[Zurück]

J. Roeser, M. Kronstein, M. Litschauer, A. Thomas, M.-A. Néouze:
"Ionic Nanoparticle Networks as solid state catalysts";
European Journal of Inorganic Chemistry, 2012 (2012), 32; S. 5305 - 5311.

We report the catalytic activity for the cycloaddition of CO₂ to organic cyclic carbonates of recently developed ionic nanoparticle networks (INN). The combination of high imidazolium content, able to coordinate to CO₂ molecules, within the 3-D network makes the hybrid materials INN highly promising heterogeneous catalyst for CO₂ activation reactions.
The catalytic activity of INN powders and gels were investigated with various starting epoxides. Quantitative conversion was reached with epichlorohydrin. The influence of mono- or bis-imidazolium bridging ligands, methylation of the C2 position in the aromatic ring of the organic cation could be evidenced by evaluation of the activity with the less reactive propylene oxide as starting epoxide. Finally the influence of the type of inorganic nanoparticle support was also studied by preparing heterobimetallic silica-zinc oxide nanoparticle networks. Promising results were obtained with various epoxides. Conversion or selectivity up to 100% could be obtained.
The catalyst could be reused, owing to the good thermal stability of the hybrid inorganic-organic INN. After four reaction runs the catalyst proved to still be active.

hybrid material / metal oxide nanoparticles / imidazolium / CO2 cycloaddition / catalysis

http://dx.doi.org/10.1002/ejic.201200581

Projektleitung Marie-Alexandra Néouze:
Ionische Verknüpfung von Nanopartikeln