Products - Europe

Diesel Oxidation Catalysts (DOCs)

Reducing harmful vehicle emissions and required maintenance.

CDTi DOCs consist of either a ceramic (AX, AZ series) or a metallic (DZ series) monolith, coated with advanced precious metal catalysts and packaged into stainless steel housings.

These DOCs oxidize hazardous carbon monoxide (CO) and hydrocarbons (HC) to form carbon dioxide and water. CDTi AZ/AX DOCs also reduce total particulate (SOF) emissions up to 40%.*

Our DOCs are designed for ease of installation and require little or zero maintenance. Our models include:


Purifier Model AZ

  • Available in 11 sizes for engines up to 560 kW
  • CO and HC reduction up to 95% and particles up to 40%*
  • Can be designed as a combined catalyst and silencer to replace existing vehicle silencer
  • Customized design to a large number of machines
  • Can be combined with the Unikat® Combifilter®
  • Certified by AVL/ MTC, Sweden


Purifier Model EZ / DZ

  • Available in 23 standard models for engines up to 660 kW
  • Low exhaust back pressure
  • Compact size suitable for limited space
  • Customized design to a large number of machines

Brochures for our DOCs are available for download in English and French.

*Current verified technology reduction values are dependent upon the specific engine type and application.