Surface-modified calcium carbonate as carrier for transition metal-based catalysts
AssigneeOmya International AG
InventorsPatrick A.C. Gane, Samuel Rentsch, Matthias Welker
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Abstract
The present invention relates to a catalyst system comprising a transition metal compound on a solid carrier which is a surface-reacted calcium carbonate. The invention further relates to a method for manufacturing said catalyst system and to its use in heterogeneous catalysis.
Claims23
A catalyst system comprising a transition metal compound on a solid carrier, wherein the solid carrier is a surface-reacted calcium carbonate comprising ground natural calcium carbonate (GNCC) or precipitated calcium carbonate (PCC), and at least one water-insoluble calcium salt other than calcium carbonate, and wherein the surface-reacted calcium carbonate shows:
- (i) a specific surface area of from 15 to 200 m2/g measured using nitrogen and the BET method according to ISO 9277:2010;
- (ii) an intra-particle intruded specific pore volume in the range of from 0.1 to
3 cm3/g calculated from mercury porosimetry measurement;
- and
- (iii) a ratio of the at least one water-insoluble calcium salt to calcite, aragonite and/or vaterite in the range of from 1:99 to 99:1 by weight.
A method for manufacturing a catalyst system comprising a transition metal compound on a solid carrier, the method comprising the following steps:
- (a) providing at least one surface-reacted calcium carbonate comprising ground natural calcium carbonate (GNCC) or precipitated calcium carbonate (PCC), and at least one water-insoluble calcium salt other than calcium carbonate;
- (b) providing at least one transition metal compound;
- and
- (c) contacting in a liquid medium, the surface-reacted calcium carbonate provided in step (a) and the transition metal compound provided in step (b) to obtain a mixture comprising surface-reacted calcium carbonate and a transition metal compound;
- wherein the surface-reacted calcium carbonate shows:
- (i) a specific surface area of from 15 to 200 m2/g measured using nitrogen and the BET method according to ISO 9277:2010;
- (ii) an intra-particle intruded specific pore volume in the range of from 0.1 to 2.3 cm3/g calculated from mercury porosimetry measurement;
- and
- (iii) a ratio of the at least one water-insoluble calcium salt to calcite, aragonite and/or vaterite in the range of from 1:99 to 99:1 by weight.
Dependencies are inferred from the claim text.