Study of energy distribution of active sites in heterogeneous Ziegler-Natta catalysts View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1997-07

AUTHORS

Lyudmila A. Novokshonova, Natalia Yu. Kovaleva, Yurii A. Gavrilov, Vadim G. Krasheninnikov, Ilia O. Leipunskii, Alexey N. Zhigach, Michail N. Larichev, Michail V. Chebunin

ABSTRACT

New method of investigation of active sites non-uniformity was developed. The method is based on mass-spectrometric study of temperature programmed desorption (TPD) products from the catalyst surface at initial stages of olefin gasphase polymerization. The conditions of polymerization allowed to obtain the short macrochains on catalyst surface. Two well-resolved intense maxima in the temperature ranges of 180–210°C and 280–320°C on the TPD curves from SiO2/TiCl4/AlEt2Cl catalyst surface after polymerization were observed in a result of thermal destruction of active Ti-C bonds and the evolution of hydrocarbon molecules of different length (up to 14 monomer units in chain). One may conclude that in this catalyst there are at least two types of active sites varying in the activation energy of thermal destruction of Ti-C bonds. The distribution of active sites over activation energy of Ti-C bond thermal destruction was calculated. More... »

PAGES

59-65

References to SciGraph publications

  • 1988. Newer Aspects of Active Centre Determination in Ziegler-Natta Polymerization using 14CO Radio-Tagging in TRANSITION METALS AND ORGANOMETALLICS AS CATALYSTS FOR OLEFIN POLYMERIZATION
  • 1974. Structures of copolymers of high olefins in FORTSCHRITTE DER HOCHPOLYMEREN-FORSCHUNG
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/s002890050120

    DOI

    http://dx.doi.org/10.1007/s002890050120

    DIMENSIONS

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