Catalyst for the purification of exhaust gases of internal combustion engines
Patent
·
OSTI ID:5646960
A three-way catalyst is described for the purification of automobile exhaust gases formed of an active substance of platinum and rhodium and possibly base metal(S) at a certain weight ratio between the two noble metals and at a certain atomic ratio between the noble and the base metal, which are precipitated onto active aluminum oxide containing certain quantities of CeO2, ZrO2 and Fe2O3, and whereby the catalyst is obtained by impregnating active aluminum oxide, possibly stabilized with alkaline earth metal, with a solution of cerium, zirconium and iron salt which is thereupon calcined in air at 500 degrees-700 degrees C. And then treated after application of impregnation of salts of the active substance components in a gas current containing hydrogen at temperatures below 650 degrees C.
- Assignee:
- Degussa (Germany, Federal Republic of)
- Patent Number(s):
- US 4294726
- OSTI ID:
- 5646960
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
42 ENGINEERING
424000 -- Engineering-- Pollution Control Equipment-- (1980-1989)
ALUMINIUM
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYSTS
CATALYTIC EFFECTS
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
CHEMICAL PREPARATION
ELEMENTS
EXHAUST GASES
FLUIDS
GASEOUS WASTES
GASES
IMPREGNATION
IRON COMPOUNDS
IRON OXIDES
METALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
PURIFICATION
RARE EARTH COMPOUNDS
REFRACTORY METALS
RHODIUM
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
WASTES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES
400201* -- Chemical & Physicochemical Properties
42 ENGINEERING
424000 -- Engineering-- Pollution Control Equipment-- (1980-1989)
ALUMINIUM
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYSTS
CATALYTIC EFFECTS
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
CHEMICAL PREPARATION
ELEMENTS
EXHAUST GASES
FLUIDS
GASEOUS WASTES
GASES
IMPREGNATION
IRON COMPOUNDS
IRON OXIDES
METALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
PURIFICATION
RARE EARTH COMPOUNDS
REFRACTORY METALS
RHODIUM
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
WASTES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES