Occurrence of non-mineral inorganic elements in macerals of low-rank coals

Li, Zhongsheng; Ward, Colin R.; Gurba, Lila W.

doi:10.1016/j.coal.2009.02.004

Cited by 88 publications

(38 citation statements)

References 34 publications

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“…The vitrinite in samples 5 and 6 appears to have relatively high proportions of Al and only traces of Si, suggesting either the incorporation of bauxite-group minerals (gibbsite and/or boehmite), or possibly incorporation of Al as an inorganic element within the vitrinite component. The occurrence of Al in vitrinite, without significant Si, was also noted in microprobe studies by Ward et al (2007) and Li et al (2010).…”

Section: Determination Of Mineral Matter and Elemental Composition Ofmentioning

confidence: 87%

Determination of mineral matter and elemental composition of individual macerals in coals from Highveld mines

Matjie¹,

Li²,

Ward³

et al. 2016

J. S. Afr. Inst. Min. Metall.

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Section: Determination Of Mineral Matter and Elemental Composition Ofmentioning

confidence: 87%

Determination of mineral matter and elemental composition of individual macerals in coals from Highveld mines

Matjie¹,

Li²,

Ward³

et al. 2016

J. S. Afr. Inst. Min. Metall.

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“…(a) (b) although the experimental test ruled out the effect of clay minerals and other inorganic substances, the microelements existing in the form of non-minerals lead to the experimental test density being greater than the calculated density [59]. On the other hand, a great number of small molecules of substances exist in the actual kerogen structure, and it will fill in the kerogen pores.…”

Section: Resultsmentioning

confidence: 99%

Study on the Adsorption, Diffusion and Permeation Selectivity of Shale Gas in Organics

Wang

Liu

et al. 2017

Energies

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Abstract:As kerogen is the main organic component in shale, the adsorption capacity, diffusion and permeability of the gas in kerogen plays an important role in shale gas production. Based on the molecular model of type II kerogen, an organic nanoporous structure was established. The Grand Canonical Monte Carlo (GCMC) and Molecular Dynamics (MD) methods were used to study the adsorption and diffusion capacity of mixed gas systems with different mole ratios of CO 2 and CH 4 in the foregoing nanoporous structure, and gas adsorption, isosteric heats of adsorption and self-diffusion coefficient were obtained. The selective permeation of gas components in the organic pores was further studied. The results show that CO 2 and CH 4 present physical adsorption in the organic nanopores. The adsorption capacity of CO 2 is larger than that of CH 4 in organic pores, but the self-diffusion coefficient of CH 4 in mixed gas is larger than that of CO 2 . Moreover, the self-diffusion coefficient in the horizontal direction is larger than that in the vertical direction. The mixed gas pressure and mole ratio have limited effects on the isosteric heat and the self-diffusion of CH 4 and CO 2 adsorption. Regarding the analysis of mixed gas selective permeation, it is concluded that the adsorption selectivity of CO 2 is larger than that of CH 4 in the organic nanopores. The larger the CO 2 /CH 4 mole ratio, the greater the adsorption and permeation selectivity of mixed gas in shale. The permeation process is mainly controlled by adsorption rather than diffusion. These results are expected to reveal the adsorption and diffusion mechanism of gas in shale organics, which has a great significance for further research.

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“…Significant concentrations of such elements have been identified in the organic matter of other lower rank coals, especially the vitrinite, by electron microprobe studies (Li et al, 2007(Li et al, , 2010.…”

Section: Relation Of Lta Mineralogy To Ash Yieldmentioning

confidence: 98%

Petrological, geochemical, and mineralogical compositions of the low-Ge coals from the Shengli Coalfield, China: A comparative study with Ge-rich coals and a formation model for coal-hosted Ge ore deposit

Dai

Liu

Ward

et al. 2015

Ore Geology Reviews

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131

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Occurrence of non-mineral inorganic elements in macerals of low-rank coals

Cited by 88 publications

References 34 publications

Determination of mineral matter and elemental composition of individual macerals in coals from Highveld mines

Determination of mineral matter and elemental composition of individual macerals in coals from Highveld mines

Study on the Adsorption, Diffusion and Permeation Selectivity of Shale Gas in Organics

Petrological, geochemical, and mineralogical compositions of the low-Ge coals from the Shengli Coalfield, China: A comparative study with Ge-rich coals and a formation model for coal-hosted Ge ore deposit

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