Design of Core-Pd/Shell-Ag Nanocomposite Catalyst for Selective Semihydrogenation of Alkynes
Design of Core-Pd/Shell-Ag Nanocomposite Catalyst for Selective Semihydrogenation of Alkynes
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DOI：
10.1021/acscatal.5b02518
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发表时间：
2016-02-01
期刊：
影响因子：
12.9
通讯作者：
Kaneda, Kiyotomi
中科院分区：
文献类型：
--
作者：
Mitsudome, Takato;Urayama, Teppei;Kaneda, Kiyotomi
我们设计了核-钯/壳-银纳米复合催化剂(Pd@Ag)，用于烯烃的高选择性半加氢。核壳纳米复合材料的构建使低活性的银纳米粒子对炔烃的选择半氢化反应有了显著的改善，因为氢是以协同的方式从核-钯纳米粒子提供给壳-银纳米粒子的。同时，将壳层银纳米粒子包覆在核钯纳米粒子上，可以有效地抑制钯纳米粒子对烯烃的过度加氢反应。核心-钯和壳-银的这种互补作用在温和的反应条件下(室温和1atm H-2)对多种具有高Z-选择性的烯烃提供了高的化学选择性。此外，Pd@Ag可以很容易地从反应混合物中分离出来，并且可以重复使用，而不会损失催化活性或选择性。
We designed core-Pd/shell-Ag nanocomposite catalyst (Pd@Ag) for highly selective semihydrogenation of alkynes. The construction of the core-shell nanocomposite enables a significant improvement in the low activity of Ag NPs for the selective semihydrogenation of alkynes because hydrogen is supplied from the core-Pd NPs to the shell-Ag NPs in a synergistic manner. Simultaneously, coating the core-Pd NPs with shell-Ag NPs results in efficient suppression of overhydrogenation of alkenes by the Pd NPs. This complementary action of core-Pd and shell-Ag provides high chemoselectivity toward a wide range of alkenes with high Z-selectivity under mild reaction conditions (room temperature and 1 atm H-2). Moreover, Pd@Ag can be easily separated from the reaction mixture and is reusable without loss of catalytic activity or selectivity.