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Related Concept Videos

Heterogeneous Catalysis01:22

Heterogeneous Catalysis

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Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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Core-shell nanoreactors for efficient aqueous biphasic catalysis.

Xuewei Zhang1, Andrés F Cardozo, Si Chen

  • 1Université de Lyon, Univ. Lyon 1, CPE Lyon, CNRS, UMR 5265, C2P2 (Chemistry, Catalysis, Polymers & Processes), Team LCPP, Bat 308F, 43 Bd du 11 Novembre 1918, 69616 Villeurbanne (France).

Chemistry (Weinheim an Der Bergstrasse, Germany)
|October 7, 2014
PubMed
Summary
This summary is machine-generated.

Researchers developed water-borne phosphine-functionalized core-cross-linked micelles (CCM) for catalysis. These micelles efficiently catalyze reactions with low metal leaching, acting as effective nanoreactors.

Keywords:
biphasic catalysishydroformylationpolymerizationrhodiumself-assembly

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Area of Science:

  • Polymer Chemistry
  • Catalysis
  • Materials Science

Background:

  • Developing efficient and recyclable catalytic systems is crucial for sustainable chemistry.
  • Core-cross-linked micelles (CCM) offer unique nanoreactor properties for catalytic applications.
  • Controlling metal leaching in homogeneous catalysis remains a significant challenge.

Purpose of the Study:

  • To synthesize and characterize water-borne phosphine-functionalized CCM.
  • To evaluate the catalytic performance of CCM in aqueous biphasic hydroformylation.
  • To investigate the role of CCM as nanoreactors versus surfactants in catalysis.

Main Methods:

  • Reversible addition-fragmentation chain transfer (RAFT) polymerization for micelle synthesis.
  • Polymerization-induced self-assembly (PISA) for micelle formation.
  • Dynamic light scattering and NMR spectroscopy for characterization.
  • Catalysis of 1-octene hydroformylation using Rh-loaded CCM.

Main Results:

  • Stable, water-borne CCM with phosphine ligands were successfully synthesized.
  • CCM demonstrated high activity and recyclability in catalyzing 1-octene hydroformylation.
  • CCM exhibited significantly lower rhodium leaching compared to non-cross-linked micelles.
  • Evidence suggests CCM function as nanoreactors, facilitating substrate/product transport.

Conclusions:

  • Phosphine-functionalized CCM are effective nanoreactors for aqueous biphasic catalysis.
  • CCM provide a robust platform for immobilizing homogeneous catalysts, minimizing metal leaching.
  • The nanoreactor concept enhances catalyst stability and recyclability in hydroformylation reactions.