Hydrogen Helium Argon Neon Xenon Krypton Rare Gases ² Food to hydrogenate liquid oils (such as soybean, fish, cottonseed and corn), converting them to semisolid materials such as shortenings, margarine and peanut butter. ² Chemical processing primarily to manufacture ammonia and methanol, but also to hydrogenate non-edible oils for soaps, insulation, plastics, ointments and other specialty ...