Working surface science model for the Phillips ethylene polymerization catalyst: preparation and testing

P.C. Thüne; C.P.J. Verhagen; M.J.G. van den Boer; J.W. Niemantsverdriet

doi:10.1021/jp971753j

Working surface science model for the Phillips ethylene polymerization catalyst: preparation and testing

P.C. Thüne, C.P.J. Verhagen, M.J.G. van den Boer, J.W. Niemantsverdriet (Corresponding author)

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Abstract

A surface science model for the Phillips ethylene polymerization catalyst has been prepared, by impregnating aqueous CrO₃ on a flat silicium (100) substrate covered by amorphous silica. Impregnating in a spin-coating technique offers control over the chromium loading, which was varied between 0.4 and 4.0 Cr/nm². After impregnation chromium is dispersed molecularly at loadings smaller than 2 Cr/nm². Upon calcination chromium is anchored to the support over Cr - O - Si ester bonds, although a fraction is lost from the surface due to volatilization, as could be established with X-ray photoelectron spectroscopy. The model catalyst polymerizes ethylene at 160 °C and atmospheric pressure after being activated in 80/20 He/O₂ at 650 °C, confirming its validity as a model for the industrial catalyst.

Original language	English
Pages (from-to)	8559-8563
Number of pages	5
Journal	Journal of Physical Chemistry B
Volume	101
Issue number	42
DOIs	https://doi.org/10.1021/jp971753j
Publication status	Published - 16 Oct 1997

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abstract = "A surface science model for the Phillips ethylene polymerization catalyst has been prepared, by impregnating aqueous CrO3 on a flat silicium (100) substrate covered by amorphous silica. Impregnating in a spin-coating technique offers control over the chromium loading, which was varied between 0.4 and 4.0 Cr/nm2. After impregnation chromium is dispersed molecularly at loadings smaller than 2 Cr/nm2. Upon calcination chromium is anchored to the support over Cr - O - Si ester bonds, although a fraction is lost from the surface due to volatilization, as could be established with X-ray photoelectron spectroscopy. The model catalyst polymerizes ethylene at 160 °C and atmospheric pressure after being activated in 80/20 He/O2 at 650 °C, confirming its validity as a model for the industrial catalyst.",

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AU - van den Boer, M.J.G.

AU - Niemantsverdriet, J.W.

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Working surface science model for the Phillips ethylene polymerization catalyst: preparation and testing

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