Base metal automotive exhaust catalysts with improved activity and stability and method of making the catalysts
This patent describes a catalyst for the treatment of automobile exhaust gas. It comprises a support member carrying a catalytically active particulate washcoat layer, the washcoat consisting essentially of a mixture of finely divided ceric oxide carrier particles and alumina carrier particles, the cerium oxide particles having dispersed thereon copper oxide and optionally a mixture of copper oxide with one or more of chromium oxide, manganese oxide and tin oxide, and the aluminum oxide particles optionally containing one or more of the oxides other than copper oxide, wherein the proportion of ceric oxide and alumina on the basis of 100 parts by weight of total carrier particles are 20 to 70 parts ceric oxide and 30 to 80 parts alumina, the amount of copper is 1 to 15 parts per 100 parts of carrier particles, the amount of chromium is 0 to 10 parts per 100 parts of carrier particles, and the amount of tin and manganese are respectively 0 to 25 parts per 100 parts of carrier particles.
- Assignee:
- General Motors Corp., Detroit, MI (United States)
- Patent Number(s):
- US 5063193; A
- Application Number:
- PPN: US 7-534584
- OSTI ID:
- 5479073
- Resource Relation:
- Patent File Date: 6 Jun 1990
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
54 ENVIRONMENTAL SCIENCES
AUTOMOBILES
EXHAUST SYSTEMS
CATALYSTS
CHEMICAL COMPOSITION
CATALYTIC CONVERTERS
AIR POLLUTION CONTROL
ALUMINIUM OXIDES
CATALYTIC CRACKING
CATALYTIC EFFECTS
CERIUM OXIDES
CHROMIUM OXIDES
MANGANESE OXIDES
POLLUTION CONTROL EQUIPMENT
TIN OXIDES
ALUMINIUM COMPOUNDS
CERIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM COMPOUNDS
CONTROL
CRACKING
DECOMPOSITION
EQUIPMENT
MANGANESE COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
PYROLYSIS
RARE EARTH COMPOUNDS
THERMOCHEMICAL PROCESSES
TIN COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
VEHICLES
330700* - Advanced Propulsion Systems- Emission Control
400201 - Chemical & Physicochemical Properties
540120 - Environment
Atmospheric- Chemicals Monitoring & Transport- (1990-)