The thermal decomposition of six different samples of wood and leaves in nitrogen ahs been studied by using dynamic thermogravimetry. In the experiments two main weight loss processes took place and the total weight loss at 500 deg. C was over 95/100 in all six cases. By means of the Doyle method, the two processes were found to fit most closely the plot for the second-order equation in the form dα/dt = k(1-α)~2, and each of the weight loss processes was found to be controlled, respectively, by two dominant reactions as the temperature increases. It was inferred that competing reactions occur during the overall temperature interval for all the six samples.
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