Performance of copper base metal catalysts in stoichiometric automotive exhausts

Conference · Thu Jan 01 00:00:00 EST 1987

OSTI ID:5032581

Williamson, W B; Summers, J C; White, J J; Marinangeli, R E

Durability performance characteristics of copper-containing base metal catalysts and base metallow noble metal catalysts have been determined in laboratory and engine aging conditions under well controlled stoichiometric closed-loop AF operation. Cu-Cr base metal formulations yield significant HC and CO conversions under stoichiometric operation after aging at 620/sup 0/C, but deteriorate rapidly at high-temperature (750/sup 0/C inlet) stoichiometric operation. Incorporation of Rh into the base metal formulation substantially improved NO/sub x/ performance, a major weakness of base metal catalysts. The addition of Cu-Cr base metals substantially improves CO oxidation over Pt, Pd, and Rh catalysts but was accompanied by some loss of HC conversion over Pt and Rh. A Cu-CrPd catalyst, however, also had better HC conversions as well as significantly improved light-off performance when compared to a Pd-only catalyst. The stoichiometric operating strategy and performance envelope for base metal catalysts were probed in engine dynamometer and vehicle studies. The aged performance of the Cu containing catalysts is significantly lowered by lean AF preconditioning due probably to sulfur poisoning of Cu at low-temperature lean operating conditions.

• OSTI ID: 5032581
• Report Number(s): CONF-871142-
• Resource Relation: Conference: International fuels and lubricants meeting and exposition, Toronto, Canada, 2 Nov 1987; Other Information: Technical Paper 872132
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
54 ENVIRONMENTAL SCIENCES
COPPER BASE ALLOYS
AIR POLLUTION CONTROL
CATALYTIC EFFECTS
CHEMICAL COMPOSITION
AUTOMOBILES
CARBON MONOXIDE
CHROMIUM ALLOYS
EMISSION
FUEL-AIR RATIO
HYDROCARBONS
NITROGEN OXIDES
PERFORMANCE
QUANTITY RATIO
RHODIUM ALLOYS
SPARK IGNITION ENGINES
ALLOYS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CONTROL
COPPER ALLOYS
ENGINES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
NITROGEN COMPOUNDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METAL ALLOYS
POLLUTION CONTROL
VEHICLES
330700* - Advanced Propulsion Systems- Emission Control
330101 - Internal Combustion Engines- Spark-Ignition
500200 - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)