Adsorption of carbon dioxide and coadsorption of carbon dioxide and hydrogen on iron: I. Volumetric measurements,adsorption isotherms,changes in resistance and work function

The adsorption of CO₂ on thin evaporated iron films is studied at 196, 273, 300 and 370 K by means of volumetric measurements and measurements of equilibrium pressures, changes in work function and electrical resistance. Preadsorbed hydrogen only slightly influences the amount of a consecutive CO₂ adsorption at 273 K, but has a strong influence on the change in resistance due to the CO₂ adsorption. An iron film totally covered with CO₂ at 273 K is able to adsorb further hydrogen. Carbon dioxide and hydrogen seem not to compete for the same adsorption sites.