Abstract
A series of catalysts, NiSO 4/SiO 2, for ethylene dimerization was prepared by the impregnation method using an aqueous solution of nickel sulfate. No diffraction line of nickel sulfate was observed up to 20 wt%, indicating good dispersion of nickel sulfate on the surface of SiO 2 and SiO 2–Al 2O 3. The addition of Al 2O 3 to NiSO 4/SiO 2 improved the thermal stability of catalyst and increased the number of acid sites on the surface of catalyst. Consequently, the Al 2O 3-promoted catalyst exhibited remarkably higher catalytic activity than non-promoted NiSO 4/SiO 2. The catalytic activities of supported NiSO 4 catalysts were correlated with the acidity of catalysts measured by the ammonia chemisorption method, regardless of the kind of support (SiO 2 or SiO 2–Al 2O 3).
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