The Eminox CRT® system uses a patented process that functions on the basis that soot will begin to oxidise in the presence of NO2 at around 250°C, compared to 600°C with oxygen. This lower temperature is compatible with the typical exhaust temperature of diesel engines.
The CRT® system is made up of two chambers, a highly active platinum oxidation catalyst followed by an extremely fine ceramic wall-flow filter.
As the dirty exhaust gas enters the first chamber, it hits a diffuser plate which distributes the gas evenly through the catalyst. The platinum oxidation catalyst oxidises the CO and HC into CO2 and H2O, virtually eliminating them from the exhaust gas. It also oxidises some of the NO to NO2. This is the key to the removal of soot collected by the CRT® filter.
CO + ½O2 -> CO2
[HC] + O2 -> CO2 + H2O
NO + ½O2 -> NO2
The wall-flow filter in the second chamber traps the particulate matter in the exhaust gas. This trapped soot is continually oxidised by the NO2, removing it from the exhaust gas.
[C]+ 2NO2 -> CO2 + 2NO
The Eminox CRT® system gives outstanding performance, eliminating over 90% of all particulate matter, hydrocarbons and carbon monoxide. NOX reductions, while not guaranteed, are typically in the 5 - 10% range.
In demanding applications a catalytic coating can also be applied to the filter itself. This is called a CCRT® – Catalysed Continuously Regenerating Trap. This enables the CRT® to cover a wider range of operating conditions, with lower exhaust temperatures or NOX:PM ratio.
In the CCRT®, after the NO2 has reacted with the soot trapped in the filter, producing NO and CO2, some of the NO is re-oxidised to NO2 which then reacts with any soot remaining in the filter.
Soot in the filter reacts with the NO2:
[C]+ 2NO2 -> CO2 + 2NO
Some the NO produced in the reaction is re-oxidised into NO2:
NO + ½O2 -> NO2
The NO2 reacts with any remaining particulate removing it from
the exhaust gas:
[C]+ 2NO2 -> CO2 + 2NO
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