The CCRT System

The oxidation catalyst removes CO and HC and oxidises some of the NO in the exhaust gasses to NO2. This NO2 then reacts with the PM trapped in the filter, producing NO and CO₂. Some of the NO is then reoxidised to NO₂ in the filter, which then reacts with more trapped PM. This enables the system to regenerate in applications with very low exhaust gas temperatures or low Nox:PM ratios in the exhaust gases.

CCRT system performance
The emissions reduction performance of a CCRT system is the same as or even slightly better than a CRT system. Its major advantage is in its wider range of operating conditions.

Operating conditions
The CCRT system offers all the advantages of a CRT system but is able to operate in applications that have exhaust temperatures too low for a CRT system. It has been verified by the US EPA for applications that have temperatures >210°C for 40% of the operating time. It is also able to operate on engines with a NOx:PM ratio that is insufficient for a standard CRT system.