Purification of exhaust gas

Patent · Tue Oct 02 04:00:00 EDT 1973

OSTI ID:7365515

Ishida, Y; Wakita, N; Yokota, M

An apparatus for purifying exhaust gases from an internal combustion engine containing CO, unburned HC, and NO/sub x/ is described. The device consists of an outer shell of heat insulated construction enclosing an inner chamber, an inlet conduit, and an outlet conduit. A heat conductive baffle divides the inner chamber into an upstream reduction zone for NO/sub x/ and a downstream thermal, flame-type oxidation zone having an inlet region connected to the upstream zone. An injection conduit provides air to the exhaust gases passing from the upstream zone into the downstream zone in sufficient quantity to create an oxygen-rich mixture in the downstream zone. The surfaces of the heat conducting baffle that are exposed to the exhaust gases in the upstream and downstream zones are composed of material having dual reducing and oxidizing catalytic activities for reducing the NO/sub x/ in the upstream zone and for augmenting the thermal, flame-type oxidation of CO and HC in the downstream zone by catalytic no-flame oxidation adjacent to the baffle surface.

• Assignee: Toyota Jidosha Kogyo Kabushiki Kaisha
• Patent Number(s): US 3947545
• OSTI ID: 7365515
• 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
AFTERBURNERS
AIR
AUTOMOBILES
BAFFLED TUBES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYTIC CONVERTERS
CHALCOGENIDES
CHEMICAL REACTIONS
DESIGN
EQUIPMENT
EXHAUST GASES
FLUIDS
GASEOUS WASTES
GASES
HYDROCARBONS
NITROGEN COMPOUNDS
NITROGEN OXIDES
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL EQUIPMENT
REDUCTION
TUBES
VEHICLES
WASTES