中国産カオリナイト質粘土を選択溶解処理して調製したメソポア材料の水蒸気吸着特性

概要

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To develop a humidity self-controlling material, mesoporous clay samples have been prepared through selective leaching of calcined Chinese kaolinitic-clays (Suzou-Kaolin, Coal-Kaolin and Black-Clay). These samples were calcined for 1 hour at 900℃, 1000℃, and 1100℃. Each 100g of the calcined samples was suspended in 500ml of 1N KOH solution for 24 hours at 90℃. The mesoporous clay materials obtained from Suzou-Kaolin and Coal-Kaolin showed a very narrow pore size distribution at around 20-30Å in pore radius and with the specific surface areas at around 90m^2/g and 70m^2/g. The total pore volumes were 0.20ml/g for Suzou-Kaolin and 0.12ml/g for Coal-Kaolin, respectively. The water vapor adsorption isotherms showed a rapid increase at relative humidity (RH) of about 60%. The amount of water vapor adsorption at RH=90% for the same samples were 14mass% and 11mass%, respectively. On the other hand, Black-Clay which contains small amount of impurity iron, alkali and alkaline earth elements, showed a gradual increase in water vapor adsorption up to RH=90%. From the results of water vapor adsorption and desorption measurements, the mesoporous materials prepared through selective leaching of silica from calcined Chinese kaolinitic clays (Suzou-Kaolin and Coal-Kaolin) showed good quality samples for humidity self-controlling material.
1997-03-31