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Method and apparatus for treating exhaust gases

Patent ·
OSTI ID:7259924
; ;
A method and means for catalytically removing impurities found in the exhaust stream emanating from the internal combustion engine is described. Such exhaust gases are initially brought into contact with a metallic oxidation catalyst at a temperature sufficient to cause a significant amount of the unreacted oxygen present to be removed by reacting it with oxidizable materials in the exhaust gases, with the oxidation catalyst employed being characterized by its lack of activity with respect to converting nitrogen and hydrogen found in exhaust gases into ammonia. The so-treated exhaust gases are then brought into contact with a nitrogen oxide (NO/sub x/) reducing catalyst, which is also characterized by its lack of activity with respect to converting nitrogen and hydrogen found in the exhaust gases into ammonia, at a temperature sufficient to cause nitrogen oxide gases in the exhaust gases to be catalytically reduced. Subsequently, the resultant exhaust gases are then brought into contact with an oxidation catalyst in an oxygen containing atmosphere at a temperature sufficient to cause carbon monoxide and gaseous hydrocarbons present in the exhaust gases to be oxidized to less harmful substances.
Assignee:
Gould Inc.
Patent Number(s):
US 3978193
OSTI ID:
7259924
Country of Publication:
United States
Language:
English

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Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330701* -- Emission Control-- Nitrogen Oxides
330702 -- Emission Control-- Carbon Monoxide
330704 -- Emission Control-- Hydrocarbons
AMMONIA
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CATALYTIC CONVERTERS
CHALCOGENIDES
CHEMICAL REACTIONS
DESIGN
ENGINES
EQUIPMENT
EXHAUST GASES
GASEOUS WASTES
HYDRIDES
HYDROCARBONS
HYDROGEN COMPOUNDS
INTERNAL COMBUSTION ENGINES
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NITROGEN OXIDES
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL EQUIPMENT
REDUCTION
WASTES