3944.  -----[WILLIAMS, R.] (Lazote, Inc.). Purifying Hydrogen; Ammonia Synthesis; Hydrogenation of Oils. British Patent 258,887, Sept. 24, 1925. Chem Abs., vol. 21, 1927, p. 3109.

CO is removed from H₂-containing gases by passage under pressure over a catalyst such as Zn, Zn and Cr, and Zn and Cu (or Fe, if the formation of some CH₄ is not detrimental) capable of forming oxygenated organic compounds such as MeOH, which are then removed the gas by condensation while the gas is till under pressure. The pressure used is preferably that under which purified gas is to be used. Residual CO can be removed from the gas by use of a CH₄-forming catalyst. Oily products and higher alcohols are produced when the gas speed is reduced, the temperature increased or alkali oxides are added to the catalyst. A mixture of H₂ and N₂ may be passed under a pressure of 900 atm. over heated ZnO or a mixture of Zn and Cr oxides and then passed to an NH₃-forming catalyst, formed from Fe₃O₄ containing 2% Al₂O₃ by fusing, cooling, crushing, and screening.