Nanosized Metal Particles by Control of the Metal Dispersion During Sol-Gel Processing

1994 ◽  
Vol 351 ◽  
Author(s):  
Ulric Schubert ◽  
Claus Görsmann ◽  
Stefan Tewinkel ◽  
Andreas Kaiser ◽  
Thomas Heinrich
Keyword(s):  
Metal Complexes ◽  
Sol Gel ◽  
Metal Particles ◽  
Metal Dispersion ◽  
Bimetallic Particles ◽  
Highly Dispersed ◽  
Gel Processing

ABSTRACTThe previously developed method to prepare highly dispersed metals in SiO2 by sol-gel processing of metal complexes containing alkoxysilyl-substituted ligands was extended to the preparation (i) of bimetallic particles in SiO2 and (ii) of highly dispersed metals in TiO2.

Metal Complexes in Oxidic Matrices

1992 ◽  
Vol 271 ◽  
Author(s):  
Ulrich Schubert ◽  
Boris Breitscheidel ◽  
Hermann Buhler ◽  
Christian Egger ◽  
Wlodzimierz Urbaniak
Keyword(s):  
Metal Complex ◽  
Metal Complexes ◽  
Sol Gel ◽  
Ceramic Matrix ◽  
Metal Particles ◽  
Homogeneous Catalysts ◽  
Organic Group ◽  
Catalytically Active ◽  
Group A ◽  
Gel Processing

ABSTRACTAlkoxides of the type (RO)nE-X-A in which a functional organic group A is connected to the alkoxide moiety via an inert and hydrolytically stable spacer X, are used to bind metal complex moieties. Sol-gel processing of the resulting metal complexes [(RO)nE-X-A]yMIm under standard conditions results in the formation of metal complex containing gels. If the metal complex moiety MLm is catalytically active, this method results in the heterogenization of homogeneous catalysts. Another application of the metal complex substituted gels is the preparation of composites containing uniform, nanometer-sized metal particles homogeneously dispersed in a ceramic matrix.

Highly dispersed nickel and palladium nanoparticle silica aerogels: sol–gel processing of tethered metal complexes and application as catalysts in the Mizoroki–Heck reaction

2006 ◽  
Vol 30 (7) ◽  
pp. 1093-1097 ◽  
Author(s):  
Sandra Martínez ◽  
Marcial Moreno-Mañas ◽  
Adelina Vallribera ◽  
Ulrich Schubert ◽  
Anna Roig ◽  
...  
Keyword(s):  
Metal Complexes ◽  
Heck Reaction ◽  
Sol Gel ◽  
Silica Aerogels ◽  
Palladium Nanoparticle ◽  
Highly Dispersed ◽  
Gel Processing

scholarly journals Metallkomplexe in Anorganischen Matrices, 5 [1] / Metal Complexes in Inorganic Matrices, 5 [1]

1991 ◽  
Vol 46 (6) ◽  
pp. 783-788 ◽  
Author(s):  
Christian Egger ◽  
Ulrich Schubert
Keyword(s):  
Acetic Acid ◽  
Metal Complexes ◽  
Phenylacetic Acid ◽  
Sol Gel ◽  
Rhodium Complex ◽  
Gel Processing ◽  
Inorganic Matrices

A heterogenized rhodium complex, prepared by sol-gel processing of Rh(CO)Cl[PPh2CH2CH2Si(OEt)3]2 and Si(OEt)4, is shown to catalyze the conversion of the silanes H4-nSiPh„ (n = 1 - 3) or (HMe2Si)2O to (poly)siloxanes by air or water. Using THF as a solvent, the silanoles Ph3SiOH or Ph2Si(OH)2 are obtained instead. The reaction of phenylacetic acid or acetic acid with HSiPh3 to give silyl esters is catalyzed by the same compound.

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