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. ISSN 0887-0624

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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
Subjects:	T Technology > TJ Mechanical engineering and machinery T Technology > TP Chemical technology
Divisions:	Faculty of Science > Physics
Journal or Publication Title:	Energy & Fuels
Publisher:	American Chemical Society
ISSN:	0887-0624
Date:	March 2009
Volume:	Vol.23
Number:	No.3 Sp. Iss. SI
Number of Pages:	6
Page Range:	pp. 1373-1378
Identification Number:	10.1021/ef8009926
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	NMR, CNPq, CAPES, FINEP
URI:	http://wrap.warwick.ac.uk/id/eprint/28066

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