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The DOC emissions control devices are made for a specific purpose. This is to reduce the amount of diesel pollutants that are released into the atmosphere by diesel powered vehicles.

DOC is an acronym for Diesel Oxidation Catalyst and is the mechanism in which the toxic pollutants are chemically altered so their removal as less harmful substances is made possible from the gases and particulate matter of the exhaust fumes.

The chemical mechanism that alters the components of the diesel exhaust is a combination of the catalyst and the heat being generated by the diesel engine itself. Without the heat, this mechanism would be less efficient but still would occur.

The DOC is placed into action by being coated in the (DPF) diesel particulate filer and or the Purimuffler in the exhaust system of the diesel powered vehicle. The honeycomb design of these devices allow for maximum surface area to come in direct contact with the gases so an efficient means of conversion will result.

The success rate of this pollution control device is between 80%and 100% of the particulate matter when both the DPF and the Purimuffler are used together.

The gases that are oxidized are carbon monoxide, nitrous oxides and hydrocarbons. The resulting chemical change produces carbon dioxide and water that is less harmful to the environmental. This process has its best results when a low sulfur fuel is being consumed by the diesel engine, but will still occur when the sulfur levels are elevated.

Because of the chemical reaction within these pollutant control devices, there is a gradual build up of material. This material does have to be periodically removed so the flow of the gases is not impeded. Depending on the use and load placed on the engine this period could be as often as every 6 months or up to 4 years.

Once the solid material is removed, the pollution control device will work as efficiently as when it was first installed. The DOC that covers the interior of these devices does not wear out or have a reduction in capacity to perform its primary function of oxidizing the exhaust gases and particulate matter.

This pollution reduction system is verified by CARB and approved by the EPA for use in all diesel powered vehicles. This includes school buses, over the road tractor trailers, off road construction equipment, personal vehicles and rail road engines to name a few.

The DOC emissions devices can help any fleet owner or person who wishes to reduce the amount of toxic emissions from leaving the tail pipe of the diesel powered vehicles in a verified and positive manner.

Related articles

• Your Diesel Emmission Filter (epaemissions.com)
• Truck Exhaust Filter (epaemissions.com)
• Purimuffler Exhaust System (epaemissions.com)