2757.     PSHENITSYN, N. N., SIDOROV, N. V., AND STERNINA, D. G.  [Ultrasonic Treatment of the Catalyst for Ammonia Synthesis.]  Jour. Appl. Chem. (U.S.S.R.), vol. 13, 1940, pp. 76-78 (in German, p. 78); Chem. Abs,. vol. 34, 1940, p. 8189.

        Treatment of the Fe₃O₄+3% Al₂O₃+1.5% K₂O catalyst with a sound of frequency 555 kilohertz did not increase its activity in NH₃ synthesis under a pressure of 300 atm.  Describes apparatus used for the treatment.

                    PUFF, H.  See abs. 1648a.