| http://www.w3.org/ns/prov#value | - The hydrogenation catalysts usable in the hydrogen-modification include, for example, metals belonging to groups VI and VIII of the Periodic Table or their compounds, such as nickel, chromium, paradium, platinum, cobalt, osmium, rhenium, ruthenium, a Raney nickel catalyst, nickel sulfide, nickel oxide, copper chromite, cobalt-molybdenum, molybdenum oxide, molybdenum sulfide, platinum oxide, cobalt
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