Activity and Durability Patterns of 45 Binary Noble Metal Alloy Nanoparticle Variants for Commercial Diesel Exhaust Aftertreatment

• Published in: ChemCatChem Vol. 15; no. 19
• Main Authors: Siebeneicher, Simon, Reichenberger, Sven, Hengst, Christoph, Dornhaus, Franz, Wittek, Bernd, Barcikowski, Stephan
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 06.10.2023
• Subjects: Alloying elements; Ammonia; Bimetals; Binary alloys; Binary systems; Catalysis; Catalysts; Chemical synthesis; Durability; Enthalpy; Melting points; Nanoalloys; Nanoparticles; Noble metals; Oxidation; Oxygen; Palladium; Platinum; Precious metal alloys; Transition metals
• ISSN: 1867-3880; 1867-3899
• DOI: 10.1002/cctc.202300563

Abstract Commercial diesel oxidation catalysis mainly uses monometallic and bimetallic Pt−Pd‐based catalysts, but alloying with different elements has rarely been done systematically under industrial testing conditions. 45 binary alloys made of platinum and a selected 1 st and 2 nd ‐row transition metal, platinum group element, or coin metal were synthesized via a scalable laser synthesis method. Then, catalytic performance and durability were evaluated for one diesel oxidation and two ammonia‐slip environments. The results show the highest activity when the adsorption enthalpy of molecular oxygen of the alloy was similar to the value of Pt. Furthermore, the durability of the alloy catalysts was found to increase with the melting point of the 2 nd element Pt was alloyed with, even at molar fractions. Our results further indicate beneficial synergies beyond the binary systems underlining the possibility of further improvements by considering ternary or multinary alloys, which are accessible via laser synthesis.