D-Series (Ceramic DOC)

The Nett D-Series (Ceramic) Diesel Oxidation Catalyst (DOC) is a maintenance-free emission control converter for diesel engines, using ceramic substrates with zeolite-based hydrocarbon traps to extend catalyst performance into the low-temperature range. Applications include off-road, on-road, power generation, marine, gantry crane and locomotive engines.

Technology

• Round cordierite substrates with square cell geometry
• Tourniquet packaging technology in a steel container for rugged, durable converters
• Typically sized larger than M-Series DOCs to provide sufficient HC trap volume, giving comparable pressure losses
• Housings in aluminised and stainless steels

Performance

• 40-50% HC conversion and diesel odour control at very low exhaust temperatures (HC trap capacity for a maximum of 15-30 minutes of continuous low-temperature operation)
• Minimum about 180°C (360°F) required for conversion; CO conversion exceeds 90% above 250-300°C (480-570°F)
• Particulate matter reductions of 30-50%
• Prolonged exposure above 650°C (1200°F) may cause thermal degradation; avoid phosphorus, zinc, heavy metals, lead, arsenic, vanadium and silicone

Configurations

• Universal-fit converters, welded (compact) or clamped (removable centre-body for inspection and cleaning)
• Direct-fit catalytic mufflers replacing the OEM muffler (database of over 10000 designs), matching or exceeding original sound attenuation and back pressure
• Options: add-on mufflers, custom heat-insulative blankets, OEM developments