Abstract
NiO-ZrO2/SO 4 -2 catalysts were prepared by coprecipitation from the solution of nickel chloride -zirconium oxychloride mixture followed by treating with H2SO4 NiO-ZrO2 alone without SO 4 -2 was inactive as a catalyst for ethylene dimerization, but NiO-ZrO2/SO 4 -2 was found to be very active even at room temperature. The high catalytic activity of NiO-ZrO2/SO 4 -2 was closely correlated with the increase of acid strength by the inductive effect of sulfate ion adsorbed on NiO-ZrO2. The decrease of catalytic activity above 150‡C of evacuation temperature was explained in terms of the structural change of catalyst from amorphous phase to crystalline, and the sintering.
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