Catalytic Converters

The Catalytic Converter: Coating Overview
Components of coating Catalytic Converters:
Aluminium Oxide
  • Increase of surface area by a factor of approx. 10,000
  • High precious metal dispersion
  • Durability (temperature as well as poison resistance)
Cerium Oxide:
  • Oxygen storage and release under cycling exhaust conditions
  • Lambda - Window
Zirconium Oxide/Promoters:
  • Increase of temperatures stability
  • Catalytic active Precious Metals (Pt, Pd, Rh)
  • Substrate/ Monolith
  • Cordierite/ Metal
  • Volume/ CPSI/ Wall thickness
The Catalytic Converter: Facts

The catalytic converter is an element of the exhaust system, which transforms the polluting exhaust gases into non-polluting gases.

SCR Technology: Selective Catalytic Reduction Technology
SCR Technology is designed to permit nitrogen oxide (NOx) reduction reactions to take place in an oxidizing atmosphere. It is called "selective" because it reduces levels of NOx using ammonia as a reductant within a catalyst system. The reducing agent reacts with NOx to convert the pollutants into nitrogen, water and tiny amounts of carbon dioxide (CO2) - natural elements common to the air we breathe everyday. The reductant source is usually automotive-grade urea, otherwise known as Diesel Exhaust Fluid Blue, which can be rapidly hydrolysed to produce the oxidizing ammonia in the exhaust stream. SCR Technology alone can achieve NOx reductions in excess of 90%
3 Way Catalytic Converter

For it's correct operation, it is necessary that the mixture relation air fuel value is:

1 part fuel : 14.7 parts air (Stoichiometric Ratio), Lambda 1


  • CO = Carbon Monoxide
  • HC = Hydro carbons
  • NOx = Nitrogen Oxide
  • H2O = Water
  • CO2 = Carbon Dioxide
  • N2 = Nitrogen
  • 02 = Dioxygen