3400.     ---------------.  [THOREN, F.]  [Activity and Temperature Relationships for Nickel Catalysts.  II.]  Ztschr. anorg. Chem., vol. 165, 1927, pp. 171-191; Chem. Abs., vol. 21, 1927, p. 3804.

        Previously reported experiments on the hydration of C₂H₄, C₆H₆, and O₂ using the static method, indicated a stepwise increase in activity of Ni catalysts with increase in temperature.  Further experiments on the hydration of C₂H₄, using the dynamic method and a single catalyst, confirmed the earlier results.  The average temperatures at which the irregular increases in activity occurred, appeared to be -18°, 10°, 41°, 61°, 81°, 100°, 120°, 139°, and 163°.  The results were not reproducible with different samples of the same catalyst.