Description
(1) pre-catalyst
"a" exhaust gas inlet
"b" exhaust gas outlet (to the catalytic converter)
Composition of the pre-catalyst
- A stainless steel casing
- A thermic insulator
- A ceramic honeycomb core impregnated with precious metals
Role
Through oxidation the pre-catalyst converts the carbon monoxide (CO), nitrogen oxides (NOx) and unburnt hydrocarbons (HC) into water (H2O), nitrogen (N2) and carbon gas (CO2)
Function
(1) pre-catalyst
"c" precious metals
"d" honeycomb ceramic block
The carbon monoxide (CO), nitrogen oxides (NOx) and unburnt hydrocarbons (HC) are converted by means of a chemical reaction produced by the precious metals contained in the pre-catalyst
This reaction is possible when the temperature of the pre-catalyst is higher than 200 °C
Electrical features
Not applicable
Programming/initialisation
Not applicable