To optimize different kind of novel zeolites, mesoporous silicas and metal organic frameworks in order to maximize the selectivity, activity and stability for ethylene dimerization/oligomerization reactions. In addition, to investigate different transition metals (e.g. Zr, Ti, Ni) and ligands to control chain propagation. Finally, to study different impurities (e.g. Oxygen, CO2) and its effect on the catalyst performance.