Hydrogen Redistribution of Acetone on ZnO Catalysts

スポンサーリンク

概要

• 論文の詳細を見る

• The hydrogen redistribution reaction between <I>d</I><SUB>0</SUB>-acetone and <I>d</I><SUB>6</SUB>-acetone was carried out at −10–60 °C over ZnO catalysts subjected to various modes of pretreatment. The activity of ZnO was several times larger than that of Zn metal, being hardly affected by the conditions of pretreatment below 350 °C and illumination with a mercury lamp. The rate of hydrogen redistribution was proportional to the amount of chemisorbed acetone which obeys the Langmuir adsorption isotherm. The activation heat of redistribution and the heat of acetone chemisorption were estimated to be 14±2 and 10±1 kcal/mol, respectively. The time course of the relative amounts of <I>d<SUB>n</SUB></I>-acetones, independent of the catalyst or its activity, was reproducible by a calculation based on the stepwise exchange model for the hydrogen exchange of acetone. About half of the chemisorbed acetone was found to be active for the redistribution or exchange of hydrogen. From the results and IR spectrometric study of acetone adsorbed on ZnO, the hydrogen redistribution of acetone was concluded to proceed <I>via</I> a chemisorbed acetone with an enol type configuration on a pair of sites, Zn<SUP>2+</SUP>–O<SUP>2−</SUP>, of ZnO surface.

• 公益社団法人 日本化学会の論文

著者

• Miyahara Koshiro

  Research Institute for Catalysis, Hokkaido University

• Nagai Ken-ichi

  Research Institute for Catalysis, Hokkaido University

• Tanaka Ken-ichi

  Research Institute for Catalysis, Hokkaido University

関連論文

• Hydrogen Redistribution of Acetone on ZnO Catalysts
• Isotopic Study of Water Gas Reaction Catalyzed by Platinum
• XPS study of silica-supported copper catalyst derived from binuclear copper(II) acetate monohydrate or mononuclear tetraammine copper(II) complex.
• Amorphous Ni-Ti and Ni-Zr alloys for water electrolysis cathode materials.

スポンサーリンク