Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Impreza 2001-2002.2004-2007 Approved Subaru Impreza 2004 WRX STi 08. MECHANISM AND FUNCTION 03. EMISSION CONTROL (Aux. Emission Control Devices) 04. Three-way catalytic converter
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W1860BE.book Page 8 Tuesday, January 28, 2003 11:01 PM
THREE-WAY CATALYTIC CONVERTER
EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES)
4. Three-way catalytic converter
The basic materials of the three-way catalytic converter are platinum (Pt), rhodium (Rh) and pal-
ladium (Pd), and a thin coat of their mixture is applied onto a honeycomb or porous ceramic (carri-
er). To avoid damaging the catalytic converter, only unleaded gasoline should be used.
The catalytic converter reduces HC, CO and NOx in exhaust gases through chemical reactions
(oxidation and reduction). These harmful components are reduced most efficiently when their con-
centrations are in a certain balance. These concentrations vary with the air-fuel ratio. The ideal air-
fuel ratio for reduction of these components is the stoichiometric ratio.
Therefore, the air-fuel ratio needs to be controlled to around the stoichiometric ratio to purify the
exhaust gases most efficiently.
EC(H4SO)-8
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