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Kinetics and C-13 NMR study of oxygen incorporation into PVC- and pitch-derived materials
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Altoe, Gisele F., Freitas, Jair C. C., Cunha, Alfredo G., Emmerich, Francisco G. and Smith, Mark E. (2009) Kinetics and C-13 NMR study of oxygen incorporation into PVC- and pitch-derived materials. Energy & Fuels, Vol.23 (No.3 Sp. Iss. SI). pp. 1373-1378. doi:10.1021/ef8009926 ISSN 0887-0624.
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Official URL: http://dx.doi.org/10.1021/ef8009926
Abstract
The kinetics of oxygen incorporation into a PVC-derived material with pitch-like characteristics was studied by isothermal thermogravimetric analysis at temperatures ranging from 200 to 270 degrees C. Activation energy, Ea, pre-exponential factor, A, and rate constants, k(T), were obtained from the weight-gain curves recorded during reactions of the material with molecular oxygen, which were analyzed following a kinetic first-order model. The numerical values obtained were E-a = 100.5 kJ/mol and A = 1.6 x 10(10) h(-1). The extent of the oxidation at a fixed temperature was monitored by elemental analysis, and the chemical changes in the materials were followed by solid-state C-13 NMR. The study was next extended to the chars obtained from three coal tar pitches with different softening points (55, 85, and I 10 degrees C). Comparisons were then established between the determined kinetic parameters and the chemical/structural aspects and compositions of each analyzed material.
Item Type: | Journal Article | ||||
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Subjects: | T Technology > TJ Mechanical engineering and machinery T Technology > TP Chemical technology |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Energy & Fuels | ||||
Publisher: | American Chemical Society | ||||
ISSN: | 0887-0624 | ||||
Official Date: | March 2009 | ||||
Dates: |
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Volume: | Vol.23 | ||||
Number: | No.3 Sp. Iss. SI | ||||
Number of Pages: | 6 | ||||
Page Range: | pp. 1373-1378 | ||||
DOI: | 10.1021/ef8009926 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Funder: | NMR, CNPq, CAPES, FINEP |
Data sourced from Thomson Reuters' Web of Knowledge
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