Diesel Oxidation Catalysts At Great Prices!
  • Custom fit designs for your application
  • Competitive Pricing!
  • Proven success with over 25 years in the emission control industry!
  • Direct fit designs for fast and hassle-free installation
  • Achieve full compliance with OSHA, CARB, EPA, RICE and other regulations
  • Fastest shipping lead-times across USA and Canada
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"The ordering was easy, and the shipping was very fast."J. Rutley, Rutley Rentals, Grand Rapids, MI
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Diesel Oxidation Catalysts

A diesel oxidation catalyst (DOC) is an after-treatment component that is designed to convert carbon monoxide (CO) and hydrocarbons into carbon dioxide (CO2) and water. Catalytic Exhaust Products Ltd. has a field tested diesel oxidation catalyst (DOC) formulation that can help you adhere to strict local emission standards. We have been the industry leader in emission control products for over 25 years and offer a highly efficient and competitively priced diesel oxidation catalyst. Our diesel oxidation catalysts will help equipment operators comply with CARB, CAL OSHA, EPA, MOL, RICE NESHAP and OSHA regulations by effectively reducing dangerous concentrations of harmful carbon monoxide (CO), hydrocarbons (HC) and particulate matter (PM) exhaust pollutants by up to 90%+.


  1. Clamp-On Style Diesel Oxidation Catalyst (P-Model or F-Model):
    The P-Model (plain style) clamp-on style diesel oxidation catalyst is a fully welded purifier unit designed to be installed in line in the engine exhaust system before or after the original equipment muffler. The F-Model (clamped style) diesel oxidation catalyst are similar to the plain style exhaust purifiers in which they are an inline add-on unit that can be attached to any engine. The clamped style model incorporates quick release V-band clamps with gaskets to allow easy removal of the catalytic core. Normally we recommend that you install the P-Model or F-Model diesel oxidation catalyst as close to the engine exhaust manifold outlet or turbocharger outlet as possible. The clamp-on style diesel oxidation catalyst requires exhaust heat energy to function properly therefore the closer you are to the engine exhaust manifold outlet or turbocharger outlet the better the diesel oxidation catalyst will perform. We will require your exhaust pipe outside diameter (O.D.) when you place a purchase order. All of our clamp-on style diesel oxidation catalysts are in stock and can be shipped out same day. For additional information click here.


  2. DOC Muffler:
    The full replacement diesel oxidation catalyst muffler is a "direct fit" replacement for your original equipment manufactured muffler. To install a diesel oxidation catalyst muffler remove the stock original equipment muffler and install the exhaust scrubber muffler directly in place. We will require your equipment make, model, machine serial number and the stock muffler part number when you place a purchase order. We keep a wide variety of diesel oxidation catalyst mufflers in stock for models such as Bobcat, Caterpillar, John Deere, JLG, Takeuchi and more! For additional information click here.

The Major Catalytic Oxidation Reactions which Occur are:

Carbon Monoxide: 2CO + O2 2CO2
Hydrocarbons: HC + O2 CO2 + H2O
Aldehydes: HCHO + O2 CO2 + H2O


    Our diesel oxidation catalyst design features a unique “tortuous” flowpath catalytic core, incorporating a curved mixed flow cell design. This takes advantage of the physical properties of harmful pollutants, increasing contact with the catalytic core surface. In comparison straight flowpath diesel oxidation catalyst designs allow a percentage of soluble organic particulate to flow through the catalytic core without contacting the catalyst.


    Our diesel oxidation catalyst design has a carefully distributed high quality coating of precious metals upon a uniform high porosity wash coat. The coating provides a longer reliable life and increases thermal durability of the catalyst, increasing functionality in the most adverse operating conditions. The high quality coating ensures a long and reliable operating life in the most adverse operating conditions.


    Our diesel oxidation catalyst core is made up of high strength, ultra thin metallic walls which reduce exhaust back pressure restriction to a minimum. Even under high load/speed engine operating conditions, the operating efficiency of the engine will not be affected.


    Our diesel oxidation catalyst incorporates several design features which result in excellent stability and reliability under extremely high temperatures and severe vibration. Thick foil retainer rings and folded catalytic edges improve overall structural rigidity.


    Our diesel oxidation catalyst core design will minimize the formation of accumulated particulate matter. The compact and efficient design of the diesel exhaust gas purifier allows for easy installation and service with minimal equipment downtime.
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Address:30 Intermodal Drive,
Units 19-22, Brampton,
Ontario, Canada L6T 5K1