3399.     THOREN, F.  [Activity and Temperature Relationships for Nickel Catalysts.  I.]  Ztschr. anorg. Chem., vol. 163, 1927, pp. 367-395; Chem. Abs., vol. 21, 1927, p. 3804.

        Activities of Ni catalysts prepared in various ways were measured by a static method.  The reactions used were:  C2H4+H2→C2H6; C6H6+3H2→C6H12; O2+2H2→2H2O.  The activity of the catalysts increased stepwise with increase in temperature.  The mean values for the temperatures at which marked increase in activity was evidenced were 9.7, 40.1, 60.2, 80.7, 100.3, 119.4, 134.7, 170.0.  The actual % increase in activity at the various activation temperatures was not reproducible.  The activation temperatures were almost the same for all reactions and for different Ni catalysts.  The activation of the H2 is considered to be the cause of the phenomenon.