A series of novel V/Ti bimetallic polyethylene catalysts were developed successfully through the introduction of vanadium species into the (SiO₂/MgR₂/MgCl₂)·TiCl_x Ziegler-Natta Catalyst. The organometallic heterogeneous catalysts combined advantages of reducibility of magnesium alkyl on the activation of secondary metal active sites (vanadium active sites), which successfully enhanced average molecular weight in homopolymer products and produced dominantly bimodal molecular weight distribution in copolymer products. Catalyst preparation conditions including calcination temperature and magnesium dosage were investigated to explicit the effect on the relative performance of different metal active centers. Moreover, the factors including hydrogen and ethylene/1-hexene copolymerization were systematically studied. The bimetallic catalysts exhibit 63.9% enhancement on activity, 37.3% better hydrogen response than the original (SiO₂/MgR₂/MgCl₂)·TiCl_x organic magnesium Ziegler-Natta catalyst. Moreover, a simplified schematic model was proposed to elaborate on the reason why the bimetallic catalysts showed much higher activity than the original one, and each active species performance well. Vanadium active sites react quickly in the initial reaction time on the external surface of the support, which helps titanium active sites crack the catalyst particles together in the fragmentation and activation stage; then the released internal surface active sites, which were accessible to the monomer in the slurry phase, speed up the polymerization reaction during the latter reaction process.

通过将钒引入（SiO ₂ / MgR ₂ / MgCl ₂）·TiCl _x中，成功开发了一系列新颖的V / Ti双金属聚乙烯催化剂。齐格勒-纳塔催化剂。有机金属非均相催化剂结合了烷基镁在还原性金属活性位点（钒活性位点）活化方面的还原性优势，成功地提高了均聚物产物的平均分子量，并在共聚物产物中产生了主要的双峰分子量分布。研究了包括煅烧温度和镁用量在内的催化剂制备条件，以明确其对不同金属活性中心相对性能的影响。此外，系统地研究了包括氢和乙烯/ 1-己烯共聚在内的因素。双金属催化剂的活性提高了63.9％，氢响应比原始（SiO ₂ / MgR ₂ / MgCl₂）·TiCl _x有机镁齐格勒-纳塔催化剂。此外，提出了一种简化的示意图模型，以详细说明双金属催化剂显示出比原始催化剂高得多的活性，并且每种活性物质的性能都很好的原因。钒的活性位点在初始反应时间内在载体的外表面上迅速反应，这有助于钛的活性位点在断裂和活化阶段将催化剂颗粒裂解在一起。然后在淤浆相中单体可接近的释放的内部表面活性位点，在后面的反应过程中加速了聚合反应。