Research Institute of Petroleum Industry (RIPI) Journal of Petroleum Science and Technology 2251-659X 4 1 2014 03 10 IN SITU SILICA SUPPORTED METALLOCENE CATALYSTS FOR ETHYLENE POLYMERIZATION 21 29 331 10.22078/jpst.2014.331 EN Saeid Ahmadjo Iran Polymer and Petrochemical Institute Hassan Arabi Iran Polymer and Petrochemical Institute Gholam Hossein Zohuri Ferdowsi University of Mashhad Gholam Reza Nejabat Iran Polymer and Petrochemical Institute Mojtaba Omidvar Iran Polymer and Petrochemical Institute Mostafa Ahmadi Iran Polymer and Petrochemical Institute Mohamad Mehdi Mortazavi Iran Polymer and Petrochemical Institute Journal Article 2013 05 17 <span style="font-family: Calibri; font-size: medium;">Bis(2-R-ind)ZrCl₂ (R: H or phenyl) was supported on different types of silica by in situ impregnation method and used for ethylene polymerization. In this method, the step of catalyst loading on support was eliminated and common alkyl aluminum (triisobutylaluminum, TiBA) cocatalyst was used instead of expensive methyl aluminiumoxane (MAO) cocatalyst in the polymerization. The effect of surface area of silica on the performance of the supported catalysts using three different types of silica including EP12 (390 m²/gr.), PQ3060 (570 m²/gr.) and MCM-41 (1100 m²/gr.) was investigated. The surface area had a more critical role relative to other characteristics of the support in the performance of catalysts. By using MCM-41 as support, the kinetic stability was enhanced. The activity of the supported catalysts was increased by increasing the surface area of silica in the order of MCM-41 > PQ3060 > EP12. The morphology of polymer particles was improved and reactor fouling was eliminated by supporting the catalyst.</span> https://jpst.ripi.ir/article_331_6da37dd3139aa4d9aa55b8d237ec5d4a.pdf