| 초록 |
A series of catalysts, NiO/Al2O3-TiO2/WO3, for ethylene dimerization was prepared by the precipitation and impregnation methods. For NiO/Al2O3-TiO2/WO3, no diffraction line of nickel oxide was observed up to 30 wt%, indicating good dispersion of nickel oxide on the surface of catalyst. The addition of Al2O3 increased the surface area of catalyst, while the addition of WO3 increased the acidity. The catalyst without NiO or WO3 was inactive for ethylene dimerization. 20-NiO/7-Al2O3-TiO2/WO3 containing 20 wt% NiO, 20 wt% WO3 and 7 mol% Al2O3, and calcined at 400 °C exhibited a maximum catalytic activity due to the effect of Al2O3 promoting and WO3 modifying. |
