Solvated gold atoms in the preparation of efficient supported catalysts: Correlation between morphological features and catalytic activity in the hydrosilylation of 1-hexyne

Tuning the Activity and Selectivity of Phenylacetylene Hydrosilylation with Triethylsilane in the Liquid Phase over Size Controlled Pt Nanoparticles

“…In contrast with extensive efforts targeting high selectivities, the effect of metal particle size on hydrosilylation of acetylenes has rarely been reported in the literature [6,17], although the effect of particle size and morphology could have a pronounced effect of the outcome of the reaction.…”

“…Transition metal catalysts have been employed in hydrosylilation reactions, among which heterogeneous ones are gaining importance within the frames of green chemistry [3][4][5][6][7][8][9][10][11][12][13]. Supported Supported Pt [3][4][5][7][8][9]14], Pd [13], Pd alloys [15,16], and Au [6,10,12] particles have been shown to be efficient heterogeneous hydrosylilation catalysts leading mostly to the β-(E) product with high selectivity (Figure 1). In contrast with extensive efforts targeting high selectivities, the effect of metal particle size on hydrosilylation of acetylenes has rarely been reported in the literature [6,17], although the effect of particle size and morphology could have a pronounced effect of the outcome of the reaction.…”

CrO /SiO2 catalysts prepared by metal vapour synthesis: Physical–chemical characterisation and functional testing in oxidative dehydrogenation of propane

“…Catalysts (here/after Cr-SiO 2 -MVS) were prepared using metal vapour synthesis (MVS) [19][20][21][22][23][24][25][26]. According to that method chromium (800 mg) was sublimed by resistive heating in a alumina coated tungsten wire crucible.…”

“…The co-condensation at low temperature of metal vapour (commonly produced on lab scale by resistance heating and on larger scale by electron beam vaporization) with vapour of weakly stabilizing organic ligands (such as mesitylene, acetone or acetonitrile), using commercially available reactors [19], affords solvent-stabilized metal atoms (Solvated Metal Atoms, SMA) soluble in the excess of ligand [20,21]. Depending from the kind of the organic ligand SMA can affords well defined organo-metallic species [22] or solvent stabilized metal clusters suitable for the preparation of supported metal systems on a wide range of organic and inorganic materials [23][24][25][26]. Thus, this method appear as a good candidate for the attainment of a high dispersion of supported species even at quite high loading.…”

Water soluble heptakis(6-deoxy-6-thio)cyclomaltoheptaose capped gold nanoparticles via metal vapour synthesis: NMR structural characterization and complexation properties

“…c o m / l o c a t e / c a r r e s concentration or keeping temperature) which affect the metal clustering processes. [17][18][19] Remarkable potentialities of MVS in exerting a fine tuning of nanoparticles sizes prompted us to exploit MVS technique in the preparation of water soluble Au-NPs stabilized by heptakis(6-deoxy-6-thio)cyclomaltoheptaose ((Au) n /b-CDSH). The NMR DOSY (Diffusion-Ordered SpectroscopY) technique was employed as an effective, reliable and fast way to analyse the role of the total concentration of gold in SMA solutions as well as of the Au/b-CDSH molar ratio on nanoparticles sizes.…”