Abstract
Two kinds of graphite (ordinary artificial graphite and highly purified artificial graphite) were reacted with carbon dioxide and the effect of iodine on the reaction was investigated. Rates and activation energies of the two graphites differ considerably. The rate of reaction of highly purified graphite with carbon dioxide was found to increase when iodine was introduced into the carbon dioxide, while the effect of iodine on the reaction of ordinary artificial graphite was inhibiting. The catalytic action of vanadium was confirmed by measuring the reaction rate of highly purified graphite to which vanadium was added. The concentration of vanadium in graphite was observed to decrease with the increase of contact time with iodine. According to these observations, it is concluded that the apparent irreversible inhibiting effect of iodine is caused by iodization and gasification of vanadium which is contained in graphite and catalyzes the reaction.
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