Abstract
Novel SiO2‐supported Cr–V bimetallic oxides catalysts, which were capable of one‐pot synthesizing polyethylene with bimodal molecular weight distribution, had been successfully developed. These catalysts were prepared with a simple introduction of vanadium oxide onto the traditional Phillips CrOx/SiO2 catalyst. The polymerization activity over the Cr–V bimetallic catalysts was significantly improved compared with the V‐free Phillips CrOx/SiO2 catalyst. Moreover, the bimodal ethylene/1‐hexene copolymer prepared by the novel catalyst showed a better short chain branch distribution with more 1‐hexene comonomer inserted into the PE chains with high molecular weight, which would be favorable for the long term mechanical properties of the bimodal PE as potential high grade pipe materials.
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