Platinum, rhodium, and palladium catalyst for automotive emission control

Patent · Tue May 08 04:00:00 EDT 1979

OSTI ID:6104585

Summers, J C; Hegedus, L

The invention discloses a three-way layered catalyst for use in a stoichiometric air/fuel ratio system comprising an alumina support having deposited thereon the catalyst materials platinum, palladium, and rhodium and having a first layer of platinum positioned at the support surface, a second layer of catalyst material selected from the group consisting of rhodium and a mixture of palladium and rhodium adjacent to and radially inward of the first layer with palladium inward of and adjacent to the second layer where the catalyst material of such layer is rhodium. Cerium oxide may be added to the support for improved performance.

• Assignee: General Motors Corp.
• Patent Number(s): US 4153579
• OSTI ID: 6104585
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330700* -- Advanced Propulsion Systems-- Emission Control
AIR POLLUTION CONTROL
AUTOMOBILES
CATALYTIC CONVERTERS
DESIGN
ELEMENTS
ENGINES
EQUIPMENT
EXHAUST GASES
GASEOUS WASTES
INTERNAL COMBUSTION ENGINES
METALS
PALLADIUM
PLATINUM
PLATINUM METALS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
REFRACTORY METALS
RHODIUM
TRANSITION ELEMENTS
VEHICLES
WASTES