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      581.  ------.  [DU PONT DE NEMOURS, E. I., & Co.]  Catalytic Production of Formic Acid.  British Patent 406,344. Feb. 26. 1934.  Chem. Abs., vol. 28. 1934. p. 4746.

            Catalysts for the production of HCOOH from Co and steam comprise the halides (preferably iodides) of a large number of metals.  The halides may be made by adding a hydrohalogen acid to the gases and using an oxide, hydroxide, carbonate, or acetate.  Carriers may be used.  Gives examples.