Catalyst for purification of exhaust gases and processes for its production and use
AssigneeDeutsche Gold- und Silber-Scheideanstalt vormals Roessler
InventorsEdgar Koberstein, Eduard Lakatos
Life of this patent
Estimating the term…
Abstract
A carrier catalyst comprises as the catalytically active component an intermetallic system of at least three metals, wherein at least one of said three metals is selected from the group consisting of (a) ruthenium, rhodium, palladium and platinum, and wherein at least one of said three metals is a base metal selected from the group consisting of (b) aluminum, titanium, chromium, manganese, cobalt and nickel, and further wherein said group (a) metals and said group (b) metals are in an atomic ratio of about 1:4 to 1:1, provided that, when said system contains platinum, rhodium and at least one of said base metals, the atomic ratio is 1:4 to 1:2.4. The catalyst can also contain aluminum.
Claims54
A carrier catalyst comprising an intermetallic system of at least three metals as catalytically active component, said catalyst comprising the product obtained by contacting a catalyst carrier with an aqueous solution comprising a halide of at least one metal selected from the group consisting of (a) rhodium, palladium and platinum, and a halide of at least one base metal selected from the group consisting of (b) aluminum, titanium, chromium, manganese, cobalt and nickel;
- drying the resulting impregnated carrier;
- and reducing the halides at a temperature of about 450.degree.-1000.degree. C in a stream of hydrogen;
- wherein said group (a) metals and said group (b) metals are in an atomic ratio of group (a) metals to group (b) metals of about 1 :
- 4 to 1 :
- 1;
- provided that, when said system contains platinum, rhodium and at least one of said base metals, said atomic ratio is 1 :
- 4 to 1 :
- 2.4.
A process for the preparation of a carrier catalyst comprising an intermetallic system of at least three metals as catalytically active component, said process comprising:
- 1. contacting a catalyst carrier with an aqueous solution comprising a halide of at least one metal selected from the group consisting of (a) rhodium, palladium and platinum, and a halide of at least one base metal selected from the group consisting of (b) aluminum, titanium, chromium, manganese, cobalt and nickel;
- 2. drying the resulting impregnated carrier;
- and
- 3. reducing the halides at a temperature of about 450.degree.-1000.degree. C in a stream of hydrogen;
- wherein said group (a) metals and said group (b) metals are in an atomic ratio of group (a) metals to group (b) metals of about 1 :
- 4 to 1 :
- 1;
- provided that, when said system contains platinum, rhodium and at least one of said base meals, said atomic ratio is 1 :
- 4 to 1 :
- 2.4
Dependencies are inferred from the claim text.