| http://www.w3.org/ns/prov#value | - The catalyst material 18 is typically chosen from the noble metals, such as platinum, palladium, and rhodium (either alone or as alloys or combinations), and oxides thereof, but may also be selected from chromium, nickel, rhenium, ruthenium, silver, osmium, iridium, vanadium, gold, binary oxides of palladium and rate earth metals/oxides (such as Sm4PdO7, Nd4PdO7, Pr4PdO7 and/or La4 PdO7), certain
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