863.   ---------------.  [FALCKE, V.]  [Reaction Between Ferrous Oxide and Carbon and Between Carbon Monoxide and Iron.  II.]  Ztschr. Elektrochem., vol. 21, 1915, pp. 37-50; Jour. Soc. Chem. Ind., vol. 34, 1915, p. 554; Chem. Abs., vol. 9, 1915, p. 1883.

     The author has studied these reactions at temperatures ranging from 600° upward, and has examined the gaseous products obtained when the reaction mixtures were dissolved in HCl.  3 varieties of graphite and 5 of amorphous C were used.  After thorough purification these were analyzed and their densities determined.  The apparatus was one used in previous work (abs. 862).  The solid mixtures were introduced in the form of compressed pellets.  Below 650° the highly purified varieties of C do not react with FeO, and above this temperature the several varieties of C do not behave alike and may be classed in 3 groups.  Sugar charcoal and that obtained by the action of CO and Na are quite inactive up to 800°.  C obtained by burning C₂H₂ in Cl and that from petroleum reacted with vigor at 650°.  It is not known whether the difference in behavior is a property of the different modifications or the result of catalytic action.  The graphites reacted vigorously also.  The products of the reaction of C and FeO contained pure Fe, and no hydrocarbons resulted from solution in HCl.  When Fe was permitted to absorb a large quantity of CO and the equilibrium pressure set up at 600°, the product of the reaction that took place yielded large amounts of saturated hydrocarbons, chiefly C₂H₆, when treated with HCl.  No solid C remained.  On the contrary, when Fe was heated in a stream of CO or allowed to absorb CO in large amounts, and then heated in a vacuum, the product treated with HCl gave no hydrocarbons and a residue of C resulted.