| Autor: |
Eisaku Suda, Kenzo Kanda, Hayao Imamura, Susumu Tsuchiya, Yoshihisa Sakata, Katsuhiko Mizuno, Kazutaka Ohishi |
| Rok vydání: |
1998 |
| Předmět: |
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| Zdroj: |
Journal of Alloys and Compounds. :903-907 |
| ISSN: |
0925-8388 |
| DOI: |
10.1016/s0925-8388(98)00481-2 |
| Popis: |
The catalytic properties of lanthanide amide, imide and nitride prepared by the use of liquid ammonia solutions of lanthanide metals (Ln=Eu and Yb) were studied for catalytic hydrogenation. The reaction of Eu or Yb metal solutions in liquid ammonia with silica yielded SiO 2 -grafted lanthanide amide in the divalent state. The divalent amide showed catalytic activity for the selective hydrogenation of dienes and benzene. It was found that partial hydrogenation of benzene occurred with a very high selectivity for cyclohexene. Amides of calcium, strontium and barium were examined similarly in connection with catalytic studies on divalent amides. Imide and nitride, into which the lanthanide (Ln/AC) deposited by impregnation of active carbon (AC) with liquid ammonia solutions of lanthanide metals were converted thermally, were studied catalytically. It was concluded that imide or imide-like species generated during the thermal degradation of lanthanide amide to nitride were very active in the hydrogenation of ethene. Lanthanide nitride was virtually inactive, but the nitride highly dispersed on active carbon was activated when subjected to evacuation treatment above about 1000 K. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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