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Kinetics and 13C NMR Study of Oxygen Incorporation into PVC- and Pitch-Derived Materials

Research output: Contribution to Journal/MagazineJournal articlepeer-review

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  • Gisele F. Altoe
  • Jair C. C. Freitas
  • Alfredo G. Cunha
  • Francisco G. Emmerich
  • Mark E. Smith
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<mark>Journal publication date</mark>19/03/2009
<mark>Journal</mark>Energy and Fuels
Issue number3
Volume23
Number of pages6
Pages (from-to)1373-1378
Publication StatusPublished
<mark>Original language</mark>English

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 °C. Activation energy, Ea, 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 Ea = 100.5 kJ/mol and A = 1.6 × 1010 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 13C NMR. The study was next extended to the chars obtained from three coal tar pitches with different softening points (55, 85, and 110 °C). Comparisons were then established between the determined kinetic parameters and the chemical/structural aspects and compositions of each analyzed material.