Bulk catalysts based on chromium and on nickel for the gas-phase fluorination of halogenated hydrocarbons
AssigneeElf Atochem S.A.
InventorsEric Lacroix, Jean-Pierre Schirmann
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Abstract
Catalysts which are useful in the fluorination of halogenated hydrocarbons by HF in the gas phase are obtained by simple impregnation of a bulk chromium oxide with a solution of a nickel derivative, the chromium oxide used exhibiting a BET specific surface of greater than 150 m2/g and a pore volume of greater than 0.15 ml/g.
Claims12
A bulk catalyst comprising chromium and nickel, obtained by impregnation of an amorphous chromium III oxide with a solution of a nickel compound,
- wherein the chromium oxide used exhibits a BET specific surface of greater than 150 m2/g and a pore volume of greater than 0.15 ml/g,
- wherein the catalyst is dried under an inert gas or under air at a temperature of between 100 and 350° C. and then activated with HF, and
- wherein the HF is first introduced diluted in air or, optionally, in an inert gas at a temperature ranging from 150 to 200° C. and then pure HF at a temperature of less than 400° C.;
- further wherein the Ni/Cr atomic ratio is between 0.02 and 0.4:1.
A bulk catalyst comprising chromium and nickel, obtained by impregnation of an amorphous chromium III oxide with a solution of a nickel compound,
- wherein the chromium oxide used exhibits a BET specific surface of greater than 150 m2/g and a pore volume of greater than 0.15 ml/g,
- wherein the nickel compound is nickel nitrate or nickel sulphate,
- wherein the catalyst is dried under an inert gas or under air at a temperature of between 100 and 350° C. and then activated with HF, and
- wherein the HF is first introduced diluted in air or, optionally, in an inert gas at a temperature ranging from 150 to 200° C. and then pure HF at a temperature of less than 400° C.;
- further wherein the Ni/Cr atomic ratio is between 0.02 and 0.4:1.
A bulk catalyst comprising chromium and nickel, obtained by impregnation of an amorphous chromium III oxide with a solution of a nickel compound,
- wherein the chromium oxide exhibits a BET specific surface of greater than 150 m2/g and a pore volume of greater than 0.15 ml/g,
- wherein the Ni/Cr atomic ratio is between 0.02 and 0.4,
- wherein the catalyst is dried under an inert gas or under air at a temperature of between 100 and 350° C. and then activated with HF, and
- wherein the HF is first introduced diluted in air or, optionally, in an inert gas at a temperature ranging from 150 to 200° C. and then pure HF at a temperature of less than 400° C.
A bulk catalyst comprising chromium and nickel, obtained by impregnation of an amorphous chromium III oxide with a solution of a nickel compound,
- wherein the chromium oxide used exhibits a BET specific surface of greater than 150 m2/g and a pore volume of greater than 0.15 ml/g,
- wherein the Ni/Cr atomic is between 0.02 and 0.4,
- wherein the nickel compound is nickel nitrate or nickel sulphate,
- wherein the catalyst is dried under an inert gas or under air at a temperature of between 100 and 350° C. and then activated with HF, and
- wherein the HF is first introduced diluted in air or, optionally, in an inert gas at a temperature ranging from 150 to 200° C. and then pure HF at a temperature of less than 400° C.
A bulk catalyst comprising chromium and nickel, obtained by impregnation of an amorphous chromium III oxide with a solution of a nickel compound,
- wherein the chromium oxide exhibits a BET specific surface of greater than 150 m2/g and a pore volume of greater than 0.15 ml/g,
- further wherein the Ni/Cr atomic ratio is between 0.02 and 0.4.
Dependencies are inferred from the claim text.