Nett emission control
Diesel Oxidation Catalysts
Simple, maintenance-free catalytic converters for diesel engines. They cut carbon monoxide and hydrocarbons, and the soluble part of diesel particulate – usually built into a muffler that replaces the original.
- over 90%CO removed above 250–300 °C
- 30 – 50%particulate reduction
- from 180 °Cto start working
- 10,000+direct-fit designs
The range
M-Series and D-Series
M-Series Metallic
Stainless-steel foil substrate with a herringbone pattern that keeps the gas mixing for higher conversion.
- Universal or direct fit
- EPA verified for stationary engines
D-Series Ceramic
Ceramic substrate with zeolites, made to keep working at lower exhaust temperatures.
- Universal or direct fit
- For cooler-running engines
Substrates Compared
Uncoated monolith properties: metallic supports have much thinner walls and a larger open area.
| Property | Metallic | Ceramic |
|---|---|---|
| Cell density, cpsi | 160 / 240 / 320 | 200 / 300 / 400 |
| Wall thickness, mm | 0.05 | 0.30 / 0.21 / 0.18 |
| Surface area, cm²/cm³ | 19 / 23 / 26 | 18.5 / 23.6 / 27.2 |
| Open frontal area, % | 94 / 92 / 91 | 69 / 74 / 74 |
Why a Nett DOC
Fit It and Forget It
Maintenance-Free
No moving parts and nothing to service – designed to last the life of the engine.
Direct Fit
Built into a catalytic muffler that matches or beats the original for noise and back pressure.
Universal Too
Welded (compact) or clamped (easy to inspect) universal converters for any application.
Corrosion Resistant
Aluminised and stainless steel throughout.
How to choose
Getting the Best from a DOC
Size to the Engine
The catalyst is chosen by engine size; send us the make, model and power.
Mind the Oil
Phosphorus, zinc and other oil additives poison catalysts – keep oil consumption low and use low-phosphorus oils.
Avoid Overheating
Prolonged temperatures above 650 °C (for example from leaking injectors) damage the catalyst.
Need Soot Gone Too?
A DOC removes only part of the particulate – a diesel particulate filter removes over 90%.
Literature & related
More Information
- Nett catalytic mufflers
How 3-way catalytic mufflers and A/F control work · PDF, 374 KB
Not Sure Which One You Need?
Tell us about the job – the machine, the conditions and what it has to do – and we’ll help you choose the right Nett Technologies product.