Abstract
The Hüttig-type adsorption equation on mixed gas adsorption was derived assuming that the molecules in the 1st layer were localized, and the molecules in the 2nd or higher layers behaved as gases with molecules in a different potential from that of gas molecules. The surface areas were separately obtained by the application of this adsorption equation to the experimental total adsorption isotherms or component adsorption isotherms. The suitability of this equation for the component adsorption isotherms from the mixed gases of O2 and N2 on anatase at 77K was investigated in comparison with that of the extended BET adsorption equation for mixed gas adsorption of the experimental isotherms.
The suitability showed good agreement in the range of 0.05 and 0.5 in relative pressure. This adaptable range had a wider range than that of the extended BET adsorption equation. The surface areas obtained separately by the adaptation of the equation to the experimental total adsorption isotherms and component adsorption isotherms showed reasonable agreement with those obtained from the adaptation of the Hüttig-type adsorption equation of the single component adsorption for the experimental single component adsorption isotherms. From these results, even in the adsorbed phase of the mixed gas adsorption, the model of the Hüttig-type adsorption equation for mixed gas adsorption was perceived to be much more reasonable than that of the localized model of the extended BET equation for mixed gas adsorption in the relative pressure range of 0.05 and 0.5.
