An FTIR spectroscopic view of the initiation of ethylene polymerization on Cr/SiO2 catalyst
| Autor: | P. A. Zielinski, I. G. Dalla Lana |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
Ethylene
Inorganic chemistry technology industry and agriculture macromolecular substances Polyethylene Photochemistry Chemical reaction Catalysis Dissociation (chemistry) chemistry.chemical_compound Adsorption chemistry Polymerization Physical and Theoretical Chemistry Fourier transform infrared spectroscopy |
| Zdroj: | Journal of Catalysis. 137:368-376 |
| ISSN: | 0021-9517 |
| Popis: | The onset of polymerization of ethylene on Cr/SiO 2 catalyst activated by high-temperature treatment was studied at room temperature using fast-scanning FTIR spectral measurements. Initial rapid adsorption of molecular ethylene on the pre-activated catalyst preceded the onset of polymerization. A time-delay between adsorption and polymerization was observed. The experimental evidence suggests that initiation of polymerization follows dissociation of ethylene, presumably on two Cr sites. Propagation and other mechanistic steps then follow as suggested earlier. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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