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首页> 外文期刊>Catalysis science & technology >Unusual behaviour of Au/ZnO catalysts in selective hydrogenation of butadiene due to the formation of a AuZn nanoalloy
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Unusual behaviour of Au/ZnO catalysts in selective hydrogenation of butadiene due to the formation of a AuZn nanoalloy

机译：盟/氧化锌催化剂选择性的不寻常的行为丁二烯加氢的形成的AuZn nanoalloy

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摘要

The reaction of selective hydrogenation of butadiene performed in an excess of propene, which has been extensively studied over gold supported on different oxides and exhibited high selectivity to butenes, has been applied to the case of gold (1 wt%) supported on zinc oxide (8 m(2) g(-1)), a strongly basic oxide, in order to try to thwart deactivation. Our results revealed, for the first time, a catalytic behaviour drastically different from what was previously observed over gold catalysts supported on alumina or titania, i.e. a much poorer activity when the catalyst was activated under usual conditions under hydrogen but a "normal" activity when it was activated in air. An in-depth characterisation study based on different hypotheses to explain the unusual result revealed that at variance with the other catalysts, Au1Zn1 alloy particles formed during activation under hydrogen at 300 degrees C and were responsible for the loss of activity.
机译：选择性加氢的反应丁二烯进行过度的丙烯,已被广泛地研究过了黄金支持不同的氧化物和表现出高丁烯的选择性,已被应用到的黄金(1 wt %)支持氧化锌(8m (2) g(1)),强碱性氧化物,以试图阻止失活。第一次,催化行为大大不同于以前观察到在黄金支持氧化铝催化剂或二氧化钛,即当穷得多的活动催化剂在通常条件下被激活在氢时而是一个“正常”的活动在空气中被激活。描述研究基于不同假设来解释不同寻常的结果显示在方差与其他催化剂,Au1Zn1合金颗粒在激活期间形成的氢在300摄氏度和负责任的损失的活动。

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