Solvent-Free, Low-Temperature, Selective Hydrogenation of Polyenes using a Bimetallic Nanoparticle Ru–Sn Catalyst

On Metal Segregation of Bimetallic Nanocatalysts Prepared by a One-Pot Method in Microemulsions

“…However, for the couples Pt-Cu, Pt-Bi, Cu-Ni, and Pt-Co, alloys were always obtained, in spite of the high difference in reduction rate. It could be understood on the basis of the very high flexibility of the microemulsion film (see experiments 25,27,28). However, even using a rigid film (experiments 24,26,29,32) no experimental evidence of a segregated structure was obtained.…”

“…A more flexible surfactant film allows a faster material exchange [101] and, as a result, the difference between reduction rates is minimized, giving rise to a higher degree of mix [72]. This outcome can be clearly established from Table 1, by focusing our attention on nanoparticles prepared using a very flexible film, such as in a water/CTAB/isooctane/n-butanol microemulsion (see experiments number 15,25,28). All particles are obtained as nanoalloys, in spite of the high differences in reduction potentials (Fe-Ni [74], ∆ε 0 = 0.20 V; Pt-Cu [96], ∆ε 0 = 0.40 V; Cu-Ni [76], ∆ε 0 = 0.58 V).…”

Iridium–Bismuth Cluster Complexes Yield Bimetallic Nano-Catalysts for the Direct Oxidation of 3-Picoline to Niacin

“…1,2 Tailoring suitable oxophiles in combination with multimetallic clusters has afforded intrinsic compositional control at the nanoscale, with the added advantage of controlling the morphology, size and shape of the ensuing nakedmetal nanoparticles. [3][4][5] Such a design approach could be integrated with bespoke support modifications (e.g.…”

“…3,5 Furthermore, the capping of the CO ligands on the nano-cluster precursor, improve the degree of site-isolation, leading to the creation of the catalytically active nanoparticle catalyst. It has been previously demonstrated [1][2][3][4][5] that the subsequent removal of the CO ligands, generates uniform (< 5 nm), well-defined, anchored bimetallic nanoparticles, where the bismuth plays a pivotal role in securing the nanoclusters to the support and ensuring its compositional integrity. [3][4][5] Furthermore, it has also been demonstrated that bismuth plays a key role in enhancing the catalytic efficiency in a range of selective oxidation reactions.…”

Electrospinning of Metal Doped Alumina Nanofibers for Catalyst Applications

“…The individual nanoparticles are dispersed throughout the entire fiber and firmly anchored to the walls of the pores of the alumina support; hence their tendency to sinter and coalesce is minimized. In addition, there is free diffusional access of reactants and exit of products from the nanocatalyst, thereby facilitating the catalytic turnover of bulky organic molecules such as unburnt hydrocarbons Raja et al, 2001;. Nanomaterials are more effective than the monolithic support structures for two reasons.…”