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- W2013119443 abstract "The active sites of chromic oxide polymerization catalysts form by interaction of the catalyst surface with monomer. Part of the Cr6+ atoms are reduced to the trivalent state and alkylated. The active sites are alkylated trivalent chromium atoms in combination with a Lewis acid. By lowering the electron density on the Cr3+ atom, the Lewis acid strengthens the Cr3+C bond in the polymer chain and increases the ability of the Cr3+ atoms to coordinate with the monomer molecules. On the other hand, coordination weakens the Cr3+C bond, which grows stronger again after the monomer molecule enters the chain. Polymerization occurs as a result of alternative strengthening and weakening of this bond. An effective carrier increases the oxidative power of the chromic anhydride and enhances the donor-acceptor properties of the chromium atoms. There is a direct dependence between the oxidative power of chromic oxide catalysts and the polyethylene yield on them, which persists up to a certain limit. The subsequent drop in activity is due to decreasing stability of the catalyst." @default.
- W2013119443 created "2016-06-24" @default.
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- W2013119443 date "1971-09-01" @default.
- W2013119443 modified "2023-10-11" @default.
- W2013119443 title "Nature of active sites of supported chromic oxide polymerization catalysts" @default.
- W2013119443 cites W2062254661 @default.
- W2013119443 doi "https://doi.org/10.1016/0021-9517(71)90205-3" @default.
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