Johnson Matthey Technology—Advanced Catalyzed Continuously Regenerating Technology (AdvCCRT) System
This retrofit technology is included on EPA's Verified Technologies List for Clean Diesel.
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Technology specifications
| Engine Model/Application |
On-highway, 4-cycle, light-, medium-, and heavy- heavy duty diesel engines; turbo-charged or naturally aspirated, EGR and non-EGR, and originally manufactured from 2002 through 2006 model years |
|---|---|
| Retrofit Fuel, Max Sulfur | 15 parts per million (ppm) |
| Reduction in particulate matter (PM) | 90% |
| Reduction in nitrogen oxide (NOx) | n/a |
| Reduction in hydrocarbons (HC) | n/a |
| Reduction in carbon monoxide (CO) | 50% |
Criteria to achieve emission reductions
The following operating criteria must be met in order for appropriately retrofitted engines to achieve the emissions reductions above:
- The engine may or may not have a pre-existing original equipment manufacturer oxidation catalyst.
- The engine must not have a pre-existing diesel particulate filter.
- The engine must be certified at a PM emission level of at most 0.1 grams per brake horsepower-hour (g/bhp-hr).
- The engine must be electronically controlled.
- The engine should be well maintained and not consume lubricating oil at a rate greater than that specified by the engine manufacturer.
- Lube oil, or other oil, should not be mixed with the fuel.
- The engine must be operated on diesel fuel with a sulfur content of no more than 15 parts per million by weight.
- For reliable regeneration, the NOx to PM ratio, based on certified emissions levels, should be 20 or higher, and the engine cycle must be at 240° Celsius for 40% of the operation time.