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The Role of Porosity in Ethylene Polymerization on Cr/SiO2Catalysts

Elsevier Science & Technology
DOI: 10.1016/s0167-2991(08)64292-5


Abstract Examination of three silica-supported catalysts during the early stages of ethylene polymerization indicated a very strong influence of the physical form of the silica support upon the transient yield of polymer in a slurry reactor. Polymerization within pores is a dominant factor. Acceleration of the rate is continual up to high polymer yields per gram of catalyst if pore sizes facilitate particle fragmentation. The growing polymer encapsulates the catalyst fragments even though more rupturing occurs, suggesting insertion of ethylene into the polymer chain occurs at the catalyst surface.

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