title: Synthesis and catalytic properties of nanoparticulate intermetallic Ga-Pd compounds.
abstract: A two-step synthesis for the preparation of single-phase and nanoparticulate GaPd and GaPd(2) by coreduction of ionic metal-precursors with LiHBEt(3) in THF without additional stabilizers is described. The coreduction leads initially to the formation of Pd nanoparticles followed by a Pd-mediated reduction of Ga(3+) on their surfaces, requiring an additional annealing step. The majority of the intermetallic particles have diameters of 3 and 7 nm for GaPd and GaPd(2), 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 α-Al(2)O(3).
authors.affiliation: Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Strasse 40, 01187 Dresden, Germany. Marc.Armbruester@cpfs.mpg.de
authors.forename: Marc
authors.initials: M
authors.lastname: Armbrüster
authors.forename: Gregor
authors.initials: G
authors.lastname: Wowsnick
authors.forename: Matthias
authors.initials: M
authors.lastname: Friedrich
authors.forename: Marc
authors.initials: M
authors.lastname: Heggen
authors.forename: Raul
authors.initials: R
authors.lastname: Cardoso-Gil