アロフェン・イモゴライトの水和エンタルピー測定と熱交換材としての評価

概要

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The hydration enthalpies of allophane and imogolite have been measured by means of the adiabatic vapor absorption calorimeter. The hydration enthalpy(⊿H_h)of allophane and imogolite were -63.2kJ/mol and -59.8kJ/mol, respectively, which were almost the same as those of a zeolite group. The total heat of hydration (Q)of allophase was 409kJ/kg at the dehydration temperature of 80℃, and was 1.5 times larger than that of the Mg-A type zeolite, The Q-value of imogolite was 405 kJ/kg at the dehydration temperature of 40℃, and was 2.2 times larger than that of the Mg-A type zeolite. Allophane and imogolite are thus characterized by larger Q-values than that of Mg-A type zeolite when they are dehydrated at low temperature below 100℃. The shows that allophane and imogolite are suitable for heat exchange absorbents of zeolite-water heat pumps for low temperature heat sources.
社団法人日本セラミックス協会の論文
2001-08-01