Synthesis and Catalytic Properties of Nanoparticulate Intermetallic Ga鈥揚d Compounds

详细信息    查看全文

• 作者：Marc Armbr眉ster ; Gregor Wowsnick ; Matthias Friedrich ; Marc Heggen ; Raul Cardoso-Gil
• 刊名：Journal of the American Chemical Society
• 出版年：2011
• 出版时间：June 15, 2011
• 年：2011
• 卷：133
• 期：23
• 页码：9112-9118
• 全文大小：952K
• 年卷期：v.133,no.23(June 15, 2011)
• ISSN：1520-5126

文摘

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 nanoparticles 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 伪-Al₂O₃.