Studies of the acidity and ionic conductivity of silica-supported heteropoly compounds. II. Acidity and catalytic activity of supported heteropoly compound catalysts.

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概要

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• The acidity function, <I>H</I><SUB>0</SUB>, of silica-supported heteropoly compounds (HPC) such as H<SUB>3</SUB>PMo<SUB>12</SUB>O<SUB>40</SUB>, H<SUB>3</SUB>PW<SUB>12</SUB>O<SUB>40</SUB>, and their sodium, potassium, ammonium, cesium, and bismuth oxide salts has been examined in connection with their catalytic activity for the dehydration of <I>t</I>-butyl alcohol (TBA). The values of <I>H</I><SUB>0</SUB> for the respective catalysts have been determined spectrophotometrically utilizing adsorbed dicinnamylideneacetone (DCA) as a probe molecule. A linear relationship has been established between the amount of HPC supported (log<I>m</I>) and its <I>H</I><SUB>0</SUB>. Also, for the dehydration of TBA in the liquid-phase all plots of log<I>k</I><SUB>1</SUB>′ vs. <I>H</I><SUB>0</SUB> fall on a straight line with a slope of −1, independent of the kind of catalyst. In this case <I>k</I><SUB>1</SUB>′ is the apparent rate constant of the dehydration of liquid TBA. On the other hand, for the gas-phase dehydration of TBA the plots yield straight lines with different slopes, depending on the type of catalyst. The dependence of the catalytic activity on the <I>H</I><SUB>0</SUB> supports the previous conclusion that the dehydration of liquid and gaseous TBA proceeds through pseudo-liquid and outer-surface mechanisms, respectively.

• 公益社団法人 日本化学会の論文

著者

• Morioka Yoshio

  Department of Applied Chemistry, Faculty of Engineering, Shizuoka University

• Kobayashi Jun-ichi

  Department of Applied Chemistry, Faculty of Engineering, Shizuoka University

• Ohtsuka Reiji

  Department of Applied Chemistry, Faculty of Engineering, Shizuoka University

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• Studies of the acidity and ionic conductivity of silica-supported heteropoly compounds. II. Acidity and catalytic activity of supported heteropoly compound catalysts.
• Studies of the acidity and ionic conductivity of silica-supported heteropoly compounds. I. The dehydration of t-butyl alcohol over heteropoly compound catalysts.

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