Validity of energy distribution derived from heat of adsorption in an ammonia/cation-exchanged Y zeolite system

Abstract

The validity ofε-Θ functions (energy level functions) which were derived from experimentalq-Θ functions (heat functions) was examined in an ammonia/cation-exchanged Y zeolite system. Theε-Θ functions of Na-Y zeolite and Cs-Na-Y zeolite were respectively calculated from theirq- Θ functions measured by ammonia adsorption at 373 K. The heat of adsorption of ammonia was also measured on a mixture of these two zeolites at a certain mixing ratio at 373 K. Theε-Θ function of the mixture was likewise calculated on the basis of this measurement. Theε-Θ function thus calculated was in good agreement with the synthesizedε-Θ function derived by linearly combining twoε-Θ functions of each zeolite mentioned above. Theε-Θ function derived from experimentalε-Θ function thus proved to be valid in an actual adsorption system.