Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1978-07-11
1980-07-15
Shine, W. J.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
252447, C07C 8511, B01J 2118, B01J 2342, B01J 2374
Patent
active
042128242
ABSTRACT:
An iron-modified, platinum hydrogenation catalyst useful for the reduction of aromatic nitro compounds is provided. The catalyst, having improved distribution of the metallic components on an oleophilic carbon support as shown by ESCA analysis, is prepared by depositing a platinum compound (oxide, hydroxide or carbonate) on the carbon support at a temperature in the range of 55.degree.-95.degree. C., preferably 90.degree.-95.degree. C., and then reducing the compound to platinum metal, preferably with formaldehyde, at a temperature less than about 35.degree. C. The iron in the catalyst is present and deposited as its oxide or hydroxide either at the same temperature as the platinum compound or at a temperature less than about 35.degree. C. Using such a catalyst to reduce halogen-substituted nitro aromatic compounds to the corresponding amines results in low dehalogenation, low tar formation and hydroxylamine accumulation. For nonhalogenated nitro aromatic reductions, the catalyst minimizes ring reduction.
REFERENCES:
patent: 2823235 (1958-02-01), Graham
patent: 3499034 (1970-03-01), Gonzalez
E. I. Du Pont de Nemours and Company
Shine W. J.
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