Synthesis and Catalytic Properties of Nanoparticulate Intermetallic Ga-Pd Compounds
Synthesis and Catalytic Properties of Nanoparticulate Intermetallic Ga-Pd Compounds
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DOI：
10.1021/ja202869d
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发表时间：
2011-06-15
影响因子：
15
通讯作者：
Cardoso-Gil, Raul
中科院分区：
文献类型：
--
作者：
Armbruester, Marc;Wowsnick, Gregor;Cardoso-Gil, Raul
描述了离子金属前驱体与LiHBEt3在THF中共还原制备单相和纳米粒GaPd和GaPd2的两步合成方法，无需额外的稳定剂。共还原首先导致钯纳米颗粒的形成，然后是钯介导的表面Ga3+的还原，这需要额外的退火步骤。对于GaPd和GaPd2，大多数金属间颗粒的直径分别为3 nm和7 nm，并且通过圆盘离心机测量确定了意想不到的窄尺寸分布。通过XRD， TEM和化学分析对纳米颗粒进行了表征，以确保金属间化合物的形成。在乙炔半加氢反应中，无负载纳米颗粒具有较高的催化活性，同时又保持了基体材料优异的选择性。在α - al2o3表面沉积可进一步提高活性。
A two-step synthesis for the preparation of single-phase and nanoparticulate GaPd and GaPd2 by coreduction of ionic metal-precursors with LiHBEt3 in THF without additional stabilizers is described. The coreduction leads initially to the formation of Pd nanop articles followed by a Pd-mediated reduction of Ga3+ on their surfaces, requiring an additional annealing step. The majority of the intermetallic particles have diameters of 3 and 7 nm for GaPd and GaPd2, respectively, and unexpected narrow size distributions as determined by disk centrifuge measurements. The nanoparticles have been characterized by XRD, TEM, and chemical analysis to ensure the formation of the intermetallic compounds. Unsupported nanoparticles possess high catalytic activity while maintaining the excellent selectivity of the ground bulk materials in the semihydrogenation of acetylene. The activity could be further increased by depositing the particles on alpha-Al2O3.