4-way Diesel Systems
Integrated systems for CO, HC, PM and NOx control from diesel engines
The most effective 4-way systems are those that successfully integrate two components, in which they work together rather than as two separate systems. Such systems are usually built from:
a diesel particulate filter such as a CRT® system, incorporating an oxidation catalyst, to control CO, HC and PM, and
a NOx control catalyst, either SCR or NAC.
There are two main categories of integrated 4-way system, defined by the NOx reduction system that they employ: SCRT® systems and NAC + DPF systems.
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