prov:value
| - For instance, co-catalyst components including alkaline earth metals, such as calcium, magnesium, barium and the like, noble metals, such as platinum, palladium, iridium, ruthenium, gold and the like, iron, nickel, cobalt, cerium, manganese and other metals as well as various salts are first supported on a silica type or titania type support in a conventional manner and, then, rhodium metal is sup
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