The adsorption mechanism of methanol on alkali halides.

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概要

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• The amounts of methanol adsorbed on (100) planes of the crystals of six alkali halides (LiCl, NaCl, NaBr, KCl, KBr, and KI) and the isosteric heats of their adsorption were measured. For the chloride samples, the order of magnitude of the adsorption heats at a coverage of θ=0.5 was found to be LiCl>NaCl>KCl, while the order for the bromide samples was NaBr>KBr. The monolayer capacities estimated from the adsorption isotherms for KCl and NaBr were in accord with the values calculated by assuming that one methanol molecule is adsorbed on one surface anion of the crystal. In the cases of the NaCl and LiCl salts, whose lattice spacings are smaller than that of NaBr, the methanol molecule was adsorbed on the surface anion with a ratio below 1 : 1. On the other hand, for the KBr and KI samples, whose lattice spacings are larger than that of KCl, alcohol was adsorbed on the surface anion in a ratio above 1 : 1. These phenomena are reasonably interpreted in terms of a relationship between the cross-sectional area of a methanol molecule and the lattice spacing of the salt concerned. An adsorptive mechanism deduced from the isosteric heat curves was compatible with the above explanation.

• 公益社団法人 日本化学会の論文

著者

• Chikazawa Masatoshi

  Department of Industrial Chemistry, Faculty of Technology, Tokyo Metropolitan University

関連論文

• The adsorption mechanism of methanol on alkali halides.

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