Particle-size effect in catalytic oxidation over Pt nanoparticles

Авторы: Stakheev A.Yu, Bokarev D.A., Prosvirin I.P., Bukhtiyarov V.I.
Сборник: Advanced Nanomaterials for Catalysis and Energy: synthesis, characterization and application
Серия: Advanced Nanomaterials
Глава в коллективной монографии
Год издания: 2019
Издательство: ELSEVIER INC
Местоположение издательства: 525 B STREET, STE 1900, SAN DIEGO, USA, CA,92101-4495
Первая страница: 295
Последняя страница: 320
DOI: 10.1016/B978-0-12-814807-5.00008-5
Аннотация: Relationships between turnover frequency and the size of supported Pt clusters are discussed for oxidation of hydrocarbons, CO, and NO by molecular oxygen. Analysis of the experimental data indicates that TOF tends to increase for bigger platinum particles. This tendency is particularly pronounced for the nanoparticles smaller than 4–5 nm. According to the most realistic models, the observed tendency stems from the deactivation of edge, corner, and neighboring atoms by two processes: (1) strong oxygen adsorption on edge and corner atoms with high degree of coordinative unsaturation, and (2) oxidation of Pt to PtOx, which is facilitated over undercoordinated sites. As the metal clusters grow in size, the fraction of undercoordinated edge and corner atoms decreases leading to the increase in experimentally observed TOF.
Добавил в систему: Стахеев Александр Юрьевич

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