Johnson Matthey is a leading supplier of retrofit diesel emissions control systems for non-road machinery.

Active Systems

Any application, in which it cannot be guaranteed that the exhaust gas conditions will be suitable for a passively regenerating system, will require some active regeneration. Even in these cases, it is desirable to maximise the amount of passive regeneration that can be achieved since passive regeneration is 'free', requiring no additional energy.
Almost all active filter regeneration techniques operate by raising the temperature of the filter to around 600C. This is the temperature at which the particulate (PM) collected in the filter will combust rapidly in oxygen.
Johnson Matthey can supply the following active systems:

Electrical (DPFi)

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