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- W2041310080 abstract "Nitric oxide has been used as a probe molecule to investigate the state of chromium supported on silica gel which is active in the polymerization of ethylene. Chromium(III) ions, formed either by the reduction of Cr(VI) or by the direct addition of Cr(III) from solution, coordinate with nitric oxide as the [CrIII(NO)2]3+ complex. This complex has been identified by epr and infrared spectroscopy. The initial activity for ethylene polymerization correlates well with the concentration of isolated Cr(III) ions, as determined from the epr spectrum of the [CrIII(NO)2]3+ complex. This correlation persists over a variety of catalyst pretreatments, including oxidation and reduction of the chromium. Chromium(V) was excluded as the active site on the basis of a negative correlation with catalytic activity, and chromium(II) was excluded because reduction of Cr(III)SiO2 samples and extensive reduction of the Cr(VI)SiO2 samples with CO resulted in catalysts having very low activity. Mononuclear chromium(III) ions with at least two available coordination sites are identified as the active species for ethylene polymerization." @default.
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- W2041310080 date "1981-03-01" @default.
- W2041310080 modified "2023-10-11" @default.
- W2041310080 title "The active site for ethylene polymerization over chromium supported on silica" @default.
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- W2041310080 doi "https://doi.org/10.1016/0021-9517(81)90045-2" @default.
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