chapter  15
18 Pages

Hydrosilylation on Hydrophobic Material-Supported Platinum Catalysts

Abstract ................................................................................................. 224 15.1 Introduction ................................................................................ 224 15.2 Materials and Methods ............................................................... 225 15.3 Results and Discussion .............................................................. 227 15.2 Platinum Species on Catalyst Surfaces ...................................... 235 15.4 Conclusions ................................................................................ 238 Keywords .............................................................................................. 239 References ............................................................................................. 239

ABSTRACT

Catalytic activity of platinum supported on styrene-divinylbenzene copolymer and fluorinated carbons was tested in reactions of hydrosilylation of several olefins and the way of platinum binding to the support surface as well as platinum oxidation states were determined. Catalysts based on the above hydrophobic materials make it possible to obtain high yields of desirable reaction products and in most cases the highest activity was shown by polymer-supported platinum catalyst. In addition to hydrophobicity, another factor appeared to influence catalytic activity, namely the kind of the catalyst precursor. It was established that some amount of unpolymerized vinyl groups that were present on the polymeric support surface was involved in the interaction with platinum. X-ray photoelectron spectroscopic (XPS) spectra enabled to determine that platinum was present on the catalyst surface in 0 and +2 oxidation states, however, Pt0 clearly predominated.