Adsorption on transition aluminas from in situ capacitance measurements

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• 作者：Caldararu ; Monica ; Postole ; Georgeta ; Carata ; Mariana ; Hornoiu ; Cristian ; Ionescu ; Niculae I. ; et. al.
• 关键词：82.65.Jv ; 77.22.-d ; 82.80.-ch ; Alumina ; Capacity ; Dielectric constant ; Dehydration ; Water adsorption ; Propylene adsorption
• 刊名：Applied Surface Science
• 出版年：2003
• 出版时间：February 28, 2003
• 年：2003
• 卷：207
• 期：1-4
• 页码：318-326
• 全文大小：186 K

文摘

The interaction of water or propylene dipoles with surface of γ-Al₂O₃ and of a boehmite type alumina between room temperature and 400°C was evaluated from evolution of the apparent capacity/dielectric constant during thermal cycling and under flushing with dry or humid gases (argon, oxygen) and with a mixture containing propylene and air (i.e. in conditions which mimic the catalytic experiment). Data allowed to stipulate that the extent of weak adsorption was higher on γ-Al₂O₃, in relation with the higher amount of surface OH groups, as supported by IR data.