Nanostructured metals
Catalysis by Small Metal Clusters
New generation catalysts
Advanced Catalysts
Nanostructured metal catalysts
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Solvated Metal Atoms can be used as homogeneous catalytic precursors and as a source of active metal nanoparticles to produce supported and unsupported catalysts (Scheme). Metal Vapour when reacting with weakly stabilizing ligand (solvent) at low temperature gives the product of Solvated Metal Atoms containing metal microclusters stabilized by the solvent. |
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THE CATALYSTS CONTAIN VERY SMALL METAL PARTICLES (< 5 nm) UNIFORMELY DISTRIBUTED and ARE LARGELY MORE ACTIVE AND SELECTIVE THAN PRESENTLY AVAILABLE COMMERCIAL SAMPLES THE THIRTY-YEAR skilfulness and EXPERIENCE OF PISA GROUP, at THE ICCOM-CNr of pisa, ON METAL VAPOUR CHEMISTRY, aRE THE groundwork of the current production and application of these new generation catalysts
POWERFUL HOMOGENEOUS AND HETEROGENEOUS HOMO- AND HETERO NANOSTRUCTURED METAL CATALYSTS GENERATED USING METAL VAPOURS AS CHEMICAL REAGENTS |
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| Very active and selective New generation catalysts, Metal vapors technology technique,Bimetallic catalytic systems, Homogeneous Heterogeneous Oxidation Polymerization catalysts, Production of Hetero Nanostructured metals catalysts,Advanced nanostructured metal powders Catalysts by Small Metal Clusters,Hydrogenation catalysis |
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Palladium (0) Mesitylene in mesitylene solution (Stabilized by TOA) Pdn nanoparticles ranging 0.5 - 1 nm Active in Heck reactions Suitable for the deposition of active Pd nanoparticles, ranging 1 2 nm in diameter, on C or solid oxide supports
Fe(0) Cycloolefins in aliphatic solvents Active catalysts for the cyclotrimerization of alkynes and for hydroformylation reactions
Suitable
for the deposition of active Fe nanoparticles on solid supports and for the
preparation of magneto fluids
An example of the catalytic activity and selectivity of homogeneous catalysts: Idrosilylation of vinyl compounds with a Pt-mesitylene solution obtained via MVS technique.
In
analogous conditions a Pt Karstedt catalyst does not catalyse the reaction.
Metal catalysts presently available Homogeneous CatalystsCo (0) Toluene in toluene solution (Stabilized by 2-butyne) Con microclusters, (n ≤ 10) as evidenced by EPR Active in the cyclococyclization of alkynes and nitriles;it has been proved successful even in hydroformylation reaction. Suitable for the deposition of activated Co particles, ranging 2 3 nm in diameter, on C or solid oxide supports. J. Mol. Catal., 56 (1989) 133. Platinum (0) Mesitylene in mesitylene solution (Stabilized by vinylsiloxanes) Ptn nanoparticles ranging 0.5 - 1 nm, as evidenced by TOF-MS analysis Excellent catalyst for hydrosilylation reactions Excellent precursors for the deposition of Pt nanoparticles on C or solid oxide supports J. Organomet. Chem., 451 (1993) C4; J. Mol. Catal., 91 (1994) 83 metal Vapour when reacting with weakly stabilizing ligand (solvent) at low temperature gives the product of Solvated metal Atoms containing metal microclusters stabilized by the solvent. Au (0) Acetone in acetone solution Aun microclusters (n<10) stabilized by acetone; as shown by TOF-MS analyses Active catalysts in oxygenation reactions with molecular oxygen 9Th FECS Conference, Bordeaux (F), 2004 29 August 1 September, Abstract p.353 Solvated metal Atoms can be used as homogeneous catalytic precursors and as a source of active metal nanoparticles to produce supported and unsupported catalysts (Scheme). Rhodium Mesitylene in mesitylene solution Rhodium THF in THF solution (Stabilized by trioctylamine (TOA)) Rhn nanoclusters ranging 0.5 1 nm in diameter Active in hydrogenation, hydroformylation and hydrosilylation reactions Excellent precursors for the deposition of activated Rh particles,ranging 1 2 nm in diameter, on C or solid oxide supports. |