| http://www.w3.org/ns/prov#value | - Such catalyst may furthermore comprise additional catalytically active substances such as further metal oxides, ???e.g. titania, vanadia, chromia, manganese, iron, cobalt, nickel, copper oxides, and/or noble metals, e.g. platinum, palladium, rhodium, ruthenium, rhenium, iridium, all of them alone or in admixture with one or more thereof, or alloys thereof.
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