La description

Catalytic converter (colloquially, “cat” or “catcon”)

A device used to reduce the toxicity of emissions from an internal combustion engine.

Working Principle of Three-way Catalytic converter:

Reduction of nitrogen oxides to nitrogen and oxygen:

2NOx → xO2 + N2

Oxidation of carbon monoxide to carbon dioxide:

2CO + O2 → 2CO2

Oxidation of un-burnt hydrocarbons (HC) to carbon dioxide and water:

CxH2x*2 + [(3x*1)/2]O2 → xCO2 + (x*1)H2O

Catalytic Converter for Passat 1.8T
Vehicle Model: Volkswagon Passat 1.8T / Audi A6 1.8T
Vehicle Year: ***0 ~ present
Engine: Inline 4 Cylinders 1.8L Turbo
Design: One-piece, Converter Body + Flange
Converter Core: Ceramic Substrate **0cpsi (Honeycomb)
Outside Material: **9L Stainless Steel
Operating Way: Three-way
Emission Standard: Euro 2, 3, 4 / EPA Tier 1, 2, 3 / CARB


Note:
Vlokswagen Passat B5/B5.5.