The oxidizing catalyzer is a post-treatment
device for oxidizing the CO, HC and particle matter, transforming
them into carbon dioxide (CO2) and water vapour (H2O). The catalytic converter consists of a ceramic,
honeycomb structure monolith (1) with cells impregnated with platinum
(2), which acts as a catalyst for the oxidation process.
OPERATION
The exhaust gases which pass through the
cells heat the catalyzer, triggering the conversion of the pollutants
into inert compounds.The chemical reaction which causes the oxidation
of the CO, HC, and particle matter takes place at temperatures of
between 200 and 350°C.In effect, at temperatures above 350°C
the sulphur, contained in the diesel fuel, starts to oxidize, producing
sulphur dioxide and sulphuric anhydride.
