Nickel/Chromium Oxide/Magnesium Oxide-Mixed Catalysts for Deuterium Exchange between Hydrogen and Water Vapour (English)

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In: Isotopes in Environmental and Health Studies   ;  13 ,  5  ;  179-182  ;  1977

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A ternary system composed of Ni/Cr2O3/MgO-Mixture was prepared by co-precipitation from the corresponding metal nitrates using Na2CO3 at room temperature. The precipitant was thermally treated at 350 °C in nitrogen atmosphere, followed by reduction at 320 °C, and then stabilized against spontaneous oxidation in air by impregnating it in bidistilled water and allowing slow oxidation to lake place while water evaporates. The specific catalytic activity of the prepared Ni/Cr2O3/MgO mixture for the isotopic exchange of deuterium between hydrogen and water vapour was measured using an exchange apparatus. The specific surface area for the catalyst mixtures was evaluated by nitrogen adsorption al liquid nitrogen temperature and application of the BET-equalion. The specific metallic surface area, the degree of dispersion and the average particle size of Ni/Cr2O3/MgO catalyst mixtures were also calculated through chemisorption of pure hydrogen. Comparison of the specific catalytic activity with the surface characteristics of the mixed catalysts indicates that the catalyst of the highest activity for the deuterium exchange between hydrogen and water vapour exhibit maximum specific metallic surface area, maximum percentage dispersion and minimum particle size.

Table of contents – Volume 13, Issue 5

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149
Radioaktive Nuklide in der Pestizid-Forschung Teil VII: Fungizide, Herbizide, andere Pestizide und Hilfsstoffe
Dedek, W. | 1977
155
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Thummel, H. -W. | 1977
161
Radioaktive Verschleissmessungcn an Wendeschneidplattchen aus Hartmetall beim Zerspanen von AIuminium-Automatenlegierungen
Frevert, E. | 1977
169
X-Ray Fluorescence Detector for Stainless Steel-316
Jain, S. K. / Gupta, P. P. | 1977
172
Radioactive Radiation “Degree-Meter”
Damljanovic, D. | 1977
174
Chemical and Ion Exchange in Isotope Separation with Special Reference to Heavy Elements: Part II. — Computer Calculations for Multiplication of Isotope Effect Corresponding to Isotopic Exchange Processes
Gard, E. / Călusaru, A. | 1977
179
Nickel/Chromium Oxide/Magnesium Oxide-Mixed Catalysts for Deuterium Exchange between Hydrogen and Water Vapour
Abou El-Nour, F. / Abdel-Khalik, M. / Belacy, N. / Hallaba, E. | 1977
183
Bestimmung des Wirkungsquersehnittes der Reaktion 88Sr(n,p)88Rb fur Spaltneutronen
Pfrepper, G. / Apostolov, D. / Raitschev, C. | 1977
184
Tagungsberichte
Becker, B. / Becker, E. | 1977
186
XX. Tagung der Generalkonferenz der IAEA
Scheel, H. | 1977
187
Bericht uber eine Ausstellung von “Techsnabexport”
Dictzsch, W. | 1977
189
“1976 International Conference: Modern Trends in Activation Analysis” vom 13.-17. September 1976 in Munchen
Niese, S. | 1977
189
Informationen
| 1977
190
Buchbesprechungen
| 1977
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