System for reducing toxic compounds in exhaust gases from internal combustion engines

Patent · Tue Aug 13 04:00:00 EDT 1974

OSTI ID:7319876

Nishiguchi, K

A system for minimizing the concentration of nitrogen oxides in internal combustion engine exhaust gases while simultaneously reducing the concentration of hydrocarbons and carbon monoxide is described that accomplishes the above in a relatively simple manner. The system incorporates an air denitrogenating unit that separates nitrogen molecules from atmospheric air. The nitrogen molecules are then introduced into an air induction passage of the engine to enrich the air-fuel mixture, resulting in a reduction of nitrogen oxides in the exhaust. The denitrogenated air containing a large proportion of oxygen is supplied into the exhaust manifold of the engine as secondary air for the oxidation of unburned hydrocarbons and carbon monoxide in the exhaust.

• Assignee: Nissan Motor Co., Ltd.
• Patent Number(s): US 3828552
• OSTI ID: 7319876
• 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 POLLUTION CONTROL
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CRYOGENIC FLUIDS
DESIGN
ELEMENTS
ENGINES
EQUIPMENT
FLUIDS
HYDROCARBONS
INTERNAL COMBUSTION ENGINES
MIXING
NITROGEN
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT