Two MgCl₂-supported Ziegler–Natta catalysts were prepared by loading TiCl₄ onto activated δ-MgCl₂ supports, which contained 0.1 wt% (Cat-1) and 1.0 wt% (Cat-2) of titanium (Ti), respectively. Cat-1 has a slightly larger specific surface area (88.1 m²/g) and nearly the same pore volume (0.45 cm³/g) as the δ-MgCl₂ support, but the catalyst with 1.0% Ti (Cat-2) has smaller specific surface area (66.3 m²/g) and pore volume (0.40 cm³/g). The kinetics and active center distribution of ethylene polymerization with the catalysts were compared. Cat-1 showed much higher activity per gram of titanium than Cat-2, which can be attributed mainly to the much higher [C^∗]/[Ti] value of Cat-1 (60%) than of Cat-2 (12%). In both polymerization systems, the [C^∗]/[Ti] value increased with time, but the Cat-2 system showed a much larger [C^∗]/[Ti] increase than the Cat-1 system. Active center distribution of the catalysts disclosed by deconvolution of the molecular weight distribution into multiple Flory components was evidently different in the initial stage (0–200 s). The Cat-1 system produced more polymer with low molecular weight than the Cat-2 system, and the Flory components of low molecular weight decayed faster than those with high molecular weight. Influence of Ti content on number and structure of active centers formed on clustered Ti species is discussed with reconsideration of the current models of catalyst structure.

两个的MgCl ₂ -支持通过加载的TiCl制备齐格勒-纳塔催化剂₄上激活δ-的MgCl ₂载体，其含有0.1重量％（CAT-1）和1.0％（重量）的钛（猫-2）（Ti）的，分别。CAT-1具有稍微较大的比表面积（88.1米² / g）和几乎相同的孔体积（0.45厘米³ / g）作为将δ的MgCl ₂的支持，但与催化剂1.0％的Ti（CAT-2）具有较小的比表面积（66.3 m ² / g）和孔体积（0.40 cm ³/G）。比较了乙烯与催化剂聚合的动力学和活性中心分布。Cat-1的每克钛活度比Cat-2高得多，这主要归因于Cat-1（60％）的Cat [C ^∗ ] / [Ti]值比Cat-2（12％）高得多）。在两种聚合体系中，[C ^∗ ] / [Ti]值均随时间增加，但Cat-2体系显示出更大的[C ^∗]] / [Ti]比Cat-1系统增加。在初始阶段（0-200 s），通过将分子量分布解卷积成多种Flory组分而揭示的催化剂的活性中心分布明显不同。与Cat-2系统相比，Cat-1系统可生产出更多的低分子量聚合物，而低分子量的Flory组分的降解速度要快于高分子量的聚合物。结合当前催化剂结构模型，讨论了Ti含量对簇状Ti物种上形成的活性中心的数量和结构的影响。