766.    ---------------.  [ECKELL, J.]  [Relations Between Structure of Catalyst and Chemical Change.  II.]  Ztschr. Elektrochem., vol. 39, 1933, pp. 433-439; Chem. Abs., vol. 27, 1933, p. 4996.

     Effect of cold working on the catalytic activity of Ni foil used in the hydrogenation of C2H4 was studied.  After the foil was rolled to a thickness of 0.1 mm., the strip was divided into 2 sections; 1 section was tested for catalytic activity without further treatment while the other was recrystallized by heating for 5 hr. in a high vacuum at 900.  The recrystallized strip was always inactive.  The untreated strip decreased in activity after the 1st run.  The recrystallized strip after being polished became as active as the untreated cold-rolled strip.  The catalytic action was independent of the size of the surface area but depended on the structure.  The activity of the Ni is attributed to deformation of the space lattice of the surface crystals by cold rolling or polishing.