Mechanism of hydrogenation of coal-derived asphaltene

Kanda, Nobuyasu; Itoh, Hironori; Yokoyama, Susum; Ōuchi, Koji

doi:10.1016/0016-2361(78)90020-0

Cited by 58 publications

(9 citation statements)

References 5 publications

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“…Kanda et al 27 modified the Brown~Ladner equations, in which the number of aromatic peripheral hydrogen atoms is corrected for heterocyclic 0, N, S atoms, and oxygen atoms were separated into phenoxy 1 and heterocyclic oxygens. Iwata et al 3 obtained the quinoline extracts from various ranks of coals at 350~ 380 CC.…”

Section: Structural Parameter and Modelmentioning

confidence: 99%

Molecular and Colloidal Structure of Coal Asphaltenes and Other Heavy Solvent Soluble Components

Iino

Takanohashi

1998

Structures and Dynamics of Asphaltenes

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Section: Structural Parameter and Modelmentioning

confidence: 99%

Molecular and Colloidal Structure of Coal Asphaltenes and Other Heavy Solvent Soluble Components

Iino

Takanohashi

1998

Structures and Dynamics of Asphaltenes

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“…Similarly, the FL spectrometry is also limited in the determinations of PA and AS because there are very complex phosphors and energy transfers [3]. In addition, 1 H NMR and 13 C NMR can be used to determine the contents of aromatic hydrogen and carbon but they can not give the distribution of aromatic ring number. For example, Seshadri et al suggested by the characterizations of 13 C NMR and FTIR that AS and PA separated from the products of DCL are 'oligomeric' in structure, in which aromatic clusters being linked by carbon bridges and containing different functional groups [6].…”

Section: Introductionmentioning

confidence: 99%

“…Kanda et al [1] suggested that one molecule of original AS consists of 1-3 structural unit on average, in which there are 2 or 3 aromatic rings with 1 or 2 naphthenic rings, 0 or 1 alkyl carbon atom, 0 or 1 OH group and 0 or 1 hetero-ring. In general, the aromatic structural features of PA and AS such as the size of aromatic ring and the degree of condensation are important for their upgrading and stability.…”

Section: Introductionmentioning

confidence: 99%

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Synchronous fluorimetric characterization of heavy intermediates of coal direct liquefaction

Wang

Wei

Shui

et al. 2012

Fuel

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“…In the 1950s and 1960s, coal chemistry entered into the golden age of rapid development and several coal structure models have been developed. Some of the representative models are the Krevelen model, 5 the Given model, 6 the Wiser model, 7 the Shine Model, 8 and the Faulon model. 2 Various physical and chemical methods have been used in the detailed analysis of coal structure.…”

Section: Introductionmentioning

confidence: 99%

A Model of Lignite Macromolecular Structures and Its Effect on the Wettability of Coal: A Case Study

et al. 2017

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Chemical and physical structure properties of coal macromolecules are the main microscopic factors affecting coal wettability. Numerous studies on coal structures have found that lignite, as a coal of low metamorphic degree, shows more-complicated macromolecular structures than other types of coal, and the macromolecular structure of lignite can better promote coal wettability than other low metamorphic coals with similar physical pore structures. To investigate the underlying reasons, lignite samples from the main coal producing areas of China were analyzed via X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy, and physical methods were used to construct two-dimensional and three-dimensional models of lignite macroscopic molecular structures to study its effect on coal wettability. The results indicated that aromatic layer spacing of lignite was considerably large and showed a low degree of aromatization with irregular arrangement and less directional degree. The macroscopic molecular structure of lignite was composed of 3–4 effectively stacked aromatic layers and alicyclic layers of hexagonal or pentagonal structures. The alicyclic ring structure was well-developed in the atom radial direction and had a high content of active ingredient, which was prone to attractive interaction with other molecules. The molecular formula of the lignite sample was determined to be C180H145O31N5S and the adsorption and spreading of wetting agents were found to be mainly dependent on the hydrophilic ability of coal surface. Furthermore, the microscopic pore stacking stereochemical structure of lignite indicated the existence of hydrophilic groups in surface functional groups around molecular nucleus, which resulted in the formation of infiltration points in the coal crystallite nucleus structure. Meanwhile, the absence of delocalized electron in the atom radial direction of amorphous lignite atoms could induce a relatively poor ability of attracting negative charge, and thus lessening the repulsive interaction to the electronegative ions in aqueous solutions, which promoted the wetting effect to some extent.

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Mechanism of hydrogenation of coal-derived asphaltene

Cited by 58 publications

References 5 publications

Molecular and Colloidal Structure of Coal Asphaltenes and Other Heavy Solvent Soluble Components

Molecular and Colloidal Structure of Coal Asphaltenes and Other Heavy Solvent Soluble Components

Synchronous fluorimetric characterization of heavy intermediates of coal direct liquefaction

A Model of Lignite Macromolecular Structures and Its Effect on the Wettability of Coal: A Case Study

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