Role of dispersion state of ti species in deactivation of MgCl2-supported Ziegler-Natta catalysts
| Autor: | Shougo Takahashi, Iku Kouzai, Toshiaki Taniike, Toru Wada, Minoru Terano |
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| Rok vydání: | 2010 |
| Předmět: |
inorganic chemicals
Materials science Polymers and Plastics General Chemical Engineering Nanochemistry macromolecular substances Natta Photochemistry Polymer engineering Catalysis chemistry.chemical_compound Oxidation state Polymer chemistry Materials Chemistry supported Ziegler biology Organic Chemistry technology industry and agriculture Natta catalysts biology.organism_classification Monomer chemistry Polymerization deactivation Dispersion (chemistry) MgCl2 role of dispersion state of Ti species |
| Zdroj: | Macromolecular Research. 18:839-844 |
| ISSN: | 2092-7673 1598-5032 |
| DOI: | 10.1007/s13233-010-0914-1 |
| Popis: | The deactivation behaviors of TiCl3/MgCl2 model catalysts with molecularly dispersed TiCl3 were investigated to clarify the role of the dispersion state of the Ti species in the deactivation of MgCl2-supported Ziegler-Natta (ZN) catalysts for propylene and ethylene polymerization. The propylene and ethylene polymerization activities of clustered Ti species supported on MgCl2 were approximately one tenth of those of isolated Ti species, which is indicative of the significance of the aggregation of Ti species in the deactivation of ZN catalysts for olefin polymerization. Moreover, the time-course depression of monomer consumption for the clustered Ti species was slower than that for the isolated Ti species in propylene polymerization, whereas the dispersion state barely affected the depression rate in ethylene polymerization. The reduction rate of the Ti species was concluded to be important for the time-course depression of propylene consumption, whereas ethylene polymerization was insensitive to the oxidation state of the Ti species. |
| Databáze: | OpenAIRE |
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