Acetophenone hydrogenation and consecutive hydrogenolysis with Pd/CNT catalysts: Highlighting the synergy between single atoms and nanoparticles by kinetic modeling

Understanding the cooperative action of palladium nanoparticles (NPs) and palladium single atoms (SAs) supported on Nis essential for developing more efficient supported transition metal catalysts. In this work, the comparison of a series of Pd-catalysts on CNTs having the same palladium loading (∼1...

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Veröffentlicht in:Catalysis today 2023-10, Vol.422, p.114196, Article 114196
Hauptverfasser: Bernardin, Vincent, Vanoye, Laurent, Rivera-Cárcamo, Camila, Serp, Philippe, Favre-Réguillon, Alain, Philippe, Régis
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Sprache:eng
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Zusammenfassung:Understanding the cooperative action of palladium nanoparticles (NPs) and palladium single atoms (SAs) supported on Nis essential for developing more efficient supported transition metal catalysts. In this work, the comparison of a series of Pd-catalysts on CNTs having the same palladium loading (∼1.4 wt%) but involving different and controlled SA/NP ratios (between 2 and 200) is described. The hydrogenation of acetophenone into 1-phenylethanol and its consecutive hydrogenolysis to ethylbenzene are the chosen test reactions. Appropriate kinetic modeling of these two consecutive reactions was performed and allowed a quantitative assessment of the activity differences between catalysts as well as the demonstration of a synergy between the two palladium species (SAs and NPs). The maximum activity was clearly dependent on the distribution of the surface palladium between SAs and NPs, and interestingly, different optima for the two reactions are evidenced. This work may offer a new perspective for the design and synthesis of supported transition metal catalysts with targeted catalytic performance. [Display omitted] •A series of Pd-catalysts on CNT having the same Pd loading but different ratio of single atoms and nanoparticles is prepared.•Hydrogenation of acetophenone into phenylethanol and its consecutive hydrogenolysis to ethylbenzene is investigated.•Appropriate kinetic modelling allows demonstrating a synergy between Pd single atoms and nanoparticles.•The maximum activity is dependent on the percentage of single atoms.•The optimum single atoms to nanoparticles ratio changed for the two consecutive reactions.
ISSN:0920-5861
1873-4308
DOI:10.1016/j.cattod.2023.114196