Method of cleaning exhaust gases

Patent · Tue Dec 18 04:00:00 EST 1973

OSTI ID:7195682

Yamada, M; Kitamura, Y

A method of catalytically treating and cleaning internal combustion exhaust gases comprising hydrocarbons and carbon monoxide while avoiding overheating and thermal destruction of the catalyst bed under operating conditions is described. A pump supplies secondary air which is heated by contact with the exhaust conduit of the engine and sent into the catalyst reaction area. The hydrocarbons and carbon monoxide are oxidized by the catalyst to carbon dioxide and water. The supply of heated secondary air to the catalyst reaction area is discontinued when the catalyst reaches a predetermined temperature. The exhaust gases passing into the catalyst reaction area are cooled, the catalytic reaction stops, and the temperature of the catalyst bed is reduced. The heated secondary air is again supplied to the catalyst reaction area when the catalyst bed has returned to the temperature below the predetermined temperature.

• Assignee: Nippondenso Co., Ltd.
• Patent Number(s): US 3947544
• OSTI ID: 7195682
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330702* -- Emission Control-- Carbon Monoxide
330704 -- Emission Control-- Hydrocarbons
AIR
AUTOMOBILES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYTIC CONVERTERS
CHALCOGENIDES
CHEMICAL REACTIONS
CONTROL
DESIGN
EQUIPMENT
FLUIDS
GASES
HEATING
HYDROCARBONS
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL EQUIPMENT
PUMPS
TEMPERATURE CONTROL
VEHICLES