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The experimental investigation into the kinetics of the carbon-steam reaction was made by suspending a 1/2-¡n. diameter graphite rod in a thermally controlled vertical tube furnace. Steam passed into the furnace with nitrogen as a carrier gas. The weight loss of the graphite sample was measured by an externally mounted analytical balance located above the reaction tube. While the reaction pressure was maintained constant at about 1 atm, the variables explored were the reaction temperature between 500 and 900°C, the gas flow rate between 5 and 15 cm/sec, and the partial pressure of the water vapor between 7 and 12 cm Hg. A measured activation energy of 16,370 cal/mol was close to reported values for similar temperatures. The data indicated an almost entirely surface reaction controlling model even at the highest temperature investigated. In the 700-900°C temperature range at the low partial pressure of water vapor, the diffusion model contributed only about 1-2% of the total resistance.

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