Polymer-Supported Cobalt Catalysts for Hydrogenation of Cyclooctene

Crosslinked beads of poly(styrene-co-divinylbenzene-co-vinylbenzyl chloride) with Schiff base and non Schiff base chelating ligands, aminopyridine in which N is a donor atom have been prepared. The ligand anchored polymer beads were reacted with cobalt chloride to form polymer-supported cobalt complexes which were characterized by Fourier transform infrared (FT-IR) spectroscopy and atomic absorption spectrometry (AAS). The thermogravimetric analysis (TGA) of the polymer-supported cobalt complexes reveals their thermal stability. Swelling behavior in different solvents was studied. The catalytic activity of the polymer-supported cobalt complexes was evaluated by studying the hydrogenation ofcyclooctene to cyclooctane. The influence ofvarious reaction parameters uch as temperature, hydrogen pressure, catalyst concentration, reaction time, type of solvent on the hydrogenation of cyclooctene was investigated. The polymer-supported cobalt catalysts containing Schiff base ligand showed higher activity than the non-Schiff base (76-80 and 7lV:o yield, respectively). The catalysts can be reused successfully with slight loss of activity and little leaching of metal from the support