Thesis (M.Sc.)--Chulalongkorn University, 2004

In this work, cobalt complexes supported on 5% crosslink poly(styrene-co-divinylbenzene-co-vinylbenzyl chloride) Schiff base, non Schiff base bidentate and tridentate ligands, in which N and O are donor atom, were prepared. These polystyrene supported cobalt complexes were characterized by FT-IR, XRF, AAS and TGA techniques and used as catalyst for cyclooctene hydrogenation. The influence of various parameters such as temperature, hydrogen pressure, amount of catalyst, amount of substrate, reaction time, types of solvent, type of cobalt compounds and ligand types, were studied. It was found that all prepared catalysts were efficient, giving high yield of cyclooctane (>69%) at 60 degree ceilsuis, 9 atm in 3 h. The polystyrene supported catalysts have high thermal stability and can be reused successfully with only slight loss of activity and little leaching of metal from the polystyrene support.