Johnson Matthey's catalytic emissions control technologies reduce pollutants.

Carbon monoxide (CO)

Hydrocarbon (HC) & Volatile Organic Compounds (VOCs)

Nitrogen Oxides (NOx)

Nitrous Oxide (N2O)

Particulate Matter (PM)

Particulate Matter (PM) is typically associated with diesel engines but can also be emitted by industrial processes. PM is formed as a result of incomplete combustion of fuel which creates the black soot that is characteristic of diesel engine exhaust. The composition of PM is very complex. It contains solid carbon particles, adsorbed organic compounds such as formaldehyde, acrolein, benzene and other aromatics, and adsorbed sulfates and nitrates. The majority of PM is less than 1 micron in diameter [1] and can be inhaled into the lungs. PM is classified as a carcinogen. The finest particles can be the most damaging to health because they can reach the deepest regions of the lungs and are associated asthma, chronic bronchitis, and possibly lung cancer. Diesel exhaust is emitted from a wide range of diesel engines, including on-road trucks and buses as well as stationary diesel engines, locomotives, marine vessels and heavy duty mining or construction equipment.

Diesel Particulate Filters (DPFs) are very effective in capturing PM from diesel exhaust and preventing it from entering the atmosphere. Johnson Matthey has installed millions of passive DPF systems (CRT® technology) on on-road and off-road diesel vehicles and equipment, as well as stationary diesel engines which range in power from 40 kW to 4 MW. Johnson Matthey also supplies active DPF systems for construction, mining, agriculture, rail and other applications.  




Read more about the history and development of the Johnson Matthey CRT® technology at:


Formaldehyde (CH2O)

Mercury (Hg)

Methane (CH4)

Ammonia (NH3)