Department of Chemistry, Tsinghua University, Beijing 100084, PR China.
Chemistry. 2012 Feb 27;18(9):2639-45. doi: 10.1002/chem.201102903. Epub 2012 Jan 26.
Palladium is a key catalyst invaluable to many industrial processes and fine-chemical synthesis. Although recent progress has allowed the synthesis of Pd nanoparticles with various shapes by using different techniques, the facile synthesis of Pd nanocrystals and turning them into a highly active, selective, and stable catalyst systems still remain challenging. Herein, we report the highly selective one-pot synthesis of monodisperse Pd cluster nanowires in aqueous solution; these consist of interconnected nanoparticles and may serve as highly active catalysts because of the enrichment of high index facets on the surface, including {443}, {331}, and {221} steps. For the first time, carbon nanotube and γ-Al(2)O(3) immobilized Pd cluster nanowires showed highly enhanced catalytic performance in the liquid-phase selective hydrogenation of cinnamaldehyde and gas-phase hydrogenation of 1,3butadiene relative to immobilized Pd icosahedra and nanocubes, as well as commercial Pd catalysts.
钯是许多工业过程和精细化学品合成中不可或缺的关键催化剂。尽管最近的进展允许使用不同的技术合成各种形状的钯纳米粒子，但仍然难以实现钯纳米晶的简便合成，并将其转化为高活性、选择性和稳定的催化剂体系。在此，我们报告了在水溶液中高选择性地一锅法合成单分散钯团簇纳米线；这些纳米线由相互连接的纳米颗粒组成，由于表面上高指数晶面的富集，包括{443}、{331}和{221}台阶，可能作为高活性催化剂。首次发现，碳纳米管和γ-Al(2)O(3)固载钯团簇纳米线在肉桂醛的液相选择性加氢和 1,3-丁二烯的气相加氢反应中表现出比固载的钯二十面体和纳米立方体以及商业 Pd 催化剂更高的催化性能。
