Abstract
The rates of reaction of a spherical specimen of Speer Moderator-2 graphite with low partial pressures of carbon dioxide and water vapor were determined in flowing helium at a total pressure of 1 atm. The rates were obtained from weight changes of the specimen and from analyses of the effluent gases. The activation energy for the CO 2-graphite reaction was determined between 875 and 1025°C at carbon dioxide concentrations of 550 and 1100 vpm. The apparent order of this reaction was established at 975°C using carbon dioxide concentrations ranging from 60 to 1650 vpm. The temperature coefficient of the H 2O-graphite reaction was measured at temperatures of 825 to 1025°C using water vapor concentrations of 110 and 460 vpm. The apparent order of this reaction was established at 975°C in the water vapor concentration range of 20–760 vpm. The retardation of the H 2O-graphite reaction by hydrogen and carbon monoxide additions was studied.
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