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Article

Investigation on the Role of Pd, Pt, Rh in Methane Abatement for Heavy Duty Applications

1
Swiss Federal Laboratories for Materials Science and Technology (EMPA), Automotive Powertrain Technologies Laboratory, CH-8600 Dübendorf, Switzerland
2
École Polytechnique Fédérale de Lausanne (EPFL), Institute of Chemical Sciences and Engineering, CH-1015 Lausanne, Switzerland
3
Paul Scherrer Institut, Forschungsstrasse 111, CH-5232 Villigen, Switzerland
*
Author to whom correspondence should be addressed.
Present address: Department of Chemical and Biological Engineering, Friedrich-Alexander University Erlangen-Nürnberg (FAU), 91058 Erlangen, Germany.
Academic Editors: Anil Banerjee, Hongxing Dai, Junhu Wang and Patrick Da Costa
Catalysts 2022, 12(4), 373; https://doi.org/10.3390/catal12040373
Received: 25 February 2022 / Revised: 22 March 2022 / Accepted: 23 March 2022 / Published: 25 March 2022
(This article belongs to the Special Issue Advances in Catalytic Oxidation of Methane and Carbon Monoxide)
Methane abatement remains a challenge in aftertreatment systems of natural gas engines, currently under discussion in combination with synthetic methane. In this study, Pt/Rh and Pd/Rh-based three-way catalysts are investigated under various transient conditions because transients between O2 excess (lean) and O2-poor (rich) conditions can significantly enhance methane abatement. At mid to high temperatures, transitions from rich to lean feed yield higher rates of methane direct oxidation under lean conditions with the Pt/Rh catalyst, compared to the Pd/Rh catalyst. Both catalysts are able to trigger methane steam reforming (SR) after transitions from lean to rich feed. The SR reaction leads to increased H2 and NH3 formation. However, SR deactivates much faster in the Pt/Rh catalyst. At low temperature, the Pt/Rh catalyst is more active for SR. Results from an additional Pd-only catalyst confirm that Rh is essential for NOx conversion and high N2 selectivity. The distinct characteristics of Pt, Pd and Rh demonstrate the benefits obtained from the combination of the three platinum group metals. The potential of the Pt/Pd/Rh catalyst is proved to be significant throughout the complete engine map. Under optimized lean/rich oscillatory conditions, the Pt/Pd/Rh catalyst yields more than 95% methane conversion under almost all conditions while maintaining efficient abatement of all other pollutants. View Full-Text
Keywords: palladium; platinum; rhodium; catalytic methane oxidation; steam reforming; lean/rich oscillations; ammonia formation palladium; platinum; rhodium; catalytic methane oxidation; steam reforming; lean/rich oscillations; ammonia formation
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MDPI and ACS Style

Wang, M.; Dimopoulos Eggenschwiler, P.; Franken, T.; Agote-Arán, M.; Ferri, D.; Kröcher, O. Investigation on the Role of Pd, Pt, Rh in Methane Abatement for Heavy Duty Applications. Catalysts 2022, 12, 373. https://doi.org/10.3390/catal12040373

AMA Style

Wang M, Dimopoulos Eggenschwiler P, Franken T, Agote-Arán M, Ferri D, Kröcher O. Investigation on the Role of Pd, Pt, Rh in Methane Abatement for Heavy Duty Applications. Catalysts. 2022; 12(4):373. https://doi.org/10.3390/catal12040373

Chicago/Turabian Style

Wang, Moyu, Panayotis Dimopoulos Eggenschwiler, Tanja Franken, Miren Agote-Arán, Davide Ferri, and Oliver Kröcher. 2022. "Investigation on the Role of Pd, Pt, Rh in Methane Abatement for Heavy Duty Applications" Catalysts 12, no. 4: 373. https://doi.org/10.3390/catal12040373

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