Abstract
Abstract Both magnetic susceptibility and oxygen chemisorption measurements on chromium oxide supported on silica-alumina catalyst show a limited evolution of the dispersion state of the chromium oxide during the time of the activation treatment in air at 550 °C. The Cr(III) domains tend to be more isotropic, and the reverse is true for the Cr(VI) domains. However, the activity for ethylene polymerization is only slightly stabilized by a longer activation time.
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