Fundamental Studies on Palladium Catalysts. IX. Characteristics of Hydrogen Sorption and Hydrogenation Activity of Supported Palladium Catalysts
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概要
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The sorption of hydrogen and the hydrogenation of ethylene on palladium/silica–alumina catalysts with palladium contents of 0.58–4.5 wt% were investigated. It was found that <I>V</I><SUB>x</SUB> (the amount of molecularly-adsorbed hydrogen) and <I>V</I><SUB>z</SUB> (that of dissociatively-adsorbed hydrogen) increase, while <I>V</I><SUB>y</SUB> (that of dissolved hydrogen) decreases, with the increase in the specific surface area of palladium, and that the saturated value of <I>V</I><SUB>z</SUB> is proportional to the amount of chemisorbed carbon monoxide. It was also shown that the increase in the palladium content results in a growth of the palladium crystallites, their number staying approximately constant. The rate of ethylene hydrogenation was found to be first-order with respect to hydrogen and zero-order with respect to ethylene over the temperature range of −20–20 °C. The activity was proportional to the surface area of palladium, and the activation energy was almost constant for these catalysts.
- 公益社団法人 日本化学会の論文
著者
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Suzuki Sadao
Research Laboratory of Resources Utilization, Tokyo Institute of Technology
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Uehara Masaru
Research Laboratory of Resources Utilization, Tokyo Institute of Technology, Ookayama
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Yamabe Tsunekichi
Research Laboratory of Resources Utilization, Tokyo Institute of Technology, Ookayama
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Shirono Katsuhiro
Research Laboratory of Resources Utilization, Tokyo Institute of Technology, Ookayama
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