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Reduced anatase on silica as a support for a Ziegler catalyst by Jose Luis de Souza; Fabio Fabri; Regina Buffon; Ulf Schuchardt is a Materials Science article available to read on EtoBox.

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Reduced anatase TiO 2 is used as an alternative support for TiCl 4 , leading to good results in the polymerization of ethylene and propylene with isotacticity above 80%. However, due to the low concentration of active sites, approximately 1 wt% of active titanium, the system leads to low productivity. With the objective of increasing the amount of active sites and the productivity, a catalytic system with a high surface area was developed. The synthesis consists in the chemical vapor deposition, known as Atomic Layer Epitaxy (ALE), of TiCl 4 onto a silica surface. The deposited titanium is then transformed into anatase by heating between 300 and 500 8C. The synthesis of the catalyst is carried out by chemical reduction of the oxide with n-butyl lithium and heterogenization of TiCl 4 . The amount of supported TiO 2 was, on average, 13 mg TiO 2 (g SiO 2 ) À1 . The content of active titanium was 23 mmol Ti(III) (g cat) À1 . Two resonance peaks for Ti(III) (g = 1.98 and g = 1.96) in the EPR spectrum suggest the presence of two different active species on the catalyst surface. The catalyst was tested in the polymerization of ethylene in the liquid and in the gas phase, leading to produc

Who reads Reduced anatase on silica as a support for a Ziegler catalyst?

Author

Jose Luis de Souza; Fabio Fabri; Regina Buffon; Ulf Schuchardt

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0926-860X)

Published

2007

Language

EN

Field

Materials Science (Physical Sciences)