Device for purifying exhaust gases by catalytic reaction

Patent · Tue Sep 21 04:00:00 EDT 1976

OSTI ID:7347666

Noguchi, M; Bunda, T; Sumiyoshi, M

An exhaust gas purification apparatus is described for a vehicle in which exhaust gases from an internal combustion engine are subject to a catalytic reaction in a reducing catalyst bed and an oxidizing catalyst bed to remove nitrogen oxides and combustible constituents in the engine exhaust gases. In the device, the reducing catalyst bed and oxidizing catalyst bed are disposed in series in the flowing direction of exhaust gases within a cylindrical casing mounted integrally to a joining portion of exhaust manifold, and secondary air supplying means is provided when the exhaust gas temperature at a point downstream of the catalyst beds is lower than a predetemined setting. A passage for connecting the joining portion of the exhaust manifold directly with an exhaust pipe is provided, and a valve means is disposed in this passage to be opened to pass the exhaust gases through this passage when the exhaust gas temperature detected by a temperature detector mounted to the exhaust pipe is higher than the predetermined setting.

• Assignee: Toyota Jidosha Kogyo Kabushiki Kaisha
• Patent Number(s): US 3981145
• OSTI ID: 7347666
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330701* -- Emission Control-- Nitrogen Oxides
330702 -- Emission Control-- Carbon Monoxide
330704 -- Emission Control-- Hydrocarbons
AIR
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYTIC CONVERTERS
CHALCOGENIDES
CHEMICAL REACTIONS
CONTAINERS
CONTROL EQUIPMENT
DESIGN
ENGINES
EQUIPMENT
EXHAUST GASES
FLOW REGULATORS
FLUIDS
GASEOUS WASTES
GASES
HYDROCARBONS
INTERNAL COMBUSTION ENGINES
MIXING
NITROGEN COMPOUNDS
NITROGEN OXIDES
OPERATION
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL EQUIPMENT
REDUCTION
TEMPERATURE DEPENDENCE
VALVES
VEHICLES
WASTES