200.    --------------. [BENTON, A. F., AND WHITE, T. A.] Sorption of Gases by Iron. Jour. Am. Chem. Soc., vol. 54, 1932, pp. 1820-1830; Chem. Abs., vol. 26, 1932, p. 3712.

                  Sorption of N₂, CO and H₂ was studied on reduced Fe at temperatures 195°-400°.  At the low temperatures sorption consists solely of physical adsorption.  Activated adsorption takes place at higher temperatures.  The rate of this process is greatest for CO and least for N₂.  With H₂ at 110° and above, a probable solution of the gas occurs.  A stepwise increase in the adsorption at low temperatures suggests the accumulation of definite layers of molecules.

                  BERG, A.  See abs. 1389.