Catalytic Technologies for Diesel Emission Control

Diesel engines remain a crucial component of global transport and industry, yet they emit nitrogen oxides, particulate matter and volatile organic compounds that pose significant environmental and health challenges. Catalytic technologies play a central role in mitigating these emissions through oxidation, reduction and filtration processes. Modern systems combine multiple catalytic functions—such as oxidation of carbon monoxide and hydrocarbons, selective reduction of nitrogen oxides and combustion of soot—in a single exhaust after-treatment unit. Key innovations include the development of atomically dispersed catalysts to maximise precious-metal efficiency, the design of structured supports to optimise flow and thermal stability, and the integration of advanced materials such as high-entropy oxides for durability under harsh conditions. Improvements in washcoat formulations and deposition techniques have enabled tighter control of metal loading, distribution and adhesion, leading to lower light-off temperatures and enhanced resistance to sintering. Collectively, these advances are driving next-generation diesel after-treatment systems that offer higher conversion efficiency, extended service life and reduced total cost of ownership, thus reinforcing the global transition towards cleaner mobility.

Research from Nature Portfolio

Recent studies have shown that single-atom catalysts are rapidly evolving from academic curiosities into industrially viable solutions. By anchoring isolated metal atoms—typically platinum group metals—onto robust oxide supports, researchers have achieved exceptional atom economy and high activity for diesel exhaust reactions. These materials exhibit superior resistance to sintering and maintain stable dispersion even after prolonged exposure to exhaust temperatures. Investigations into scalable synthesis methods and support engineering have demonstrated the feasibility of producing durable single-atom catalysts at commercial scales. Such breakthroughs promise to reduce the reliance on bulk precious-metal nanoparticles and to lower the overall platinum group metal content in diesel emission control systems, without compromising on conversion performance.

Catalytic Technologies for Diesel Emission Control publication trend

The graph below shows the total number of articles in catalytic technologies for diesel emission control across all publications each year (not limited to Nature Index journals).

Technical terms

Single-atom catalyst: A material in which individual metal atoms are dispersed on a support to maximise catalytic efficiency and stability.

Monolithic catalyst: A structured support, often honeycomb-shaped, coated with catalytic materials to facilitate uniform gas flow and reaction.

Diesel particulate filter (DPF): A device designed to capture and combust soot particles from diesel exhaust, often regenerated periodically.

Volatile organic compounds (VOCs): Organic chemicals that readily vaporise at engine exhaust temperatures and are oxidised to reduce emissions.

Soot: Fine carbonaceous particulate matter produced by incomplete combustion of diesel fuel, a key target for oxidation catalysts.

References

1. Single atom catalysis poised to transition from an academic curiosity to an industrially relevant technology. Nature Communications (2021).
2. Stacked Wire Mesh Monoliths for the Simultaneous Abatement of VOCs and Diesel Soot. Catalysts (2018).
3. Activity of Catalytic Ceramic Papers to Remove Soot Particles—A Study of Different Types of Soot. Catalysts (2022).
4. Platinum on High-Entropy Aluminate Spinels as Thermally Stable CO Oxidation Catalysts. Catalysts (2024).
5. Synthesis of Co,Ce Oxide Nanoparticles Using an Aerosol Method and Their Deposition on Different Structured Substrates for Catalytic Removal of Diesel Particulate Matter. Catalysts (2023).