Al_2O_3-Promoted Highly Active Catalyst,NiSO_4/Al_2O_3-TiO_2 for Ethylene Dimerization

摘要

A considerable number of papers have dealt with the problem of nickel-containing catalysts for ethylene dimerization.It has been reported that the dimerization activities of such catalysts are related to the acidic properties of the surface and low-valent nickel ions.Previously,it has been shown that nickel sulfate supported on TiO_2 is active for ethylene dimerization.However,a major disadvantage associated with TiO_2 support is its low specific surface area and low thermal stability of the anatase structure at high temperatures.To overcome these deficiencies,titania was combined with A1_2O_3,by taking advantage of the high thermal stability and high surface area of A1_2O_3.In this paper we report a new catalyst for ethylene dimerization,NiSO_4/Al_2O_3-TiO_2 prepared by promoting TiO_2 with Al_2O_3 and supporting NiSO_4 to improve catalytic activity and thermal stability.