Johnson Matthey’s CRT® technology integrates a diesel oxidation catalyst (DOC) with a diesel particulate (DPF) filter to remove PM from diesel exhaust while simultaneously oxidizing CO and HC to CO2. The diesel oxidation catalyst converts part of the NO in the exhaust to NO2 which reacts with soot trapped in the filter preventing it from becoming plugged with soot. Combustion of soot with NO2 occurs at temperatures that are typical of most engine loads, eliminating the need for a supplemental heat source for diesel particulate filter regeneration. This is critical for systems in remote locations.
CRT® system: Filtration, Oxidation and Passive Regen
- Filtration of PM occurs in wall-flow filter
- Oxidation reactions over the diesel oxidation catalyst:
- CO + ½ O2 + CO2
- HC + O2 + CO2 + H2O
- NO + ½ O2 + NO2
- Regeneration of diesel particulate filter:
- 2NO2 + C + 2NO + CO2