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KMID : 1059519880320030171
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Journal of the Korean Chemical Society
1988 Volume.32 No. 3 p.171 ~ p.178
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Desorption of Water, Ammonia, and Methylamines on K+ Ion Exchanged Zeolite L
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Moon Sung-Doo
Choi Dai-Ung
Kim Un-Sik
Kim Yang
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Abstract
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The potential energy of adsorbate molecules in the main channel of K+ ion exchanged zeolite L(K-L) was calculated. In K-L which adsorbs three molecules per unit cell, the interaction energies of H2O, NH3, CH3NH2, (CH3)2NH, and (CH3)3N molecules with zeolite lattice are 61.11, 62.31, 65.68, 74.65, and 79.88kJ/mol, respectively. These values are less by 3.7∼12.6kJ/mol than K+ ion affinities with adsorbing molecules. These results may be due to the facts that the electrostatic energies are reduced by the negative charge of the lattice oxygens. The distribution of adsorption sites of NH3 and CH3NH2 in K-L was investigated by a technique of temperature programmed desorption. The experimental value of desorption energies of NH3 and CH3NH2 on K-L are in good agreement with the theoritical values. It is concluded that the desorption of NH3 and CH3NH2 on K-L is the first-order desorption with free readsorption.
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