Ruthenium Ru C

The feasibility of carbon-supported nickel-based catalysts as the alternative to the platinum catalyst is studied in this chapter. Carbon-supported nickel (Ni/C, 10 wt-metal% [12]), ruthenium (Ru/C, 10 wt-metal% [12]), and nickel-ruthenium composite (Ni-Ru/C, 10 wt-metal%, mixed molar ratio of Ni/Ru 0.25,1,4, 8, and 16 [12]) catalysts were prepared similarly by the impregnation method. Granular powders of the activated carbon without the base pretreatment were stirred with the NiCl2, RuC13, and NiCl2-RuCl3 aqueous solutions at room temperature for 24 h, respectively. Reduction and washing were carried out in the same way as done for the Pt/C catalyst. Finally, these nickel-based catalysts were evacuated at 70°C for 10 h. 

A related mechanism involving insertion of a triple bond into a vinylidene ruthenium Ru=C bond has been postulated for the cyclocarbonylation of 1,1 -bis(trimethylsilyl)ethynylferrocene [64] according to Eq. (8). 

Ruthenium Ru/C, Ru/Si02 60-70 1 70-100 20 Phenole Phenola ther Aminophenole aromatische u. hetero-aromatische Systeme aliphatische Carbonyl-Ver-bindungen spez. Zucker... 

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