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• Ngamposri, S
• Praserthdam, P
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• Ngamposri, S
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Molecules 2005, 10(6), 672-678; doi:10.3390/10060672

Article

Catalytic Activity During Copolymerization of Ethylene and 1-Hexene via Mixed TiO2/SiO2-Supported MAO with rac-Et[Ind]2ZrCl2 Metallocene Catalyst

B. Jongsomjit* , S. Ngamposri and P. Praserthdam

Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Thailand

* Author to whom correspondence should be addressed.

Received: 7 October 2004 / Accepted: 16 November 2004 / Published: 14 July 2005

(This article belongs to the Special Issue Synthesis and Chemistry of Chiral Metallocenes)

Download PDF Full-Text [62 KB, uploaded 20 June 2008 16:49 CEST]

Abstract: Activities during ethylene/1-hexene copolymerization were found to increaseusing the mixed titania/silica-supported MAO with rac-Et[Ind]₂ZrCl₂ metallocenecatalyst. Energy Dispersive X-ray spectorcopy (EDX) indicated that the titania wasapparently located on the outer surface of silica and acted as a spacer to anchor MAO tothe silica surface. IR spectra revealed the Si-O-Ti stretching at 980 cm^_-1 with low contentof titania. The presence of anchored titania resulted in less steric hindrance and lessinteraction due to supporting effect.

Keywords: Metallocene catalyst; titania; silica; supports; copolymerization

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