ACS Sustainable Chemistry & Engineering, Год журнала: 2024, Номер 12(45), С. 16524 - 16539

Опубликована: Окт. 29, 2024

An essential step in developing heterogeneous metal catalysts is to locate their active catalytic sites. In contrast large nanoparticles (NPs) and isolated single-atom (SACs), supported clusters (SMCs) possess unique electronic geometric features that contribute improved properties. this study, the loading amount of Pt was quantified as 2.5 wt %, Pt/TiO2 containing with sizes ranging from 1 4 nm were obtained order analyze influence cluster size on dehydrogenation dodecahydro-N-ethylcarbazole (12H-NECZ). The optimal performance achieved 2.5PT-6.5-3.0 (Pt-1.72) catalyst an average 1.72 ± 0.20 nm, there almost no byproducts. Besides, kinetic analysis demonstrated third net stoichiometric reaction rate-limiting step, k3 values significantly appropriate size. Furthermore, a volcano plot existed between specific activities, where Pt-1.72 occupied extreme point (4.87 molNECZ/molPt·min). Combining experimental results previous reports, it could be concluded important regulate 1–2 range, so focused explored. It revealed different caused change structures, only suitable exhibit adsorption activation capacity for reactants during 12H-NECZ dehydrogenation, achieving DFT calculations also confirmed enhanced efficiency three steps, consistent experiments.

Язык: Английский