A diesel oxidation catalyst (DOC) is a device added to the exhaust system of a tractor that reduces the amount of particulate matter (PM) emitted. The device is generally a large honeycomb structure with an active catalyst made up of a layer of precious metal. Emission reductions are approximately 20% for PM, 40% for hydrocarbons and 50% for carbon monoxide. DOC’s have a negligible impact on tractor fuel efficiency. Costs are dependent upon the size of the engine and are usually between $1000 and $2000 per unit, making them an ideal retrofit device.
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