Kinetics and C-13 NMR study of oxygen incorporation into PVC- and pitch-derived materials
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 0887-0624Full text not available from this repository.
Official URL: http://dx.doi.org/10.1021/ef8009926
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|
|Number:||No.3 Sp. Iss. SI|
|Number of Pages:||6|
|Page Range:||pp. 1373-1378|
|Access rights to Published version:||Restricted or Subscription Access|
|Funder:||NMR, CNPq, CAPES, FINEP|
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