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Return to Abstracts of Literature 1750-1999

Literature Abstracts

  1773.    KIPERMAN, S., AND TEMKIN, M.  [Kinetics of Ammonia Synthesis on Molybdenum Catalyst.]  Acta Physicochem. U.R.S.S. vol. 11, 1946, pp. 267-282; Jour. Phys. Chem. (U.S.S.R.), vol. 20, 1946, pp. 369-378; Chem. Abs., vol. 40, 1946, p. 6950.

         Experimental data confirm the work of Temkin and Pyzhev on the synthesis of NH₃ on promoted Fe catalyst and extend the results to a Mo catalyst.  A flow system was used with 2 cc. of catalyst.  The Mo catalyst was prepared by reducing ammonium molybdate in NH₃ for 20 hr. at 600°-650°.  X-ray diffraction patterns indicate that the catalysts operate in the form of metallic Fe and Mo₂N.  The data for both catalysts support the kinetic equation suggested by Temkin and Pyzhev, the value of a for both catalysts is 0.5.  The apparent activation energy of NH₃ decomposition on Mo catalyst as calculated from the synthesis rate is 42.5 kcal. per mol.  The NH₃ synthesis on Fe and Mo is considered to have the same mechanism.