Method of producing monolithic catalyst for purification of exhaust gas

Patent · Tue May 06 00:00:00 EDT 1986

OSTI ID:5731874

Sawamura, K; Eto, Y; Mine, J; Masuda, K

A method is described of producing a monolithic catalyst for simultaneous oxidation of carbon monoxide and hydrocarbons and reduction of nitrogen oxides in exhaust gases of internal combustion engines, the method including the steps of providing an active alumina base coating to a monlithic carrier by treating the monolithic carrier with a coating slip in which an active alumina powder containing cerium oxide, which is formed by thermal decomposition of a cerium salt applied to the active alumina as a solution, is dispersed and then baking the treated carrier, and depositing at least one noble metal selected from the group consisting of Pt, Rh and Pd on the coating by thermal decomposition of an aqueous solution of a compound of each selected noble metal on the coating, characterized in that a ceria powder is additionally dispersed in the coating slip; wherein the amount of the ceria powder is such that, in the coating, Ce of the ceria powder amounts to 5 to 50% by weight of the coating, and wherin the content of Ce in the active alumina powder is in the range from 1 to 5% by weight.

• Assignee: Nissan Motor Co., Ltd., Yokohama City
• Patent Number(s): US 4587231
• OSTI ID: 5731874
• Resource Relation: Patent File Date: Filed date 15 Nov 1984
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
54 ENVIRONMENTAL SCIENCES
CARBON MONOXIDE
OXIDATION
CATALYSTS
CHEMICAL PREPARATION
EXHAUST GASES
PURIFICATION
HYDROCARBONS
INTERNAL COMBUSTION ENGINES
NITROGEN OXIDES
REDUCTION
AIR POLLUTION ABATEMENT
ALUMINIUM OXIDES
CERIUM OXIDES
COATINGS
PALLADIUM
PLATINUM
POWDERS
PYROLYSIS
RHODIUM
ALUMINIUM COMPOUNDS
CARBON COMPOUNDS
CARBON OXIDES
CERIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
DECOMPOSITION
ELEMENTS
ENGINES
FLUIDS
GASEOUS WASTES
GASES
HEAT ENGINES
METALS
NITROGEN COMPOUNDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
POLLUTION ABATEMENT
RARE EARTH COMPOUNDS
SYNTHESIS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS
WASTES
330100* - Internal Combustion Engines
500200 - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)