Abstract
The effects of homogeneous additives upon the thermal degradation of subbituminous coal are described. Additives consisting of zinc chloride, sodium carbonate, lead nitrate, sodium titanate or sodium molybdate were blended into separate coal samples. Using Curie-point pyrolysis at 610°C monitored by mass spectrometry data were determined on the samples, both in an “as received” state and following reduction in a flowing H 2-H 2O stream. Data show that specific chemical additives are effective in altering pyrolysis distributions. Likewise additives alter the extent of methanol retention during sample preparation. These data are explained through a coal model that suggests these additives alter mass transport rates of volatile compounds exiting from these coaly materials and that such volatiles are the predominant features produced during coal pyrolysis.
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