Hydrodehalogenation catalysts and their preparation and use
AssigneeE. I. Du Pont de Nemours and Company
InventorV. N. Mallikarjuna Rao
Life of this patent
Estimating the term…
Abstract
A carbon-supported metal hydrodehalogenation catalyst is disclosed which is prepared by impregnating a carbon support having an ash content of less than about 0.2% by weight (based on the weight of said support) with a combination of metals consisting essentially of from 5 to 95 parts by weight gold and from 95 to 5 parts by weight total ruthenium, rhodium, palladium, osmium, iridium, and/or platinum; and treating said impregnated carbon composition to dry the composition and to provide metal of said combination in a reduced state, the impregnation of treatment being accomplished at a temperature of about 350.degree. C. or less. The advantageous use of the catalyst for the catalytic hydrogenolysis of fluorohalocarbons and fluorohalohydrocarbons is also disclosed.
Claims12
A process for the catalytic hydrogenolysis of a cyclic or acyclic compound having the formula C.sub.n H.sub.m F.sub.p X.sub.q wherein n is an integer from 1 to 6, m is an integer from 0 to 12, p is an integer from 1 to 13, q is an integer from 1 to 13 and each X is independently selected from Cl and Br, provided that m+p+q equals 2n+2 when the compound is saturated and acyclic, equals 2n when the compound is saturated and cyclic or is olefinic and acyclic, and equals 2n-2 when the compound is olefinic and cyclic which is characterized by:
- (a) employing a carbon-supported metal hydrodehalogenation catalyst prepared by impregnating a carbon support having an ash content of less than about 0.2% by weight, with a combination of metals consisting essentially of from 5 to 95 weight percent gold and from 95 to 5 weight percent total of at least one metal selected from the group consisting of ruthenium, rhodium, palladium, osmium, iridium, and platinum at a temperature of about 350.degree. C. or less:
- and treating said impregnated carbon composition at a temperature of about 350.degree. C. or less to dry the composition and to provide metal of said combination in a reduced state;
- and
- (b) operating at a temperature of from about 125.degree. C. to 350.degree. C.
Dependencies are inferred from the claim text.