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Rh-free three-way catalysts for automotive exhaust control

Book ·
OSTI ID:5926472
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Platinum, palladium, and rhodium catalysts are evaluated on an engine dynamometer to examine the effects of air-fuel ratio (A/F), A/F amplitude and its frequency on the conversion efficiencies of NO/sub x/, THC and CO. Under steady-state conditions, Rh is more suitable for NO/sub x/ conversion than Pt and Pd. With increasing A/F amplitude, A/F for the maximum NO/subx conversion is shifted to rich side, while A/F for the maximum THC and CO conversions are shifted to the lean side. At the stoichiometric point, both Pt and Pd show the maximum conversions for particular frequency and their frequencies are shifted to higher values with increasing A/F amplitude. If the A/F amplitude and the frequency are selected to be optimum, Pt and Pd may be used as three-way catalysts (TWC). As a result of the durability testing until 50,000 km, Pd is promising as a main component of Rh-free TWC.
OSTI ID:
5926472
Report Number(s):
TP-850129
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
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION ABATEMENT
AMPLITUDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CATALYTIC CONVERTERS
CATALYTIC EFFECTS
CHALCOGENIDES
DIRECT ENERGY CONVERTERS
DYNAMOMETERS
ELEMENTS
EQUIPMENT
FREQUENCY DEPENDENCE
FUEL-AIR RATIO
HYDROCARBONS
MEASURING INSTRUMENTS
METALS
NITROGEN COMPOUNDS
NITROGEN OXIDES
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PALLADIUM
PERFORMANCE TESTING
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
PLATINUM
PLATINUM METALS
POLLUTION ABATEMENT
POLLUTION CONTROL EQUIPMENT
RHODIUM
SERVICE LIFE
SILICON SOLAR CELLS
SOLAR CELLS
SOLAR EQUIPMENT
STOICHIOMETRY
TESTING
TRANSITION ELEMENTS
VEHICLES