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27 Products found


Johnson Matthey - 2-way (Oxidation) Catalysts

In most gas streams, carbon monoxide (CO) and hydrocarbons (HC) can be removed by combination with oxygen (O2) using an oxidation catalyst (also known as a 2-way catalyst): CO + ½ O2 → CO2, [HC] + O2 → CO2 + H2O. This reaction is suitable for oxygen-rich (“lean”) gas streams, typical of diesel exhaust and many industrial process emissions. Many diesel particulate filter systems incorporate an oxidation catalyst, either as...

Johnson Matthey - 3-Way (NSCR) Catalysts

Three-way catalysts (sometimes known as non-selective catalytic reduction, or NSCR, catalysts) are designed to simultaneously convert three pollutants to harmless emissions: Carbon Monoxide (CO) → Carbon Dioxide (CO2), Hydrocarbons (HC) → Water (H20), Oxides of Nitrogen (NOx) → Nitrogen (N2).

Johnson Matthey - Ammonia-SCR Systems

Johnson Matthey can offer coated and extruded catalysts.

Johnson Matthey - Hydrocarbon-SCR Systems

Hydrocarbon-SCR (lean NOx reduction) systems use hydrocarbons as the reductant. The hydrocarbon may be that occurring in the exhaust gas ('native') or it may be added to the exhaust gas. This has the advantage that no additional reductant source (e.g. urea) need be carried but these systems cannot offer the performance of ammonia-SCR systems.

Johnson Matthey - NOx Adsorber Catalysts

NOx can be removed from a lean gas stream by chemical adsorption onto a catalyst, hence the term NOx adsorber catalyst (NAC). The process of adsorption releases CO2.

Filter Regeneration

Any filter has a finite capacity. Diesel particulate filters must be cleaned out, intermittently or continuously, if they are not to block. This is most important, since an overfilled filter can damage the engine through excessive exhaust back pressure and can itself be damaged or destroyed.

The CRT System

The CRT system is the most widely used DPF system in the world and is a patented Johnson Matthey technology. It comprises an oxidation catalyst followed by a DPF. The principle of its operation is shown below.

The CCRT System

The CCRT system is a CRT system, but with a catalytic coating also applied to the DPF.

Catalysed Soot Filter (CSF)

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

NO2 from Passive Filters

Nitrogen Dioxide (NO2) Emissions. Diesel engines emit oxides of nitrogen (NOx), consisting of nitrogen oxide (NO) and nitrogen dioxide (NO2). The percentage of each does vary, but typically NO2 might make up 10% of the total NOx coming out of the engine. Reports have linked continuously regenerating filter systems to increased emissions of NO2 from the tailpipe. These do not always contain sufficient information to enable the reader to make an...

Active Systems - Active DPF Regeneration

Active DPF Regeneration. Any application in which it cannot be guaranteed that the exhaust gas conditions will be suitable for a passively regenerating system will require some active regeneration. Even in these cases, it is desirable to maximise the amount of passive regeneration that can be achieved since passive regeneration is 'free', requiring no additional energy.

The SCRT System

The SCRT system is more than simply a combination of a CRT system and an SCR system. In this integrated design, the CRT performs two functions: it gives excellent conversion of CO, HC and PM, and it enhances the NO2 content of the gasses that pass into the SCR system. By optimising the gas mix supplied to the SCR catalysts in this way, excellent NOx conversions are also achieved.

NOx Adsorber Catalyst And A Diesel Particulate Filter (NAC - DPF)

A NOx adsorber catalyst and a diesel particulate filter may be used together to give effective removal of CO, HC, PM and NOx from a diesel exhaust. Different system configurations using the two technologies have been developed by Johnson Matthey to achieve a suitable balance between performance, durability and size.


Johnson Matthey - Cars, Vans and Light Trucks

More than 90% of new passenger vehicles are now fitted with autocatalysts, one third of which have been supplied by Johnson Matthey.

2 and 3-wheel Vehicles

Motorcycles and 3-wheel vehicles. With catalyst forcing legislation now affecting many of the worlds motorcycle markets, Johnson Matthey is ideally placed to supply the catalysts. JM recognises the value of working with our customers to produce the best overall catalyst and vehicle configuration.

Trucks & Buses

Johnson Matthey offers products and technologies for the reduction of emissions from trucks and buses. We provide catalyst and systems technology to engine and vehicle OEMs. We also offer a range of retrofit solutions for the owners and operators of vehicles already in service.

Products and services for Truck and Bus OEMs

Johnson Matthey has decades of experience of working with vehicle and engine manufactures to meet ever more stringent emissions standards. In the field of trucks and buses, this experience is complemented by leading technologies proven over many years in the market.

Mining Non-Road Mobile Machinery

Dealing with diesel emissions at source. Diesel engines are a valuable power source for underground mining but their emissions can be a disadvantage. These emissions are best dealt with at source through the use of exhaust treatment. The need to reduce particulate engines from mining machines is most pressing, driven by new regulations and an increasing understanding of detrimental health effects of exposure to fine particles.

Locomotive-Rail Applications

Maintaining the environmental advantages of rail transport. Regulations covering the emissions from diesel engines in locomotives have not kept pace with the emission limits placed on heavy duty trucks, buses and non-road equipment. However, the US EPA has recently issued New Source Performance Standards (NSPS) for Tier 4 line haul and switcher locomotives. In order to meet these stringent Tier 4 NOx and PM limits, a variety of technologies including...


Growing concern over the environmental impact of shipping has forced local, regional and global action, requiring reductions in emissions such as Nitrogen Oxides (NOx), Sulphur Oxides (SOx), Volatile Organic Compounds (VOCs) and Particulate Matter (PM).

Gas Turbines

Johnson Matthey provides complete NOx and CO emission control systems for simple cycle gas turbines, from the gas turbine outlet through the stack. Our systems offer high availability and efficiency, while meeting all of today's stringent emission control standards. We also work with major leading HRSG manufacturers to provide complete solutions for combined cycle applications.

Small Utility Engines

Johnson Matthey is one of the first companies to provide catalysts for 'green' lawnmowers in Europe and for propane powered floor care equipment in the US. Johnson Matthey provides a complete line of catalysts for both handheld and non-handheld utility engines under 37kW (50hp). Catalyst can be supplied on either ceramic or metal substrates for either rich-burn or lean-burn engines.

Contract Testing

Johnson Matthey Testing, designed to be one of the most advanced testing centres in the industry, is a full service supplier, located in Taylor, Michigan, USA.

Piezo Products

Piezoelectric ceramics, piezo components and piezo modules have been developed, produced and sold in Redwitz, Germany for the past 30 years. More than 100 million piezo products have been sold to different markets worldwide.

Lean Burn Engines

Our honeycomb and plate designed catalysts modules are the center of the SINOx Clean Air Systems for stationary engines. NOx reductions of up to 97% have been realized. Our worldwide experience is with over 400 installed SCR systems for stationary engines with varying fuel combinations. Since 1995 the SINOx System has been represented in the exhaust gas cleaning area reliable and flexible partner through our own catalyst and component production line....


Do You Have the Right Catalyst to Meet the EPA’s NESHAPS for Your Gas Compressor Engines

Chemical Plants & Industrial Processes

Any chemical and industrial processes involving a combustion step will form undesirable by-products requiring specialist emissions control. Carbon monoxide (CO), oxides of nitrogen (NOx) unburned hydrocarbons (HC) and specific categories of air toxics such as volatile organic compounds (VOC), halogenated VOC (HVOC), hazardous air pollutants (HAP) and other malodorous substances can be vented or discharged from a wide range of processes and the type...

27 Products found
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