Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Legacy 2000-2003 Approved Subaru Legacy 2000 2000 Service Manual MECHANISM AND FUNCTION SECTION Emission Control System and Vacuum Fitting MSA5TCD00L18132

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                              MECHANISM AND FUNCTION                                  [M400]   2-1
                                                                                4.Three-way Catalyst

4. Three-way Catalyst
D The basic material of three-way catalyst is platinum (Pt), rhodium (Rh) and palladium (Pd), and
a thin coat of their mixture is applied onto honeycomb or porous ceramics of an oval shape (carri-
er). To avoid damaging the catalyst, only unleaded gasoline should be used.
D The catalyst is used to reduce HC, CO and NOx in exhaust gases, and permits simultaneous
oxidation and reduction. To obtain an excellent purification efficiency on all components HC, CO
and NOx, a balance should be kept among the concentrations of the components. These con-
centrations vary with the air-fuel ratio.
D The air-fuel ratio needs to be controlled to a value within the very narrow range covering around
the stoichiometric mixture ratio to purify the components efficiently.


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