Polymer anchored palladium(II)-diaminopropane complexes: synthesis and catalytic behaviour

Styrene-divinylbenzene copolymer with 5% and 15% cross linked were synthesi sed by suspension polymerization, chloromethylated and treated with 1,2-dia minopropane for the introduction of the ligand. The polymer beads modified with ligand was kept in contact with PdCl2 to form the metal complex on the surface of the polymer. The catalysts thus prepared were characterized by various techniques such as FTIR, reflectance UV-vis spectroscopy, SEM, EPR, TGA and ESCA. Physico-chemical properties such as moisture content, bulk d ensity, surface area by BET method and swelling with different solvents wer e studied. The catalytic activity of synthesised catalysts was tested for h ydrogenation of cyclohexene as a model reaction. Kinetic studies were carri ed out by varying different parameters. Energy of activation as well as ent ropy of activation was calculated. The recycling efficiency of the catalyst s was also studied. A probable reaction mechanism was proposed. (C) 1999 El sevier Science B.V. All rights reserved.