Optimization and Performance Evaluation of Diesel Oxidation Catalysts for Methane Removal in Dual-Fuel Diesel–CNG Engines
Compressed natural gas (CNG) in dual-fuel diesel engines offers environmental benefits but significantly increases unburned methane (CH<sub>4</sub>) emissions, especially at low engine loads. This study investigates the effectiveness of different catalytic converters in methane oxidation...
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2025-04-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/18/8/1985 |
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| author | Piotr Wiśniowski Magdalena Zimakowska-Laskowska Paweł Mazuruk Sławomir Taubert Michał Stankiewicz |
| author_facet | Piotr Wiśniowski Magdalena Zimakowska-Laskowska Paweł Mazuruk Sławomir Taubert Michał Stankiewicz |
| author_sort | Piotr Wiśniowski |
| collection | DOAJ |
| description | Compressed natural gas (CNG) in dual-fuel diesel engines offers environmental benefits but significantly increases unburned methane (CH<sub>4</sub>) emissions, especially at low engine loads. This study investigates the effectiveness of different catalytic converters in methane oxidation under transient test conditions (WHTC). Three types of catalysts (Pt-, Rh-, and Pd-based) were evaluated using a combined approach of empirical engine bench tests and mathematical modelling. The results showed that, under actual exhaust gas temperature conditions, the average methane conversion efficiencies were 3.7% for Pt, 17.7% for Rh, and 31.3% for Pd catalysts. Increasing the exhaust gas temperature by 50% improved the conversion efficiencies to 7.3%, 51.8%, and 69.2%, respectively. Despite this enhancement, none of the catalysts reached the 90% efficiency threshold required to increase the CNG content of the fuel beyond 6% without exceeding emission limits. The results highlight the need for high-activity Pd-based catalysts and optimised thermal management strategies to enable the broader adoption of dual-fuel engines, while complying with Euro VI standards. |
| format | Article |
| id | doaj-art-6f7ee67d150142608ee809744f0efdf4 |
| institution | OA Journals |
| issn | 1996-1073 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | MDPI AG |
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| series | Energies |
| spelling | doaj-art-6f7ee67d150142608ee809744f0efdf42025-08-20T02:28:33ZengMDPI AGEnergies1996-10732025-04-01188198510.3390/en18081985Optimization and Performance Evaluation of Diesel Oxidation Catalysts for Methane Removal in Dual-Fuel Diesel–CNG EnginesPiotr Wiśniowski0Magdalena Zimakowska-Laskowska1Paweł Mazuruk2Sławomir Taubert3Michał Stankiewicz4Environment Protection Centre, Motor Transport Institute, 80 Jagiellońska Str., 03-301 Warsaw, PolandEnvironment Protection Centre, Motor Transport Institute, 80 Jagiellońska Str., 03-301 Warsaw, PolandEnvironment Protection Centre, Motor Transport Institute, 80 Jagiellońska Str., 03-301 Warsaw, PolandEnvironment Protection Centre, Motor Transport Institute, 80 Jagiellońska Str., 03-301 Warsaw, PolandFaculty of Mechanical Engineering, Military University of Technology, 2 gen. Sylwestra Kaliskiego Str., 00-908 Warsaw, PolandCompressed natural gas (CNG) in dual-fuel diesel engines offers environmental benefits but significantly increases unburned methane (CH<sub>4</sub>) emissions, especially at low engine loads. This study investigates the effectiveness of different catalytic converters in methane oxidation under transient test conditions (WHTC). Three types of catalysts (Pt-, Rh-, and Pd-based) were evaluated using a combined approach of empirical engine bench tests and mathematical modelling. The results showed that, under actual exhaust gas temperature conditions, the average methane conversion efficiencies were 3.7% for Pt, 17.7% for Rh, and 31.3% for Pd catalysts. Increasing the exhaust gas temperature by 50% improved the conversion efficiencies to 7.3%, 51.8%, and 69.2%, respectively. Despite this enhancement, none of the catalysts reached the 90% efficiency threshold required to increase the CNG content of the fuel beyond 6% without exceeding emission limits. The results highlight the need for high-activity Pd-based catalysts and optimised thermal management strategies to enable the broader adoption of dual-fuel engines, while complying with Euro VI standards.https://www.mdpi.com/1996-1073/18/8/1985catalytic converterCNGemissionsdual-fuel enginesmethane emissionsexhaust gas aftertreatment |
| spellingShingle | Piotr Wiśniowski Magdalena Zimakowska-Laskowska Paweł Mazuruk Sławomir Taubert Michał Stankiewicz Optimization and Performance Evaluation of Diesel Oxidation Catalysts for Methane Removal in Dual-Fuel Diesel–CNG Engines Energies catalytic converter CNG emissions dual-fuel engines methane emissions exhaust gas aftertreatment |
| title | Optimization and Performance Evaluation of Diesel Oxidation Catalysts for Methane Removal in Dual-Fuel Diesel–CNG Engines |
| title_full | Optimization and Performance Evaluation of Diesel Oxidation Catalysts for Methane Removal in Dual-Fuel Diesel–CNG Engines |
| title_fullStr | Optimization and Performance Evaluation of Diesel Oxidation Catalysts for Methane Removal in Dual-Fuel Diesel–CNG Engines |
| title_full_unstemmed | Optimization and Performance Evaluation of Diesel Oxidation Catalysts for Methane Removal in Dual-Fuel Diesel–CNG Engines |
| title_short | Optimization and Performance Evaluation of Diesel Oxidation Catalysts for Methane Removal in Dual-Fuel Diesel–CNG Engines |
| title_sort | optimization and performance evaluation of diesel oxidation catalysts for methane removal in dual fuel diesel cng engines |
| topic | catalytic converter CNG emissions dual-fuel engines methane emissions exhaust gas aftertreatment |
| url | https://www.mdpi.com/1996-1073/18/8/1985 |
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