Dependence of Reactivity of Propagation Centers of Oxide Catalysts for Ethylene Polymerization on Catalyst Composition and Activation Conditions Full article
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Symposium on Macromolecular Chemistry 25-30 Aug 1969 , Budapest |
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| Journal |
Journal of Polymer Science, Part A: Polymer Chemistry
ISSN: 0887-624X , E-ISSN: 1099-0518 |
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| Output data | Year: 1971, Volume: 9, Number: 3, Pages: 771-784 Pages count : 14 DOI: 10.1002/pol.1971.150090315 | ||
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Abstract:
The propagation rate constant Kp was used as a measure of reactivity of propagation centers in ethylene polymerization with oxide catalysts. This constant was determined by a radiotracer quenching technique for oxide catalysts of different compositions and activation conditions. For catalysts based on various transition metal oxides, an increase of Kp was observed in the series W < Mo < Cr and V < Cr. In the case of chromium oxide catalyst it was shown that Kp value does not depend on the content of the transition metal in a catalyst. A change of propagation center reactivity was found when oxides of different composition (SiO2, Al2O3, ZrO2, TiO2) were used as supports. An increase of the vacuum activation temperature of a catalyst results in increasing Kp. Pretreatment of catalyst with different reducing agents (SO2, CO2, NH3, HCN) results in the change of Kp value in comparison with the catalyst activated by the vacuum treatment only. The data obtained on the variation of the reactivity of the propagation centers permit one to draw a conclusion about the composition of surface compounds as active centers of the oxide polymerization catalysts.
Cite:
Ermakov Y.I.
, Zakharov V.A.
, Kushnareva E.G.
Dependence of Reactivity of Propagation Centers of Oxide Catalysts for Ethylene Polymerization on Catalyst Composition and Activation Conditions
Journal of Polymer Science, Part A: Polymer Chemistry. 1971. V.9. N3. P.771-784. DOI: 10.1002/pol.1971.150090315 WOS РИНЦ ANCAN OpenAlex
Dependence of Reactivity of Propagation Centers of Oxide Catalysts for Ethylene Polymerization on Catalyst Composition and Activation Conditions
Journal of Polymer Science, Part A: Polymer Chemistry. 1971. V.9. N3. P.771-784. DOI: 10.1002/pol.1971.150090315 WOS РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | Oct 2, 1969 |
| Accepted: | Dec 30, 1970 |
| Published print: | Mar 1, 1971 |
| Published online: | Mar 10, 2003 |
Identifiers:
| Web of science: | WOS:A1971J033400015 |
| Elibrary: | 29818458 |
| Chemical Abstracts: | 1971:406483 |
| Chemical Abstracts (print): | 75:6483 |
| OpenAlex: | W2164196901 |