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Return to Abstracts of Literature 1500-1749
1697. KAWAKITA, K. Chemisorption of Carbon Dioxide by Reduced Iron. I. Interaction of Carbon Monoxide and Carbon Dioxide With the Reduced Iron. Rev. Phys. Chem. Japan, vol. 8, 1934, pp. 89-116; vol. 11, 1937, pp. 39-53; chem. Abs., vol. 31, 1937, p. 3759; vol. 32, 1938, p. 403.
In chemisorption of CO2 by reduced Fe an irreversible sorption always takes place in the normal state of the activity of the catalyst, the amount of the sorption being proportional to the square root of time in the intermediate state of the sorption. The final pressure of CO2 always approaches zero. Some selectivity of catalytic action was found with catalysts of various activities and mixtures of CO and CO2. Sievertsí law, that the amount of sorption is proportional to the square root of the pressure, seems to hold. It is suggested the chain reaction is Fe+(CO2)ads.=FexOy+(CO)ads.; COads.=1/2C+1/2(CO2)ads.. Facts indicating these reactions are: (a) The catalyst, saturated with CO2, recovers its activity, forming water, by its re-reduction with H2; (b) the formation of free C was observed; (c) the sorption is irreversible and has some self-poisoning. The activity of the catalyst may be accomplished by saturating it with CO2, by poisoning and by sintering.