Abstract
The original palladium colloidal suspensions with an average size of 2.7nm have been synthesised by reducing Na2PdCl4 with sodium borohydride and were stabilized by water soluble N,N-dimethyl-N-cetyl-N-(2-hydroxyethyl)ammonium chloride salt. The catalytic hydrogenation and dehalogenation of various halogenoarenes have been investigated with this aqueous suspension of palladium nanoparticles and compared with the well-known rhodium suspension. The influences of the halogen fragment and the experimental conditions have also been studied. It was observed that the kinetics and selectivity of the competitive dehalogenation/hydrogenation depend on the nature of metal colloids and the hydrogen pressure.
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