Abstract
1. The DAK-1-1 calorimeter is similar to the standard Tian-Calvet calorimeter, but it also acquires the features of a double calorimeter in the compensation mode. The operating characteristics of the instrument and its advantages and disadvantages were analyzed; ways of improving the device were indicated. 2. The different heats of adsorption of methanol vapors on silicalite were measured. The zeolite contains a small amount of hydroxyl groups which chemically react with methanol with the formation of surface methoxyl groups. The methanol fills the sorption space of the silicalite by only 80%. The adsorbing channels of silicalite are a homogeneous microporous system in which collective adsorbate-adsorbate interactions are clearly manifested. 3. Calculation of the heat of adsorption of water vapors on silicalite according to an additive scheme as the difference between the heat of adsorption of methanol and the increment of the heat of adsorption on the CH2 group produced a value of ∼33 kJ/mole, which is significantly lower than the heat of condensation of water vapors. This the cause of the hydrophobicity of silicalite.
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