Diesel Particulate Filter Technology and Emission Control
Summary
Diesel particulate filters (DPFs) are porous wall-flow monoliths installed in exhaust systems to intercept and retain soot and fine particles generated during fuel combustion. As exhaust gases traverse the filter walls, particulate matter accumulates to form a porous cake that enhances capture efficiency but increases backpressure. To restore permeability, DPFs undergo regeneration—either passively through continuous catalytic oxidation at elevated exhaust temperatures or actively via fuel post-injection, electrical heating or intake of secondary oxidants. Catalyst washcoats, typically comprising platinum, palladium or metal oxides, are applied to reduce the temperature required for soot ignition and promote simultaneous filtration and oxidation. Key challenges include ash accumulation from lubricant-derived inorganic constituents, uneven catalyst distribution, thermal stress during regeneration cycles and the trade-off between filtration efficiency and pressure drop. Advances in substrate design, catalyst formulation and washcoat techniques have improved durability, reduced regeneration frequency and minimised fuel penalty. Mathematical modelling and in situ imaging have deepened insight into deposit formation, flow distribution and reaction kinetics, guiding the optimisation of DPF architectures that meet stringent global particulate-number and mass regulations and contribute to cleaner diesel mobility.
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Diesel Particulate Filter Technology and Emission Control publication trend
The graph below shows the total number of articles in diesel particulate filter technology and emission control across all publications each year (not limited to Nature Index journals).
Technical terms
Diesel particulate filter (DPF): A porous wall-flow monolith that captures soot particles by forcing exhaust gases through ceramic channel walls.
Regeneration: The process of oxidising accumulated soot within the filter to restore permeability and control backpressure.
Soot oxidation: Catalytic or thermal conversion of carbonaceous particulates into gaseous products, primarily carbon dioxide.
Washcoat: A catalyst-bearing porous layer applied to filter channels to promote soot combustion at lower temperatures.
Backpressure: The pressure differential across the filter caused by particulate accumulation, which affects engine performance and fuel consumption.
References
- Modelling treatment of deposits in particulate filters for internal combustion emissions. Progress in Energy and Combustion Science (2023).
- The Issue of Soot-Catalyst Contact in Regeneration of Catalytic Diesel Particulate Filters: A Critical Review. Catalysts (2020).
- Thermogravimetric analysis of soot combustion in the presence of ash and soluble organic fraction. RSC Advances (2020).
- Washcoating of catalytic particulate filters studied by time-resolved X–ray tomography. Chemical Engineering Journal (2021).
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