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1983•Bulletin of the Chemical Society of JapanRequires access

The Adsorption of Chloromethanes on KCl. The Role of the Surface Ions as Adsorption Sites

Masatoshi Chikazawa, Masatoshi Amada, Takafumi Kanazawa

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Abstract

Abstract The adsorbed amounts of chloro-substituted methanes, such as CH2Cl2, CHCl3, and CCl4, for KCl particles were measured by a volumetric method at various temperatures, and the isosteric heats of adsorption and differential entropies of the adsorbed molecules were estimated from the adsorption isotherms. The order of magnitude of the heats of adsorption at a coverage of θ=0.5 was found to be CH2Cl2>CHCl3>CCl4. Moreover, a plot of the dipole moments of the three adsorbates vs. the adsorption heat values gave a straight line. Therefore, the differences among the adsorption heats of the three adsorbates is mainly caused by an orientation of their dissimilar dipoles to the surface. It may be concluded that the chloro-substituted methanes are adsorbed on surface anions of KCl powder.

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Abstract The adsorbed amounts of chloro-substituted methanes, such as CH2Cl2, CHCl3, and CCl4, for KCl particles were measured by a volumetric method at various temperatures, and the isosteric heats of adsorption and differential entropies of the adsorbed molecules were estimated from the adsorption isotherms. The order of magnitude of the heats of adsorption at a coverage of θ=0.5 was found to be CH2Cl2>CHCl3>CCl4. Moreover, a plot of the dipole moments of the three adsorbates vs. the adsorption heat values gave a straight line. Therefore, the differences among the adsorption heats of the three adsorbates is mainly caused by an orientation of their dissimilar dipoles to the surface. It may be concluded that the chloro-substituted methanes are adsorbed on surface anions of KCl powder.

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Available abstract

Abstract The adsorbed amounts of chloro-substituted methanes, such as CH2Cl2, CHCl3, and CCl4, for KCl particles were measured by a volumetric method at various temperatures, and the isosteric heats of adsorption and differential entropies of the adsorbed molecules were estimated from the adsorption isotherms. The order of magnitude of the heats of adsorption at a coverage of θ=0.5 was found to be CH2Cl2>CHCl3>CCl4. Moreover, a plot of the dipole moments of the three adsorbates vs. the adsorption heat values gave a straight line. Therefore, the differences among the adsorption heats of the three adsorbates is mainly caused by an orientation of their dissimilar dipoles to the surface. It may be concluded that the chloro-substituted methanes are adsorbed on surface anions of KCl powder.

Key concepts: Chemistry, Adsorption, Dipole, Molecule, Ion, Inorganic chemistry, Physical chemistry, Organic chemistry

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