Kinetics and {sup 13}C NMR study of oxygen incorporation into PVC- and pitch-derived materials
- Universidade Federal do Esprito Santo, Vitria (Brazil). Departamento de Fsica
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{sup o}C. Activation energy, E{sub a}, pre-exponential factor, A, and rate constants, kT, 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{sub a} = 100.5 kJ/mol and A = 1.6 x 1010 h{sup -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 {sup 13}C NMR. The study was next extended to the chars obtained from three coal tar pitches with different softening points (55, 85, and 110{sup o}C). Comparisons were then established between the determined kinetic parameters and the chemical/structural aspects and compositions of each analyzed material. 23 refs., 7 figs., 3 tabs,
- OSTI ID:
- 21187095
- Journal Information:
- Energy and Fuels, Vol. 23, Issue 3; ISSN 0887-0624
- Country of Publication:
- United States
- Language:
- English
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