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Abstract 1) The surface properties of two kinds of alumina have been studied by measuring the immersion heats and the water contents. The heat of immersion of alumina showed a maximum at about 600∼650°C, which is considerably higher than the 200∼300°C of silica, and the heat values were much greater than those of silica. 2) It has been concluded that the rehydration process of dehydrated sites plays an important role in the case of the immersion of alumina in water. The heats of hydration calculated from the immersion heats of α- and γ-alumina were 15.8 and 9.60 kcal./mol. water respectively.
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Morimoto et al. (1964) studied this question.
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