A simple kinetic analysis to determine the intrinsic reactivity of coal chars

Edwige Sima-Ella, Gang Yuan, Tim Mays

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

The intrinsic oxidn. reactivity in air of an activated carbon char derived from bituminous coal was investigated using a new thermogravimetric anal. (TGA) method. Applying the new method, values of the Arrhenius activation energy E and pre-exponential factor A were estd. from TGA data obtained via heating samples at different const. rates. A novel statistical criterion was subsequently used to det. the heating rate at which optimum values of E and A were obtained. This is a valuable development, for in conventional non-isothermal TGA, while Arrhenius parameters vary with heating rate, there is no formal method for selecting one rate (and hence one set of values of E and A) over another. Using this new method, the following optimum values were obtained for the carbon at a heating rate of 25 Deg min-1: E=129.4 kJ mol-1 and ln(A//s)=10.4. These results are similar to those calcd. for the same material using more time consuming and less accurate isothermal TGA methods. It is therefore proposed that this new anal. method might be an improvement on conventional techniques to det. the intrinsic oxidn. reactivity in air of coal chars. [on SciFinder (R)]
LanguageEnglish
Pages1920-1925
Number of pages6
JournalFuel
Volume84
Issue number14-15
StatusPublished - 2005

Fingerprint

Coal
Heating rate
Kinetics
Formal methods
Bituminous coal
Air
Activated carbon
Carbon
Activation energy
Heating

Keywords

  • Semicoke Role
  • RACT (Reactant or reagent) (kinetic anal. to det. the intrinsic reactivity of coal chars)
  • Reactivity (kinetic anal. to det. the intrinsic reactivity of coal chars)
  • Oxidation
  • oxidn reactivity coal char
  • RCT (Reactant)

Cite this

A simple kinetic analysis to determine the intrinsic reactivity of coal chars. / Sima-Ella, Edwige; Yuan, Gang; Mays, Tim.

In: Fuel, Vol. 84, No. 14-15, 2005, p. 1920-1925.

Research output: Contribution to journalArticle

Sima-Ella, E, Yuan, G & Mays, T 2005, 'A simple kinetic analysis to determine the intrinsic reactivity of coal chars', Fuel, vol. 84, no. 14-15, pp. 1920-1925.
Sima-Ella, Edwige ; Yuan, Gang ; Mays, Tim. / A simple kinetic analysis to determine the intrinsic reactivity of coal chars. In: Fuel. 2005 ; Vol. 84, No. 14-15. pp. 1920-1925.
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AB - The intrinsic oxidn. reactivity in air of an activated carbon char derived from bituminous coal was investigated using a new thermogravimetric anal. (TGA) method. Applying the new method, values of the Arrhenius activation energy E and pre-exponential factor A were estd. from TGA data obtained via heating samples at different const. rates. A novel statistical criterion was subsequently used to det. the heating rate at which optimum values of E and A were obtained. This is a valuable development, for in conventional non-isothermal TGA, while Arrhenius parameters vary with heating rate, there is no formal method for selecting one rate (and hence one set of values of E and A) over another. Using this new method, the following optimum values were obtained for the carbon at a heating rate of 25 Deg min-1: E=129.4 kJ mol-1 and ln(A//s)=10.4. These results are similar to those calcd. for the same material using more time consuming and less accurate isothermal TGA methods. It is therefore proposed that this new anal. method might be an improvement on conventional techniques to det. the intrinsic oxidn. reactivity in air of coal chars. [on SciFinder (R)]

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