NiSO_4/γ-Al_2O_3催化剂是一种新型、高效的混合烯烃叠合催化剂,其反应活性随活性组分Ni担载量的增加,呈单峰曲线的变化规律.应用XRD相定量法、TEM法研究了一组担载量不同的NiSO_4/γ-Al_2O_3催化剂中活性组分NiSO_4的表面分散度,测定了表面单层最大分散量——阈值.与用密置单层模型计算所得阚值接近.用吸附指示剂法测定了一组NiSO_4/γ-Al_2O_3催化剂的表面酸性,发现其酸性为最大值时试样的组成与阈值接近. NiSO_4 / γ-Al_2O_3 catalyst is a novel and efficient mixed olefin catalyst, whose reactivity increases with the increase of the loading of active component Ni, showing a single peak curve.Using XRD quantitative method and TEM method A set of NiSO 4 / γ-Al 2 O 3 catalysts with different loadings was used to determine the surface dispersion of NiSO 4, and the maximum dispersion of the surface monolayer was determined, which was close to that calculated by the single layer model The surface acidity of a group of NiSO 4 / γ-Al 2 O 3 catalysts was determined by adsorption indicator method. The results show that the composition of the sample is close to the threshold when the acidity is the maximum.