Johnson Matthey products

Johnson Matthey’s diesel oxidation catalyst (DOC) technology can cut CO and HC emissions by more than 90%. Our DOCs are designed to oxidise pollutants in light and heavy duty engines. Carbon monoxide (CO), hydrocarbon (HC) and nitrogen oxide (NO) are oxidised to carbon dioxide (CO₂), water (H₂O) and nitrogen dioxide (NO₂).

Remove over 99% of particulate matter. Have high performance at low precious metal loadings and low back pressure. Are optimised for specific systems and are durable against temperatures and poisons. Oxidise NO to provide favourable NO:NO₂ ratios for passive filter regeneration and for downstream catalyst reactions. Can be coated onto a range of different filter substrate types.

Selective catalytic reduction (SCR) systems work by chemically reducing NO_x (NO and NO₂) to nitrogen (N₂). Johnson Matthey offers coated and extruded catalysts.

Johnson Matthey’s SCRF system integrates selective catalytic reduction (SCR) technology coated on a diesel particulate filter (DPF). SCRF plays a key role in modern diesel after-treatment systems to control both oxides of nitrogen (NO_x) and particulate matter (PM) emissions.

Johnson Matthey’s ASC technology removes residual ammonia (NH₃) from upstream ammonia dosing systems, converting it into nitrogen (N₂) and water (H₂O).

Gasoline fuelled vehicles utilise a three-way catalyst that can reduce carbon monoxide (CO), hydrocarbon (HC) and oxides of nitrogen (NO_x) emissions by over 99%  –  if the air-to-fuel ratio (AFR) is accurately controlled. Optimised conversion is achieved with an AFR of 14.7:1. 

A Three Way Filter (TWF^®) is a gasoline particulate filter (GPF) with a JM catalyst coating. Gasoline vehicles fitted with Johnson Matthey TWF technology can reduce particle numbers by up to 99%.

Johnson Matthey recognises that today’s chemical industry can be fast moving and highly tailored to customer demands. We deliver this service through our custom catalyst programmes.