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| - The catalyst material 36 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, cerium, titanium, silver, osmium, iridium, vanadium, gold, binary oxides of palladium and rate earth metals, transition metals and/or oxides thereof, rare-ear
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