Abstract
In this study, chars produced by flash pyrolysis or hydropyrolysis of low-rank Canadian coals were gasified in an air atmosphere using the temperature-programmed-reaction (TPR) method. It was observed that some chars gasify in what appears to be two steps. It is possible to fit the two-step data by use of a simple model that fits the continuous weight loss data well by assuming parallel gasification of two chars of different reactivities. It seems likely that two-step gasification indicates chars of nonuniform reactivity or uneven ash distribution
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