The Heat of Adsorption from Solution. I. The Heat of Adsorption of Benzene on Silica Gel from the Benzene-Cyclohexane Solution

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概要

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• The sensitivity and reliability of the improved-flow micro-calorimeter have been examined by supplying given amounts of electric energy to the calibration heater inserted in the calorimeter. The detection limit of the heat amount was found to be 0.01 meal, and its probable error to be ±0.5 and ±0.3% at the heat evolutions of 10 and 40 meal respectively. The heat of the adsorption of benzene on silica gel from a cyclohexane solution has been measured at 30°C by the calorimeter thus constructed. The adsorption calorimetry indicates that benzene is adsorbed reversibly on silica gel, and that the differential heat of the adsorption of benzene is independent of the amount of adsorbed benzene, but that it depends strongly on the pretreatment temperature of the silica gel. The heats of adsorption were found to be 1.2, 1.6, 2.0, and 3.8 kcal/mol on silica gel samples treated at 100, 300, 500, and 800°C respectively. The findings on the heats of adsorption have been elucidated in terms of the interaction between benzene molecules and silanol groups on silica gel.

• 公益社団法人 日本化学会の論文

著者

• Morimoto Tetsuo

  Department Of Biomechanical Systems Ehime University

• Naono Hiromitu

  Department of Chemistry, Faculty of Science, Okayama University

• MORIMOTO Tetsuo

  Department of Bio-mechanical Systems, Faculty of Agriculture, Ehime University

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