prov:value
| - Catalysts or catalyst precursors useful in the methods of the present invention include, but are not limited to, metals such as ruthenium, osmium, rhodium, iridium, palladium, platinum or a mixture thereof, as well as metal oxides, metal halides, metal carbides, metal nitrides, metal phosphides and metal sulfides of other transition metals including but not limited to Ti, V, Cr, Mn, Fe, Co, Ni, Cu
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