Polymeric monolith supported Pt-nanoparticles as ligand-free catalysts for olefinhydrosilylation under batch and continuous conditions
- 3 November 2011
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Catalysis Science & Technology
- Vol. 2 (1), 220-226
- https://doi.org/10.1039/c1cy00351h
Abstract
Pt-nanoparticles were generated within the mesopores of polymeric monolithic supports. These monoliths were prepared viaring-opening metathesis polymerization (ROMP) from (Z)-9-oxabicyclo[6.1.0]non-4-ene (OBN) and tris(cyclooct-4-en-1-yloxy)methylsilane (CL) using the 3rd-generation Grubbs-initiator RuCl2(pyridine)2(IMesH2)(CHPh) (1) in the presence of a macro- and microporogen. To generate the Pt nanoparticles inside the porous system, the epoxy-groups of the monolithic supports were hydrolyzed into the corresponding vic-diol with the aid of 0.1 N sulfuric acid. Loading with Pt4+ and reduction with NaBH4 resulted in the formation of Pt nanoparticles vic-diols and the polymeric double bonds as evidenced by control experiments with poly(glycidylmethacrylate)-based monoliths that lack the double bonds. Typical metal loadings of around 1.7 mg g−1 (8.7 μmol g−1) were obtained. Pt(0)-loaded monoliths were used in the hydrosilylation of terminal alkenes, norborn-2-ene and norbornadiene applying both batch and continuous flow conditions. Hydrosilylation of olefins under continuous flow conditions resulted in constant product formation in 98% yield at T = 45 °C applying a linear flow of 12.0 mm min−1. Metal leaching was very low, resulting in Pt-contamination in the addition products of less than 4 ppm throughout.Keywords
This publication has 59 references indexed in Scilit:
- Carbon nanotubes decorated with Pt nanoparticles via electrostatic self-assembly: a highly active oxygen reduction electrocatalystJournal of Materials Chemistry, 2010
- Platinum Nanoparticles Supported on Ionic Liquid‐Modified Magnetic Nanoparticles: Selective Hydrogenation CatalystsAdvanced Synthesis & Catalysis, 2007
- Monolithic Media Prepared Via Electron Beam Curing for Proteins Separation and Flow-Through CatalysisMacromolecular Chemistry and Physics, 2007
- One-step preparation of poly(vinyl alcohol)-protected Pt nanoparticles through a heat-treatment methodMaterials Letters, 2007
- Tailored Ring-Opening Metathesis Polymerization Derived Monolithic Media Prepared from Cyclooctene-Based Monomers and Cross-LinkersMacromolecules, 2006
- Monolithic Disk‐Supported Metathesis Catalysts for Use in Combinatorial ChemistryAdvanced Synthesis & Catalysis, 2005
- Nanoparticulate Palladium Supported by Covalently Modified Silicas: Synthesis, Characterization, and Application as Catalysts for the Suzuki Coupling of Aryl HalidesChemistry of Materials, 2005
- Monolithische Materialien: neue Hochleistungsträger für permanent immobilisierte MetathesekatalysatorenAngewandte Chemie, 2001
- Pore Sizes of SolidsAngewandte Chemie-International Edition, 1978
- Olefin Coördination Compounds. III. Coördination Compounds of Butadiene with Platinum(II), Palladium(II) and Copper(I) Halides1Journal of the American Chemical Society, 1957