Catalyst supports and uses thereof
AssigneesOxford University Innovation Limited, SCG Chemicals Public Company Limited
InventorsDermot O'HARE, Jean-Charles BUFFET, Zoe R. TURNER, Philip KENYON
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Abstract
Catalyst supports prepared from Ni2+-containing layered double hydroxides are disclosed. together with processes by which they are made and catalyst compositions comprising them. When used in the polymerisation of an olefin. the catalyst supports give control over the molecular weight distribution of the resulting polyolefin.
Claims25
A process for preparing a catalyst support, the process comprising the steps of:
- a) providing a layered double hydroxide, the layered double hydroxide comprising Ni2+;
- b) thermally treating the layered double hydroxide to a temperature of 100-600° C.;
- and
- c) contacting the thermally treated layered double hydroxide with an organoaluminium compound.
The process of any one of the preceding claims, wherein Al3+ accounts for all trivalent and tetravalent metal cations present within the layered double hydroxide provided in step a).
The process of any one of the preceding claims, wherein one or more inorganic oxyanion accounts for all anions present within the layered double hydroxide provided in step a).
The process of any one of the preceding claims, wherein step b) comprises thermally treating the layered double hydroxide provided in step a) to a temperature of 150-450° C.
The process of any one of the preceding claims, wherein step c) comprises contacting the thermally treated layered double hydroxide with 10-70 wt % of the organoaluminium compound relative to the mass of the thermally treated layered double hydroxide, wherein the organoaluminium compound is an alkyl aluminoxane.
A process for preparing a catalyst composition, the process comprising the steps of:
- a) providing a layered double hydroxide, the layered double hydroxide comprising Ni2+;
- b) thermally treating the layered double hydroxide to a temperature of 100-600° C.;
- c) contacting the thermally treated layered double hydroxide with an organoaluminium compound;
- and
- d) supporting an olefin polymerisation catalyst on the thermally treated layered double hydroxide;
- wherein step d) is performed before, concurrent with, or after step c).
Dependencies are inferred from the claim text.