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

Catalysed Soot Filter (CSF)

As an alternative to the CRT® and CCRT® systems, it is possible in some applications to use a DPF system in which the catalyst is on the filter and no pre-catalyst is used. These systems are called catalysed soot filters (CSFs) or catalysed DPFs (CDPFs). 

The operating principle of the CSF is shown here. CSFs require higher exhaust gas temperatures for regeneration than CRT® and CCRT® systems. 

CSF system performance

The emissions reduction performance of a CSF is similar to that for a CRT® system. 

Operating conditions

CSFs require higher exhaust temperatures than CRT® systems if they are to regenerate passively. These systems will be used in special cases only, for example, when the installation space is not big enough for the CRT® and the required exhaust gas temperature is warranted >280C catalyst temperature for at least 50% of the operating time.

Diesel Particulate Filter DPF-CSF

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