Abstract
Previous studies of high pressure retorting under hydrogen have reported large increases in the Fischer assay oil yield for carbonaceous shales. A high temperature, high pressure, electron spin resonance cavity has been constructed and used to measure spin concentrations of the radicals during pyrolysis. The results are independent of the gas and do not show the expected reduction in spin concentration for hydrogen due to hydrogen capping; this can be explained by the failure of steady state electron spin resonance measurements to detect rapid radical formation and decay processes.
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