| http://www.w3.org/ns/prov#value | - oving lead, nickel, and vanadium from petroleum refinery feed stocks; and in modifying, or ???reforming,??? crude petroleum fractions to increase their octane rating.Olefins that are free of such impurities as carbon monoxide, sulfur, halogen, and compounds of arsenic or lead (catalyst poisons), can be hydrogenated (i.e., combined with hydrogen) at atmospheric pressure and room temperature, using
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