The effect of reaction parameters on catalytic activity in the polymerization of ethylene using supported and unsupported metallocene catalysts

• Published in: Applied catalysis. A, General Vol. 166; no. 1; pp. 207 - 213
• Main Authors: Quijada, Raúl, Rojas, René, Narvaez, Ana, Alzamora, Luis, Retuert, Jaime, Rabagliati, Franco M.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01-01-1998; Elsevier
• Subjects: Applied sciences; Catalyst; Ethylene; Exact sciences and technology; Metallocene; Organic polymers; Physicochemistry of polymers; Polymerization; Preparation, kinetics, thermodynamics, mechanism and catalysts; Silica support; Zirconium; Polymerization; Zirconium; Silica support; Metallocene; Catalyst; Ethylene; Polyethylene; Concentration effect; Olefin polymer; Chloro complex; Zirconium Organic compounds; Complex catalyst polymerization; Experimental study; Catalyst activity; Supported catalyst
• ISSN: 0926-860X; 1873-3875
• DOI: 10.1016/S0926-860X(97)00259-7

The catalytic activities of two metallocene compounds, EtInd
2ZrCl
2 and Ind
2ZrCl
2, in the polymerization of ethylene depend heavily on certain parameters, such as Zr concentration in the reaction, type of the reactor, and stirring speed for homogeneous catalysts. One way or another, all these factors influence the catalytic activity of these systems, but catalyst concentration and stirring speed are the most important ones. In the case of heterogeneous catalysts of the same metallocenes, the most pronounced influence is related to the type of support and its porous nature. The influence of the support on activity and morphology is shown.