Catalytic reduction of oxides of nitrogen emissions in auto exhaust gas
A program for developing catalysts for use in the control of nitrogen oxides from automotive exhaust is discussed. A stabilized supported ruthenium catalyst for use as the nitrogen oxides reduction bed in a dual-bed system was evaluated in laboratory bench tests and on an engine dynamometer with lead sterile and unleaded fuel (0.035 g lead/gallon, 340 ppm sulfur). Exposing the catalyst to high temperature lean operation on an engine-dynamometer showed that the catalyst was not completely stable to such an environment. An initial evaluation of three-way conversion catalyst showed that good conversion of carbon monoxide, hydrocarbons, and nitrogen oxides was maintained after exposure to elevated temperatures under oxidizing conditions using unleaded fuel.
- OSTI ID:
- 7348133
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
330701* -- Emission Control-- Nitrogen Oxides
330702 -- Emission Control-- Carbon Monoxide
330704 -- Emission Control-- Hydrocarbons
AUTOMOBILES
BENCH-SCALE EXPERIMENTS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYTIC CONVERTERS
CHALCOGENIDES
CHEMICAL REACTIONS
DYNAMOMETERS
ELEMENTS
EQUIPMENT
HYDROCARBONS
MEASURING INSTRUMENTS
METALS
NITROGEN COMPOUNDS
NITROGEN OXIDES
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PERFORMANCE TESTING
PLATINUM METALS
POLLUTION CONTROL EQUIPMENT
REDUCTION
REFRACTORY METALS
RUTHENIUM
TEMPERATURE EFFECTS
TESTING
TRANSITION ELEMENTS
VEHICLES