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- W1661162010 abstract "A model Phillips catalyst for ethylene polymerization has been prepared by spin coating of a Cr(III) precursor (Cr(acac)(3)) on a flat silicon wafer (100) covered by amorphous silica. The spin coating parameters were chosen in order to obtain a homogeneous film. The model catalyst was submitted to an activation 2 process. The surface concentration of Cr decreased from about 0.8 to 0.4 Cr atom/nm(2) as the temperature increased from 150 to 550degreesC. Direct information concerning the surface molecular species and the environment of Cr was provided by ToF-SIMS and XPS. At 350degreesC, the catalyst precursor was decomposed; Cr species were in the form oxide and surface-anchored chromates. Upon final activation at 650degreesC for 6 h, Cr species were below the XPS detection limit; however the model catalyst was active for ethylene polymerization at 160degreesC and 2 bar pressure." @default.
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- W1661162010 date "2000-01-01" @default.
- W1661162010 modified "2023-10-03" @default.
- W1661162010 title "Elaboration and characterization of a model Phillips catalyst for ethylene polymerization" @default.
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- W1661162010 doi "https://doi.org/10.1016/s0167-2991(00)80726-0" @default.
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