prov:value
| - Suitable metals are selected from Group VIIIA of the Periodic Table, including the noble metals platinum, palladium, iridium, osmium, rhodium and ruthenium and non-noble metals such as iron, cobalt and nickel and also from Groups VA, VIA, VIIA, IB, IIB and IVB including vanadium, molybdenum, tungsten, silver, gold and rhenium.
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