Effective rhodium utilization in automotive exhaust catalysts

Conference · Wed Jan 01 04:00:00 EST 1986

OSTI ID:5501381

Wan, C Z; Dettling, J C

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-
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330700* -- Advanced Propulsion Systems-- Emission Control
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ABSTRACTS
AGING
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CALIBRATION
CATALYSTS
CATALYTIC CONVERTERS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
COMPARATIVE EVALUATIONS
DOCUMENT TYPES
DYNAMOMETERS
ELEMENTS
EQUIPMENT
EXHAUST GASES
FLUIDS
FUEL-AIR RATIO
GASEOUS WASTES
GASES
HEAT TREATMENTS
HYDROGEN COMPOUNDS
KINETICS
LEADING ABSTRACT
MEASURING INSTRUMENTS
MEETINGS
METALS
OXIDES
OXYGEN COMPOUNDS
PERFORMANCE TESTING
PLATINUM METALS
POLLUTION CONTROL EQUIPMENT
RARE EARTH COMPOUNDS
REACTION KINETICS
RESEARCH PROGRAMS
RHODIUM
TESTING
TRANSITION ELEMENTS
VEHICLES
WASTES
WATER