Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 46: Poster: Wetting, Nano- and Microfluidics
CPP 46.5: Poster
Mittwoch, 9. März 2016, 18:15–21:00, Poster B2
Silica stabilized Pickering-emulsions for hydroformylation — •Judith Witte1, Dmitrij Stehl1, Regine von Klitzing1, Tobias Pogrzeba1, Marcel Schmidt1, Reinhard Schomäker1, Lena Hohl2, Matthias Kraume2, Tina Skale3, and Anja Drews3 — 1TU-Berlin, Straße des 17. Juni 124, 10623 Berlin — 2TU-Berlin, Frauenhoferstr. 33-36, 10587 Berlin — 3HTW Berlin, Wilhelminenhofstr. 75 A, 12459 Berlin
Pickering-emulsions (PEs) are particle stabilized emulsions. PEs can be used for catalytic reactions, for example for the hydroformylation of long chained olefins in a water in oil (w/o-) emulsion. In this study, the water droplets (water phase) which are surrounded by SiO2-nanoparticles as stabilizer, contain [HRh(CO)(TPPTS)3] as homogeneous catalyst. The particle-stabilized water droplets are emulsified in 1-Dodecene (oil phase). After the hydroformylation, the water droplets with the expensive catalyst can be easily separated from the product by membrane filtration and used again for the next reactions. This is a huge advantage in comparison to surfactant stabilized emulsions, which often break during filtration processes. Preliminary experiments showed that an increase in the amount of SiO2-nanoparticles leads to an increase of the product yield (Tridecanal) and decreases the droplet size from 0.02 to 0.005 mm. An addition of surfactant (Triton X-100) at low concentrations (<cmc) increases the product yield as well.