Oxidation kinetics and nanostructure of model carbons based on TGA data

I. C. Jaramillo, J. Levinthal, J. S. Lighty, C. K. Gaddam, Randy Lee Vander Wal

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Oxidation kinetics and fringe analysis studies of three "model" carbons, ranging from amorphous to onionlike nanostructures were performed in a thermogravimetric analyzer (TGA). The carbons were oxidized isothermally at temperatures ranging from 575 to 775 o C in air using a TGA Q600. Multiple tests were performed to obtain the most favorable operating conditions to minimize mass-transfer diffusion limitations. First-order reaction kinetics and an Arrhenius-type equation were used to extract the rate constants at each temperature. The activation energies for the oxidation of the carbon samples ranged from 124 to 204 kJ/mol. The onion-like structure exhibited a slower kinetic rate compared to the amorphous M1300. For Regal 250 carbon, the kinetic rate changed during oxidation and Differential Scanning Calorimeter (DSC) analysis suggested the formation of a new compound (still to be identified) at higher conversions. The fringe analysis explained the differences in the kinetic parameters between carbon samples studied. The onion ike nascent sample had a longer range of fringe lengths and smaller tortuosity, suggesting a flatter structure; the nascent M1300, had a much shorter fringe length and broader tortuosity, suggesting more curvature. The nascent R250 nanostructure was between the other two carbons.

Original languageEnglish (US)
Title of host publication8th US National Combustion Meeting 2013
PublisherWestern States Section/Combustion Institute
Pages1555-1564
Number of pages10
Volume2
ISBN (Electronic)9781627488426
StatePublished - 2013
Event8th US National Combustion Meeting 2013 - Park City, United States
Duration: May 19 2013May 22 2013

Other

Other8th US National Combustion Meeting 2013
CountryUnited States
CityPark City
Period5/19/135/22/13

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Mechanical Engineering
  • Physical and Theoretical Chemistry

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  • Cite this

    Jaramillo, I. C., Levinthal, J., Lighty, J. S., Gaddam, C. K., & Vander Wal, R. L. (2013). Oxidation kinetics and nanostructure of model carbons based on TGA data. In 8th US National Combustion Meeting 2013 (Vol. 2, pp. 1555-1564). Western States Section/Combustion Institute.