SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 29: Supported Nanoclusters: Structure, Reactions and Catalysis
O 29.1: Vortrag
Dienstag, 28. März 2023, 10:30–10:45, CHE 91
There is life after coking for Ir nanocatalyst superlattices — •Antonio J Martínez-Galera1,2, Haojie Guo3, Mariano D Jiménez-Sánchez3, Stefano Franchi4, Kevin C Prince4, and José M Gómez-Rodríguez2,3,5 — 1Departamento de Física de Materiales, Universidad Autónoma de Madrid, E-28049 Madrid, Spain — 2Instituto Nicolás Cabrera, Universidad Autónoma de Madrid, E-28049 Madrid, Spain — 3Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, E-28049 Madrid, Spain — 4Elettra-Sincrotrone Trieste S.C.p.A., in Area Science Park, 34149 Basovizza (Trieste), Italy — 5Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, E-28049 Madrid, Spain
Achieving superior performance of nanoparticle systems is a major challenge in catalysis. Two main phenomena, occurring during the reactions, hinder the development of the full potential of nanoparticle catalysts: sintering and contamination with carbon containing species, sometimes called coking. Here, we show that Ir nanocrystals, periodically arranged on h-BN supports, can be restored without sintering after contamination by persistent carbon. This restoration yields the complete removal of carbon from the nanocrystals, which keep their crystalline structure, allowing operation without degradation. These findings, together with the possibility of fine tuning the nanocrystals size, confer this nanoparticle system a great potential as a testbed to extract key information about catalysis-mediated oxidation reactions. For the case of the CO oxidation by O2, the existence of chemical processes not observed before in other nanoparticle systems is proven.