Metallocene heterogeneization on acid supports

BELELLI, PATRICIA GABRIELA; EBERHARDT, ANDREA MARIEL; FERREIRA, MARÍA LUJÁN; DOS SANTOS, JOAO; DANIEL EDUARDO, DAMIANI

Recent Research Developments in Polymer Science

Año: 2004; p. 223 - 245

We studied a ZSM-5 zeolite as metallocene support for ethylene polymerization. We transformed the Na-ZSM-5 to H-ZSM-5. After the cation exchange, the zeolite was calcinated at three different temperatures. The characterization of the material indicates that by means of the calcination procedure it is possible to produce dealuminization with an increase of extra framework aluminum (EFAL). We prepared zirconocene-supported catalysts onto zeolitic supports using two preparation´s methods. The higher activity was found with the zirconocene supported on ZSM-5 pre-treated at 900 °C.We think that the dealuminization process generates an increase of EFAL. This EFAL is responsible for the higher activity.