Johnson Matthey Emission Control Technologies offers a range of emission control products for a wide range of diesel engine applications.

NOx adsorber catalyst (NAC)

NOx adsorber catalyst (NAC)

NOx can be removed from a lean gas stream by chemical adsorption onto a catalyst, hence the term NOx adsorber catalyst (NAC).

Selective Catalytic Reduction (SCR)

Selective Catalytic Reduction (SCR)

Selective catalytic reduction (SCR) systems work by chemically reducing NOx (NO and NO2) to nitrogen (N2).

Cold start catalyst (CSC)

Cold start catalyst (CSC)

A CSC catalyst which controls cold start vehicle emissions, capable of storing NOx and HC at low temperatures with very high storage efficiency and capacity, for later release and conversion is under development by Johnson Matthey.

Diesel particulate filter (DPF)

Diesel particulate filter (DPF)

A diesel particulate filter (DPF) removes particulate matter from diesel exhaust by physical filtration.

SCRT® system

SCRT® system

The SCRT® system is more than simply a combination of a CRT® system and an SCR system.

Diesel oxidation catalyst (DOC)

Diesel oxidation catalyst (DOC)

Diesel engines normally run lean (more air than fuel), and therefore a diesel autocatalyst usually operates as an oxidation catalyst (which is why it is known as a diesel oxidation catalyst or DOC) cutting CO and HC emissions by more than 90%.