Comparative study on structural parameters of graphitized coal-petroleum co-cokes and pennsylvania anthracites, with implications for their use

Mhlwazi S. Nyathi, Caroline Elaine Clifford, Harold H. Schobert

Research output: Contribution to journalArticle

Abstract

Nuclear-grade graphite samples, anisotropic commercial graphite, graphitized co-cokes, and anthracites were characterized using X-ray diffraction, Raman spectroscopy, and temperature-programmed oxidation. Through evaluation of relationships between structural parameters, it was observed there is better likelihood to obtain isotropic or near-isotropic graphite from co-cokes than anthracites. The addition of coal to petroleum feed, i.e., vacuum resid or decant oil, reduces the concentration of large isochromatic units in a co-coke structure, thus leading to a graphitic structure that lacks anisotropic character upon graphitization of the co-coke. The structural characteristics of graphitized anthracites showed more similarities to anisotropic commercial graphite, in comparison to graphitized co-cokes. It was also found that coking a vacuum resid/coal blend offers better potential for producing an isotropic or near-isotropic graphite than the coking of a decant oil/coal blend. Increasing the co-coking temperature from 465 to 500 C appeared to favor obtaining isotropic or near-isotropic graphite upon graphitization.

Original languageEnglish (US)
Pages (from-to)2280-2285
Number of pages6
JournalEnergy and Fuels
Volume28
Issue number3
DOIs
StatePublished - Mar 20 2014

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Anthracite
Graphite
Coal
Petroleum
Crude oil
Coking
Graphitization
Coke
Oils
Vacuum
Raman spectroscopy
X ray diffraction
Oxidation
Temperature

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Energy Engineering and Power Technology
  • Fuel Technology

Cite this

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title = "Comparative study on structural parameters of graphitized coal-petroleum co-cokes and pennsylvania anthracites, with implications for their use",
abstract = "Nuclear-grade graphite samples, anisotropic commercial graphite, graphitized co-cokes, and anthracites were characterized using X-ray diffraction, Raman spectroscopy, and temperature-programmed oxidation. Through evaluation of relationships between structural parameters, it was observed there is better likelihood to obtain isotropic or near-isotropic graphite from co-cokes than anthracites. The addition of coal to petroleum feed, i.e., vacuum resid or decant oil, reduces the concentration of large isochromatic units in a co-coke structure, thus leading to a graphitic structure that lacks anisotropic character upon graphitization of the co-coke. The structural characteristics of graphitized anthracites showed more similarities to anisotropic commercial graphite, in comparison to graphitized co-cokes. It was also found that coking a vacuum resid/coal blend offers better potential for producing an isotropic or near-isotropic graphite than the coking of a decant oil/coal blend. Increasing the co-coking temperature from 465 to 500 C appeared to favor obtaining isotropic or near-isotropic graphite upon graphitization.",
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Comparative study on structural parameters of graphitized coal-petroleum co-cokes and pennsylvania anthracites, with implications for their use. / Nyathi, Mhlwazi S.; Clifford, Caroline Elaine; Schobert, Harold H.

In: Energy and Fuels, Vol. 28, No. 3, 20.03.2014, p. 2280-2285.

Research output: Contribution to journalArticle

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