Origin Software was used to subtract the baseline, add peaks manually according to the spectrum shape and assignment of NMR structure The chemical shifts and assignment for the 13 C-NMR spectra of coal and its precursor have been summarized in previous studies [57][58][59][60][79][80][81][82][83][84][85], and the reported chemical shifts are mostly identical with only minor differences. The 13 C-NMR structure parameters and assignment used in the present study are given in Table 2 [84,[86][87][88].…”
Section: Samples and Analytical Methodsmentioning
confidence: 99%
See 1 more Smart Citation
“…Prior to deconvolution, the 13 C-NMR spectrum was adjusted using the Nuts Software. Then, the PFM module of the Origin Software was used to subtract the baseline, add peaks manually according to the spectrum shape and assignment of NMR structure The chemical shifts and assignment for the 13 C-NMR spectra of coal and its precursor have been summarized in previous studies [57][58][59][60][79][80][81][82][83][84][85], and the reported chemical shifts are mostly identical with only minor differences. The 13 C-NMR structure parameters and assignment used in the present study are given in Table 2 [84,[86][87][88].…”
Section: Samples and Analytical Methodsmentioning
confidence: 99%
“…Moreover, the chemical structures of coal lithotypes and macerals were also investigated by 13 C-NMR [55,56]. This technique has developed into an indispensable analytical method for coal macromolecular characterization [57][58][59][60].…”
Section: Introductionmentioning
confidence: 99%
“…The char models used for modelling studies were based on the HRTEM results shown in Figure 1; the method of parallelogram catenations by Mathews et al was used to calculate size distribution of aromatic carbon sheets [53,54]. This technique involves intensive image processing of the photo-micrographs (Figure 1(a)) to extract skeletonised lattice fringes (Figure 1(b)) following an approach of Sharma et al [55].…”
Section: Char Molecular Modelsmentioning
confidence: 99%
“…With more advanced analytical techniques, such as high resolution transmission electron microscope (HRTEM), Fourier-transform infrared spectroscopy (FTIR), solid-state 13 C nuclear magnetic resonance spectroscopy (NMR), X-ray analysis and pyrolysis gas chromatography mass spectrometry (GCMS), a more detailed picture of coal structure has been obtained [1][2][3][4][5][6]. Larger-scale atomistic representations that incorporate elemental data and structural information from the analytical techniques are emerging and are supported by advanced computer programs that facilitate construction and evaluation [3,[7][8][9]. The majority of coals that have experienced this level of research are from the carboniferous deposits of the Laurasian-age in the Northern Hemisphere.…”
Section: Introductionmentioning
confidence: 99%
“…A review of the hand-drawn and computational representations of coal is available [15]. The structural representations of coals of Permian-age in the Southern Hemisphere are limited to only two models of an inertinite-and vitrinite-rich coal from South Africa [7]. Much of the coal in the Southern Hemisphere was deposited during the Permian age on the continent of Gondwana [16,17].…”
Section: Introductionmentioning
confidence: 99%