prov:value
| - In the embodiments where hydrogen is separated from methane or other light hydrocarbons or where olefins are separated from light hydrocarbons, M is preferably osmium, iridium, platinum, mercury, ruthenium, rhodium, palladium, tin, titanium, chromium, manganese, iron, cobalt, nickel, copper, or silver; more preferably M is ruthenium, rhodium, palladium, tin, titanium, chromium, manganese, iron, co
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