DOC units oxidize hydrocarbons (HC) and carbon monoxide (CO) while helping control odor and visible emissions.

Where They’re Used

Standalone for lighter-duty applications or paired with DPF or SCR systems for more stringent regulations, including:

• Stationary power generators in urban areas

• Air quality non-attainment zones

• Industrial sites with permit limits

Benefits

• Simple, reliable design with long service life

• Strong performance in continuous or variable-load conditions

• Low maintenance requirements

When DOC is Needed

• To Meet Air Emissions Regulations: Limits on CO, HV/VOCs, diesel odor, and visible smoke.

• For Emergency or Prime Power Generators in Regulated Areas: Hospitals, data centers, airports, or sites under EPA, EU, or local environment oversight.

• Upstream of DPF: Converts NO to NO₂ for passive regeneration, reduces HC that could foul the filter, and controls exhaust temperature

• Reduce Exhaust Odor and Improve Air Quality Near People: Exhaust outlets near buildings, air intakes, or populated areas.

• For Fuel Quality or Engine Operation Issues: Low load operation, cold starts, or high HC fuel.

Typical Reductions

• CO: 80-90%

• HC/VOCs: 50-90%

• Odor: Significant

• PM (organic fraction only): 20-40%