Oxidation catalysts (2-way)

Johnson Matthey oxidation catalysts are used to prevent air pollution from almost all industrial and combustion sources.

Johnson Matthey’s oxidation catalyst portfolio contains both precious metal and base metal oxidation catalysts coated on metallic and ceramic substrates to control air pollution from a wide range of stationary sources. One family of oxidation catalysts is designed to control CO, VOCs, HAPs and hydrocarbon emissions from combustion sources such as stationary diesel engines and gas engines. More specialised catalysts were developed to treat emissions from chemical manufacturing processes. Most of our oxidation catalysts are available in multiple shapes and sizes to fit into new and existing catalytic converter housings. Catalysts are manufactured in a wide range of cell densities to satisfy conversion and backpressure requirements. Many oxidation catalyst formulations can be washed to remove contaminants and extend catalyst lifetime. And spent catalysts containing Platinum Group Metal (PGM) can be returned to Johnson Matthey for PGM refining in exchange for credit towards future purchases.

There is a Johnson Matthey oxidation catalyst to prevent air pollution from almost every stationary source of exhaust emissions:


Diesel Oxidation Catalysts (DOCs): multiple formulations treat diesel engine exhaust emissions containing CO, VOCs, particulate mass (PM) and the soluble organic fraction (SOF) of PM. Performance features include:

  • High conversions of CO, VOCs, SOF
  • Low SO3-make formulations
  • Low NO oxidation formulation
  • PM reduction

Natural Gas Engine Oxidation Catalysts: treat emissions from lean-burn natural gas engine containing CO, VOCs, NMHCs (ethane, propane), HAPs. JM also supplies three-way catalyst for rich-burn gas engines.

Methane Oxidation Catalyst: for methane slip from natural gas engine combustion.

Oxidation Catalyst for Biogas Engines: reduce CO, formaldehyde, VOCs from biogas-fueled engines that run on landfill gas, digester gas.

Gas Turbines

Gas Turbine Oxidation Catalysts:
achieve high reduction of CO, VOCs and formaldehyde with minimum NO2 formation from simple-cycle and combined-cycle gas turbines. The high activity formulation is coupled with optimised metal monolith design to deliver high conversions at low backpressure with a small catalyst package. We offer multiple oxidation catalysts for gas turbines including a high-temperature formulation and a low-temperature poison-resistant formulation. 


Chemical and Manufacturing Processes

PTA Emission Control Catalysts: 
special halogen-tolerant formulations treat the emissions from the manufacture of Purified Terepthalic Acid (PTA). PTA offgas contains many hazardous compounds including methyl bromide, CO, benzene and other aromatics, acetic acid, acetates, formats, alcohols and other VOCs. We offer multiple formulations to accommodate variations in PTA plant operating conditions and exhaust gas compositions, including our Halocat SC29 advanced base-metal oxidation catalyst which controls emissions at a much lower cost than precious metal catalysts.

Chemical and Manufacturing Processes: multiple catalyst formulations treat emissions from chemical process that contain CO, VOCs, acids and halogenated hydrocarbons.

General Applications:
Johnson Matthey Standard VOC Catalysts treat typical VOCs, HAPs, halogenated hydrocarbons, CO and malodorous compounds that are emitted from coated processes, printing and solvent-based processes, chemical and petrochemical processes, soil remediation and hazardous waste sites and commercial and industrial processes such as coffee roasting, bakeries and food processing. We offer our standard VOC catalysts on ceramic and metallic substrates at different cell densities to achieve maximum conversions at many different exhaust gas conditions.


Johnson Matthey benefits from more than 50 years of research and development for the automotive and heavy-duty diesel industries. Today, our engineers collaborate with customers to design catalytic emission control solutions tailored to meet their specific requirements. Oxidation catalysts are coated on metallic and ceramic substrates, depending on the application. In general, metallic substrates offer lower backpressure and ceramic substrates are more resistant to harsh chemical environments. Both types of substrate come in many sizes, shapes and cell densities. Our oxidation catalysts are manufactured in standard dimensions as well as customised sizes to fit existing housings. Johnson Matthey’s oxidation catalysts prevent air pollution and enable our customers to remain compliant with clean air regulations in Europe, the United States and around the world.

General enquiries

Joseph McCarney


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    Betty Ann Keen

    North America

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