Oxidation catalysts
AssigneeFord Global Technologies, LLC
InventorsAlbert N. Chigapov, Brendan Patrick Carberry
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Abstract
The present invention relates to an oxidation catalyst comprising a substrate and an oxidation coating of platinum (Pt), palladium (Pd), cobalt (Co), iron (Fe) and cerium (Ce) applied to the substrate. Furthermore the invention relates to a method for producing such an oxidation catalyst and an internal combustion engine using such an oxidation catalyst.
Claims18
A catalyst having a substrate and a coating covering said substrate, wherein said coating comprises:
- platinum (Pt) and palladium (Pd);
- and
- active oxide components of cobalt (Co), iron (Fe) and cerium (Ce), wherein the amount of cerium (Ce) is between 2 weight percent (wt %) and 6.5 weight percent (wt %) of the total weight of the coating.
A method of producing an oxidation catalyst comprising the steps of:
- preparing a solution containing (i) platinum (Pt) tetra ammine salts, (ii) palladium (Pd) tetra ammine nitrate, (iii) nitrates of iron (Fe), cerium (Ce) and cobalt (Co), (iv) tartaric acid;
- impregnating a substrate with said solution to form a coating on the substrate, wherein the amount of cerium (Ce) is between 2 weight percent (wt %) and 6.5 weight percent (wt %) of the total weight of the coating;
- drying the impregnated support;
- and
- calcinating the impregnated support.
A catalyst having a substrate and a coating covering said substrate, wherein said coating comprises:
- platinum (Pt) and palladium (Pd);
- and
- active oxide components of cobalt (Co), iron (Fe) and cerium (Ce),
- wherein the amount of Pt and Pd is less than 5 wt % of the total coating and wherein the amount of cobalt (Co) is between 1.5 wt % and 2.5 wt % of the total coating, wherein the amount of cerium (Ce) is between 2 wt % and 6.5 wt % of the total weight of the coating.
Dependencies are inferred from the claim text.