Year: 2025
Type: article
Abstract: Nanoparticle‐supported Pt and Pd catalysts are employed industrially to convert CO and hydrocarbon residue from incomplete diesel fuel combustion into more environmentally‐benign products. However, these catalysts deactivate over time due to sintering, especially for Pt nanoparticles which readily generate volatile species under high operating temperatures. Here, we turned the detrimental vapor‐mediated sintering of Pt into an advantage by using a physical mixture of Pt and Pd catalysts prepared using a raspberry‐colloid‐templating (RCT) method. The RCT method produced Pt/Al 2 O 3 and Pd/Al 2 O 3 catalysts with partially embedded NPs to inhibit surface‐mediated sintering pathways. As validated using an industry‐defined emission control test protocol, aging a physical mixture of Pt/Al 2 O 3 and Pd/Al 2 O 3 at high temperature produced an alloyed PtPd/Al 2 O 3 catalyst that outperformed the fresh catalyst mixture and both individual catalysts for hydrocarbon conversion, while exhibiting high catalytic stability and resistance to sintering and to SO 2 poisoning. X‐ray photoelectron spectroscopy revealed that in the aged catalyst mixture, half of the Pd content existed in the more active metallic state, compared to the less active oxide forms in the fresh mixture and both individual catalysts, explaining the unusual activity enhancement. Our results represent a practical approach to producing active and stable PtPd/Al 2 O 3 diesel oxidation catalysts for emission control applications.
Source: ChemSusChem
Institutions: Harvard University, Oak Ridge National Laboratory
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
Funders: National Science Foundation, U.S. Department of Energy, Battelle, UT-Battelle, Agency for Science, Technology and Research, Defense Threat Reduction Agency, Office of Science, Office of Energy Efficiency and Renewable Energy, Division of Electrical, Communications and Cyber Systems, Basic Energy Sciences, Office of Energy Efficiency, Oak Ridge National Laboratory
Awards: G1019100964, G1026679911, G1122898986, G121915436, G1334272675, G1521952760, G1565419222, G1645119126, G166562317, G203625172, G2135731044, G2411683797, G2988778103, G313676650, INTEGRATED MESOSCALE ARCHITECTURES FOR SUSTAINABLE CATALYSIS (IMASC), G4423657506, G5726405315, NNCI: The Center for Nanoscale System (CNS) at Harvard University, G675320460, G7059269309, G807938293, G8269158468, INTEGRATED MESOSCALE ARCHITECTURES FOR SUSTAINABLE CATALYSIS (IMASC), G8906985441, G8925520787, G8943143067
OpenAlex ID: W4408070319