Evaluation of energy distribution on a heterogeneous surface from heat of adsorption and its application to the ammonia/Na-Y zeolite system |
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Authors: | K. Tsutsumi Y. Mitani H. Takahashi |
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Affiliation: | (1) Present address: Toyohashi University of Technology, Toyohashi, Japan;(2) Institute of Industrial Science, The University of Tokyo, Japan;(3) Present address: Tokuyama Soda Co. Ltd., Mikage-cho, 745 Tokuyama, Japan |
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Abstract: | The — function (energy level function) which represents surface heterogeneity was derived from theq— function (experimental heat function) in the case of reversible adsorption. The Langmuir equation was extended and applied to the procedure of calculations. An iterative calculation led to the most probable — function by setting theq— function and adsorption temperature. As an example for actual cases, the — function of Na-Y zeolite was calculated from theq— function obtained by the measurement of heats of adsorption of ammonia at 373 K. The — function thus derived seemed to be consistent with the positional distribution of sodium ions. |
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Keywords: | Energy distribution heterogeneous surface heat of adsorption zeolite |
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