Catalyst
AssigneeJohnson Matthey Public Limited Company
InventorsAlec Gordon Gunner, Timothy Ian Hyde, Robert John Potter, David Thompsett
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Abstract
A novel catalyst comprising a Pt--M alloy wherein M is one or more metals selected from the transition metal elements or from Groups IIIA or IVA of the Periodic Table in "Handbook of Chemistry and Physics" 64th Edition, CRC Press, and Y wherein Y is a bronze forming element or an oxide thereof, characterised in that the Pt--M alloy is in intimate contact with Y, and provided that M is not Ru if Y is WO.sub.3 is disclosed and which may be used as a poison tolerant catalyst for use in fuel cells, specifically as the anode of a PEM fuel cell.
Claims34
A catalyst comprising platinum, a component M, and a component Y, wherein:
- the platinum and component M form a Pt--M alloy, and the Pt--M alloy and component Y are in intimate contact;
- M is one or more metals selected from the group consisting of Transition Metals, Group IIIA metals, and Group IVA metals;
- and
- Y is selected from the group consisting of Mo, W and oxides thereof, provided that when Y is WO.sub.3, then M is other than Ru.
A catalyst comprising a Pt--Ru alloy, which is further alloyed with tungsten.
A catalyst comprising a Pt--Ru alloy, which is in intimate contact with a component Y wherein Y is selected from the group consisting of molybdenum and molybdenum oxide.
A catalyst comprising a Pt--Ru alloy and a second metal M, which is further alloyed with tungsten.
A catalyst comprising a Pt--Ru alloy and a second metal M, which is in intimate contact with a component Y wherein Y is selected from the group consisting of bronze forming elements and oxides thereof, other than tungsten and tungsten oxide.
A catalyst comprising platinum, a component M, and a component Y, wherein:
- the platinum and component M form a Pt--M alloy, and the Pt--M alloy and component Y are in intimate contact;
- M is two or more metals selected from the group consisting of Transition Metals, Group IIIA metals, and Group IVA metals and wherein one of said metals is ruthenium;
- and Y is selected from the group consisting of bronze forming elements and oxides thereof provided that when Y is WO.sub.3, then M is other than ruthenium.
Dependencies are inferred from the claim text.