Homomolecular isotope exchange of hydrogen on nickel - chromia catalystand on nickel films

Zhavoronkova, K N; Perevezentseva, N N

Title: Homomolecular isotope exchange of hydrogen on nickel - chromia catalystand on nickel films

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Abstract

The specific catalytic activity (K/sub sp/) of commercial Ni/Cr/sub 2/O/sub 3/ catalyst and of nickel films has been investigated in the reaction of isotope exchange in molecular hydrogen at temperatures of 77-293/sup 0/K and a pressure of 0.5mm Hg. For the nickel films, a break was observed in the Arrhenius plot at 130/sup 0/K; the values of the activation energy E for the low-temperature and high-temperature regions were 0 and 6 kJ/mole, respectively. For the Ni/Cr/sub 2/O/sub 3/ catalyst, over the entire interval of temperatures investigated, E = 10.6 kJ/mole. Warming of this catalyst over an extended period in hydrogen led to the appearance of a break on the Arrhenius line at 120/sup 0/K, below which E = 0. In the case of the nickel films, warming in hydrogen, as well as adsorption of preatomized hydrogen led to changes in the course of the temperature dependence of K/sub sp/: The break on the Arrhenius line was observed at 190/sup 0/K, with a zero activation energy below this temperature, and an activation energy above this temperature that had been increased to 30 kJ/mole. The reasons for these changes are discussed on the basis of assumptions of a difference in forms ofmore » adsorbed hydrogen. 3 figures, 1 table.« less

Authors:: Zhavoronkova, K N; Perevezentseva, N N

Publication Date:: Sun May 01 00:00:00 EDT 1983

Research Org.:: D.I. Mendeleev Moscow Chemical Tech. Inst., USSR

OSTI Identifier:: 5135877

Resource Type:: Journal Article

Journal Name:: Kinet. Catal. (Engl. Transl.); (United States)

Additional Journal Information:: Journal Volume: 24:3

Country of Publication:: United States

Language:: English

Subject:: 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CHROMIUM OXIDES; CATALYSIS; HYDROGEN; ADSORPTION; ISOTOPIC EXCHANGE; NICKEL OXIDES; ACTIVATION ENERGY; ARRHENIUS EQUATION; CATALYSTS; FILMS; LOW TEMPERATURE; MEDIUM TEMPERATURE; MEDIUM VACUUM; NICKEL; TEMPERATURE DEPENDENCE; CHALCOGENIDES; CHROMIUM COMPOUNDS; ELEMENTS; ENERGY; EQUATIONS; METALS; NICKEL COMPOUNDS; NONMETALS; OXIDES; OXYGEN COMPOUNDS; SORPTION; TRANSITION ELEMENT COMPOUNDS; TRANSITION ELEMENTS; 400203* - Isotope Exchange & Isotope Separation- (-1987)

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                    Zhavoronkova, K N, and Perevezentseva, N N. Homomolecular isotope exchange of hydrogen on nickel - chromia catalystand on nickel films.  United States: N. p., 1983. 
        Web.

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                    Zhavoronkova, K N, & Perevezentseva, N N. Homomolecular isotope exchange of hydrogen on nickel - chromia catalystand on nickel films.  United States.

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                    Zhavoronkova, K N, and Perevezentseva, N N. 1983.  
        "Homomolecular isotope exchange of hydrogen on nickel - chromia catalystand on nickel films".  United States.

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@article{osti_5135877,

  title        = {Homomolecular isotope exchange of hydrogen on nickel - chromia catalystand on nickel films},

  author       = {Zhavoronkova, K N and Perevezentseva, N N},

  abstractNote = {The specific catalytic activity (K/sub sp/) of commercial Ni/Cr/sub 2/O/sub 3/ catalyst and of nickel films has been investigated in the reaction of isotope exchange in molecular hydrogen at temperatures of 77-293/sup 0/K and a pressure of 0.5mm Hg. For the nickel films, a break was observed in the Arrhenius plot at 130/sup 0/K; the values of the activation energy E for the low-temperature and high-temperature regions were 0 and 6 kJ/mole, respectively. For the Ni/Cr/sub 2/O/sub 3/ catalyst, over the entire interval of temperatures investigated, E = 10.6 kJ/mole. Warming of this catalyst over an extended period in hydrogen led to the appearance of a break on the Arrhenius line at 120/sup 0/K, below which E = 0. In the case of the nickel films, warming in hydrogen, as well as adsorption of preatomized hydrogen led to changes in the course of the temperature dependence of K/sub sp/: The break on the Arrhenius line was observed at 190/sup 0/K, with a zero activation energy below this temperature, and an activation energy above this temperature that had been increased to 30 kJ/mole. The reasons for these changes are discussed on the basis of assumptions of a difference in forms of adsorbed hydrogen. 3 figures, 1 table.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/5135877},
  journal      = {Kinet. Catal. (Engl. Transl.); (United States)},
number       = ,

  volume       = 24:3,

  place        = {United States},

  year         = {Sun May 01 00:00:00 EDT 1983},

  month        = {Sun May 01 00:00:00 EDT 1983}

}

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