Catalysts comprising metals or metal oxides or hydroxides, not provided for in group [CPC: B01J21/00] of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups [CPC: B01J23/02] - [CPC: B01J23/36] with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium