| Autor: |
Pirogova, G. N., Prokhorets, N. M., Korosteleva, R. I., Voronin, Yu. V. |
| Zdroj: |
Russian Chemical Bulletin; February 1986, Vol. 35 Issue: 2 p264-269, 6p |
| Abstrakt: |
1.The influence of the nature of the support on the catalytic activity of technetium has been established for reactions of cyclohexane and isopropanol dehydrogenation. The most active are Tc/MgO and Tc/REE oxides; the least active are Tc/SiO2, Tc/C, and Tc/TiO2.2.Temperature-programmed reduction of the system consisting of ammonium pertechnetate and a support has shown that SiO2 plays the role of a dispersing agent, whereas Y2O3 and ?-Al2O3 interact with the NH4TcO4.3.When CO is adsorbed on Tc ?-Al2O3 or Tc/Y2O3, linear and bridge surface structures are formed. On Tc/MgO, in addition to these structures, multicenter carbonyl structures are found.4.An examination of diffuse reflection spectra in all stages of catalyst preparation has shown that in the most active catalysts, an ionic species of technetium is preserved along with metallic technetium; this ionic species has a modifying effect on the processes of alcohol and cyclohexane dehydrogenation. |
| Databáze: |
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| Externí odkaz: |
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