Effective rhodium utilization in automotive exhaust catalysts
One vehicles equipped with fuel shut-off, the rhodium in conventional TWC catalyst tends to strongly interact with the washcoat components during the high temperature lean excursions seen during deceleration. Studies were conducted to elucidate the conditions under which rhodium interacts with the alumina washcoat support and the rare earth components used in some of the new ''High Tech'' catalyst compositions. Technology was developed which decreased the rhodium interaction with these washcoat components which permits the catalyst to operate under a much broader set of engine control conditions. Laboratory hydrothermal and dynamometer aging studies were used to demonstrate the feasibility of lowering precious metal usage and especially rhodium content of TWC catalysts without sacrificing ''High Tech'' performance. It is anticipated that this technology will result in lower rhodium TWC catalysts and provide durable catalysts for engine control strategies featuring fuel shut-off or lean A/F ratio calibration.
- OSTI ID:
- 5501381
- Report Number(s):
- CONF-860263-
- Resource Relation:
- Conference: Society of Automotive Engineers international congress and exposition, Detroit, MI, USA, 24 Feb 1986
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
CATALYTIC CONVERTERS
AGING
PERFORMANCE TESTING
VEHICLES
ALUMINIUM OXIDES
CALIBRATION
CATALYSTS
CHEMICAL REACTION KINETICS
COMPARATIVE EVALUATIONS
DYNAMOMETERS
EXHAUST GASES
FUEL-AIR RATIO
HEAT TREATMENTS
LEADING ABSTRACT
MEETINGS
RARE EARTH COMPOUNDS
RESEARCH PROGRAMS
RHODIUM
WATER
ABSTRACTS
ALUMINIUM COMPOUNDS
CHALCOGENIDES
DOCUMENT TYPES
ELEMENTS
EQUIPMENT
FLUIDS
GASEOUS WASTES
GASES
HYDROGEN COMPOUNDS
KINETICS
MEASURING INSTRUMENTS
METALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
POLLUTION CONTROL EQUIPMENT
REACTION KINETICS
TESTING
TRANSITION ELEMENTS
WASTES
330700* - Advanced Propulsion Systems- Emission Control
500200 - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)