Abstract
The effects of alumina dissolution and metal ion buffering on the dispersion of alumina supported nickel and ruthenium catalysts were studied. It is shown that ruthenium salts are stronger buffers of the impregnating solution. As a consequence, at low initial pH values of each impregnant, more free aluminum is released to the aqueous phase in ruthenium electrolytes than in nickel electrolytes. For catalysts prepared from these electrolytes, the dispersions of Ni/Al 2O 3 catalysts vary dramatically with weight loading and initial impregnant pH. On the other hand, Ru/Al 2O 3 catalysts have comparable dispersions for more than a factor of five increase in weight loading. These results are consistent with the proposal that alumina dissolution facilitates continuous generation of adsorption sites, and thus higher concentrations of metal salt precursor can be accommodated during impregnation.
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