STRUCTURE AND ACTIVITY OF SUPPORTED METAL-CATALYSTS .7. CO POISONING AND METAL LOCATION IN PALLADIUM-CHARCOAL CATALYSTS
STRUCTURE AND ACTIVITY OF SUPPORTED METAL-CATALYSTS .7. CO POISONING AND METAL LOCATION IN PALLADIUM-CHARCOAL CATALYSTS
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DOI：
10.1016/0021-9517(73)90177-2
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发表时间：
1973-01-01
影响因子：
7.3
通讯作者：
MOSS, RL
中科院分区：
文献类型：
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作者：
POPE, D;WALKER, DS;MOSS, RL
能够在非常低的温度下在气相中催化乙烯氢化的1%Pd-炭催化剂被反应物流中浓度为0.5- 2.5ppm的CO毒化。这些催化剂的制剂，含有广泛分布的Pd微晶，是不太容易中毒比制备微晶位于木炭颗粒边缘所示的电子显微镜。发现催化剂被0.75ppm CO使乙烯氢化失活所需的时间与这些催化剂对甲基丁烯醇或硝基苯的液相氢化的已知活性之间存在相关性。出现这些相关性是因为液相氢化速率是扩散限制的，并且像CO中毒时间一样取决于Pd微晶在木炭载体内的位置。
1% Pd-charcoal catalysts capable of catalyzing ethylene hydrogenation in the gas phase at very low temperatures were poisoned by CO concentrations of 0.5–2.5 ppm in the reactant stream. Preparations of these catalysts, containing widely distributed Pd crystallites, were less susceptible to poisoning than preparations where the crystallites were located at the charcoal granule edges as shown by electron microscopy. Correlations were found between the time required for catalysts to be rendered inactive for ethylene hydrogenation by 0.75 ppm CO and the known activities of these catalysts for the liquid-phase hydrogenation of methylbutenol or nitrobenzene. These correlations arise because the liquid-phase hydrogenation rates are diffusion-limited, and like the CO poisoning times are dependent upon the location of the Pd crystallites within the charcoal support.