Catalyst
AssigneeJohnson Matthey Fuel Cells Limited
InventorsAlejandro Martinez Bonastre, Geoffrey Hugh Spikes, Rachel Louise O'Malley
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Abstract
A process for preparing a catalyst material, said catalyst material comprising a support material, a first metal and one or more second metals, wherein the first metal and the second metal(s) are alloyed and wherein the first metal is a platinum group metal and the second metal(s) is selected from the group of transition metals and tin provided the second metal(s) is different to the first metal is disclosed. The process comprises depositing a silicon oxide before or after deposition of the second metal(s), alloying the first and second metals and subsequently removing silicon oxide. A catalyst material prepared by this process is also disclosed.
Claims15
A process for preparing a catalyst material, said catalyst material comprising a support material, wherein the support material is fibrous or particulate, a first metal and one or more second metals, wherein the first metal and the second metal(s) are alloyed and wherein the first metal is a platinum group metal and the second metal(s) is selected from the group consisting of transition metals and tin, provided the second metal(s) is different to the first metal, said process comprising the steps:
- providing a catalyst material precursor comprising the first metal supported on the support material;
- (ii) depositing a silicon oxide precursor and one or more second metal precursors on the catalyst material precursor;
- (iii) carrying out a first heat treatment step to convert the silicon oxide precursor to silicon oxide;
- (iv) carrying out a second heat treatment step to alloy the first metal and the second metal(s);
- and
- (v) removal of at least some of the silicon oxide to give the catalyst material.
Dependencies are inferred from the claim text.