Moderately cross-linked co-polymers of N,N-dimethylacrylamide (DMAA), 2-(methylthio)ethyl methacrylate (MTEMA)and N,N′-methylenebisacrylamide proves to be effective macromolecular ligands able to extract, PdII and AuIII from water solutions and to thoroughly disperse them inside the relevant polymer frameworks. Chemical reduction with NaBH4 in water leads to M0/resin composites, in which size-control of the generated metal nanoclusters is achieved. Catalysts Au0/MTEMA-DMAA are active in the rapid oxidation of n-butanal to n-butanoic acid by dioxygen under mild conditions in water. Catalysts M0/MTEMA-DMAA and M 0/C (M = Au, Pd) are active and moderalely chemoselective in the oxidation of n-butanol to n-butanal under the same conditions. Activity and chemoselectivity are positively affected by the co-presence of the two metal centres and for M0 = Au and reach the best level when the very hydrophilic resin poly-(4-vinylpyridine-acrylic acid-N,N′- methylenebisacrylamide) (VAM) is employed.
|Titolo:||Generation of size-controlled palladium(0) and gold(0) nanoclusters inside the nanoporous domains of gel-type functional resins: Part II: Prospects for oxidation catalysis in the liquid phase|
PRATI, LAURA (Penultimo)
|Parole Chiave:||Au0 nanoclusters; Functional resins; Oxidation catalysis; Pd0|
|Settore Scientifico Disciplinare:||Settore CHIM/03 - Chimica Generale e Inorganica|
|Data di pubblicazione:||2005|
|Digital Object Identifier (DOI):||10.1016/j.molcata.2005.04.062|
|Appare nelle tipologie:||01 - Articolo su periodico|