25904-15-8Relevant articles and documents
Ligand effect in the Rh-NP catalysed partial hydrogenation of substituted arenes
Castelbou, Jessica Llop,Gual, Aitor,Mercade, Elisabet,Claver, Carmen,Godard, Cyril
, p. 2828 - 2833 (2013/09/24)
The Rh nanoparticles Rh1-Rh4 stabilised by the mono- and bidentate phosphine and phosphite ligands I-IV were synthesised, characterised and applied as catalysts in the partial hydrogenation of substituted arenes. In the case of disubstituted arenes, selectivities for the corresponding cyclohexene derivatives of up to 39% were achieved at ca. 40% conversion. The effect of parameters such as temperature and pressure was also examined. In the hydrogenation of styrene, very high selectivities for ethylbenzene were achieved with TOF values up to ca. 23500 h-1. All these results show that the catalytic performance of small Rh-NPs can be modulated by the appropriate choice of stabilising agents.
Stabilized rhodium(0) nanoparticles: A reusable hydrogenation catalyst for arene derivatives in a biphasic water-liquid system
Schulz, Juergen,Roucoux, Alain,Patin, Henri
, p. 618 - 624 (2007/10/03)
A colloidal system based on an aqueous suspension of rhodium(0) nanoparticles proved to be an efficient catalyst for the hydrogenation of arene derivatives under biphasic conditions. The rhodium nanoparticles (2 - 2.5 nm) were synthesized by the reduction of RhCl3·3 H2O with sodium borohydride and were stabilized by highly water-soluble N-alkyl-N-(2- hydroxyethyl)ammonium salts (HEA-C(n)). These surfactant molecules were characterized by measurements of the surface tension and the aqueous dispersions with rhodium were observed by transmission electron cryomicroscopy. The catalytic system is efficient under ultramild conditions, namely room temperature and 1 atm H2 pressure. The aqueous phase which contains the protected rhodium(0) colloids can be reused without significant loss of activity. The microheterogeneous behavior of this catalytic system was confirmed on a mercury poisoning experiment.
