Kinetic study of the changes in element occurrence during low-temperature oxidation of coal
Complex macromolecular matrix of coal is divided into the elements of C, O, H, S and N, which are all involved into the concerned reaction. Based on the changes in element occurrence during coal oxidation at low temperature, the pseudo-first-order reaction kinetics was used to evaluate the kinetic characteristics of coal oxidation. Coats and Refern's as well as Horowiz and Metzger's models were also used to model the changes in element occurrence. The activation energies obtained by the pseudo-first order kinetic have been found to be almost similar to those calculated by applying the Coats and Redfern's equation and the energies are higher when Horowitz and Metzger's equation is applied. The release of element H shows the highest rate constants (K) and lowest activation energy value (E-a) when compared with these values for C and N. A kinetic compensation effect between K and E-a was observed for the changes in element occurrence.
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