| 摘要 |
A finely divided catalyst is prepared by contacting a support with a salt solution of the catalytic metal, reducing the metal ions and subsequently removing the support. The resultant catalyst may be in the form of metal, e.g. Pt, Ru, Rh, Pd, Ir, Os, Re, Cr, V, Ti, Al, Mg, W, Mo, Au, Ag, Pb and Ce and alloys thereof, or metal oxide. The support material may be silica gel or alumina (removable by treatment with a strong alkali), calcium carbonate (removable by treatment with acid), ammonium oxalate or ammonium carbonate (removable by heating to 700 DEG F. or, in the case of ammonium carbonate, by immersion in hot water). The catalyst may be improved by co-reducing the desired catalytic material with a less noble compound; after removal of the support, the less noble component is removed by anodization or dissolution in acid. |
