Abstract
The gas evolution during the oxygen chemisorption on coal char was determined together with the monitoring of weight change. From these data, the detailed mass balance during chemisorption was established. The addition of Ca to char accelerates the Co 2 evolution, whereas there was no effect on CO evolution. Approximately 70% of the reacted oxygen was trapped on the char surface. The stabilities of these trapped oxygen complexes were determined by a subsequent temperature-programmed desorption (TPD) experiment
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