XRD analysis of carbon stacking structure in coal during heat treatment

Takagi, Hidenari; Maruyama, Katsuhisa; Yoshizawa, Noriko; Yamada, Yoshio; Satô, Yoshiki

doi:10.1016/j.fuel.2004.06.019

Cited by 370 publications

(186 citation statements)

References 17 publications

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“…d002 values of carbon foams obtained for 22-25 ° varied in the range of 0.3545-0.3936 nm (Table 3). These values are greater than the value of graphite (0.3350 nm), which refers to nongraphitized carbon structure of synthesized foams [1,21,22]. d002 values decreased with rising the temperature from 400 °C to 800 °C.…”

Section: X-ray Diffraction Analysismentioning

confidence: 88%

Liquefaction of oak tree bark with different biomass/phenol mass ratios and utilizing bio-based polyols for carbon foam production

Özbay¹,

Yargıç²

2017

AIP Conference Proceedings

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Section: X-ray Diffraction Analysismentioning

confidence: 88%

Liquefaction of oak tree bark with different biomass/phenol mass ratios and utilizing bio-based polyols for carbon foam production

Özbay¹,

Yargıç²

2017

AIP Conference Proceedings

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“…From Fig. 2, the peaks at 2h = 20°-30°referred to the stacking structure of aromatic layers (graphite 002), and the broadening originated from the small dimensions of crystallites perpendicular to aromatic layers (Takagi et al 2004). Sharp and non-labeled peaks in PC indicated miscellaneous inorganic components.…”

Section: Xrd Analysismentioning

confidence: 94%

Adsorption of anionic dye on magnesium hydroxide-coated pyrolytic bio-char and reuse by microwave irradiation

Zhang

Mao

Jiao

et al. 2013

Int. J. Environ. Sci. Technol.

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Magnesium hydroxide-coated pyrolytic biochar composite was prepared by chemical precipitation, and the adsorption behavior of anionic dye (directly frozen yellow) onto magnesium hydroxide-coated pyrolytic biochar was investigated in the batch mode. The Fourier transform infrared spectroscopy, X-ray diffraction spectroscopy and X-ray fluorescence spectroscopy of adsorbents were characterized. Adsorption studies were performed at different pH, salt concentration, contacting time and dye concentration. The pH value of the solution influenced the adsorption capacity significantly, and adsorption is favored of pH 6-8. Salt coexisted in solution increased slightly directly frozen yellow adsorption capacity. The isotherm data were analyzed by Langmuir and Freundlich isotherm model, and Langmuir model was better to predict the equilibrium data. Thermodynamic calculations showed that the adsorption was a spontaneous and endothermic process. Exhausted magnesium hydroxide-coated pyrolytic bio-char was treated by microwave irradiation, and yield of regeneration was 98 % in the case of microwave irradiated time 5 min at 320 W. The magnesium hydroxide-coated pyrolytic bio-char can be reused.

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“…After treatment with HNO 3 , the peak for the (002) plane of sample 2 and 3 slightly shifted to higher degree compared with raw coal sample (sample 1), and gradually approached the (002) plane of graphite at 26.6°, but the peak width and height showed a significant difference, i.e., the peak of sample 2 which was only treated at 25°C became wider and shorter while the peak of sample 3 which was treated with HNO 3 under reflux became narrower and higher. The results reveal that HNO 3 treatment under reflux condition can not only lower the ash content in the coal structure but also reduce the content of aliphatic structure, thereby increasing the relative content of polycyclic aromatic rings (Taylor and Bell 1980;Takagi et al 2004). The XRD results are consistent with the FT-IR results, which may be attributed to the partial breakdown of the aliphatic chains linking the aromatic units by HNO 3 under reflux condition.…”

Section: Properties Of Depolymerized Coal Samplesmentioning

confidence: 99%

Effect of pH conditions on the depolymerization of Wucaiwan coal by mixed acids/ultrasound method and the product structures and performance

Zhang

Maimaiti

Zhang

et al. 2017

Int J Coal Sci Technol

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The cleavage of the aliphatic chain or ether bond connecting the polycyclic aromatic hydrocarbons in coal can be achieved by not only hydrogenation reduction but also oxidative acid treatment. In this paper, coal samples from Wucaiwan in Xinjiang were pretreated with HNO 3 followed by mixed acids/ultrasound treatment. The depolymerized coal samples obtained under different pH conditions were then separated by fractional washing. The structures and properties of the resulting coal samples were studied by elemental analysis, FT-IR, XRD, TG-DTA, TEM, UV-Vis, and PL. The results showed that when pH = 0.012, the obtained coal samples were fragments stripped off from the raw coal samples by ultrasound in strong acid conditions, aliphatic hydrocarbons linked with oxygen-containing groups such as nitro group, a small amount of small aromatic molecules and mineral salts; when pH = 1.99-4.09, the obtained coal samples were polycyclic aromatic hydrocarbons linked with oxygen-containing groups such as nitro group,possessing the annulus wall of multilayer graphene fragment structures built up by sp 2 carbons, and they are typical fluorescent substances of carbon nanoparticle structure. The former has no solubility in organic solvents, while the latter can be well dissolved in polar solvents such as acetone. All the depolymerized coal samples obtained under different pH conditions exhibited good absorption and ability of fluorescence emission.

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XRD analysis of carbon stacking structure in coal during heat treatment

Cited by 370 publications

References 17 publications

Liquefaction of oak tree bark with different biomass/phenol mass ratios and utilizing bio-based polyols for carbon foam production

Liquefaction of oak tree bark with different biomass/phenol mass ratios and utilizing bio-based polyols for carbon foam production

Adsorption of anionic dye on magnesium hydroxide-coated pyrolytic bio-char and reuse by microwave irradiation

Effect of pH conditions on the depolymerization of Wucaiwan coal by mixed acids/ultrasound method and the product structures and performance

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