Diesel Oxidation Catalyst
Vehicle Emissions Retrofit: Off Road

Diesel Oxidation Catalyst (DOC)

AZ PurifierPollution emitted by diesel fueled engines is a main contributor to the poor air quality found in today’s society. Even with the stricter standards for today’s heavy-duty diesel engines, many existing trucks and buses continue to emit harmful amounts of nitrogen oxides and diesel particulate matter which contributes to very serious health issues in North America.

Fortunately, with the advances in technology we are now able to produce devices to reduce the amount of pollutants which are an unwanted bi-product of older diesel fueled trucks and buses. Using pollution controlling devices such as a diesel oxidation catalyst (DOC) is an excellent example of a device that can be utilized to upgrade your diesel engine or “retrofit” it in order to pollute less.

  • AZ Purifiers and Purimufflers offer an industry leading, verified 20-40% PM (Particulate Matter) reduction* values depending upon on the application. Other manufactures offer only verified PM reduction* values of 20 to 26%. Our competitors claim to offer similar high levels of PM reduction.
  • THE BEST DOC SOLUTION IN THE INDUSTRY, PERIOD! AZ Purifiers and Purimufflers employ an advanced zeolite containing washcoat and precious metal catalyst that afford superior low temperature performance
  • Can be combined with the Closed Crankcase Ventilation (CCV) system which increases verified PM reduction to 40% for all 1991 to 2004 Medium and Heavy Duty Highway engine applications compliant to a 5 or 4 g/hp-hr NOx standard.
  • Why would you buy less PM reduction from another manufacture? AZ Purifiers and Purimufflers™ allow you to reduce more PM from more vehicles.

The DZ series was the first diesel purifier in the industry to feature quick release band clamps. This allows the center body to be readily removed for periodic engine-out opacity measurements or for purifier cleaning. These DZ purifiers are also available with modular add-on DMS and DMXS silencers.AZ Purimuffler TM

The EZ purifier offers the same metallic substrate based catalyst as the DZ purifier but in an all welded purifier to afford the most compact size and lower cost.

* Current EPA Verified Technologies PM reduction values dependent upon the specific engine and application using USLD fuel. Values are subject to change.