Ideal Pt loading for a Pt/CeO2-based catalyst stabilized by a Pt–O–Ce bond
Pt–O–Ce bond formation under suitable oxidative conditions on the surface of a catalyst support inhibits Pt particle sintering and promotes the redispersion of agglomerated Pt particles. In the present study the influence of Pt loading on changes in the catalytic activity and Pt particle size was evaluated for aged and regenerated Pt/CeO2-based catalysts. Catalysts with a lower Pt loading exhibited less catalytic deactivation and Pt sintering. There was an ideal Pt loading for which regeneration restored the Pt particle size and the catalytic activity to the same values as for the fresh state. This ideal Pt loading is discussed in terms of Pt anchor sites by considering the structure and composition around Pt on a CeO2-based catalyst.
Graphical abstractThe experimental ideal Pt load for Pt/CeO2-based catalysts is discussed in terms of Pt anchor sites based on the structure and composition of the Pt neighborhood on the support.Figure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights▶ Structure of Pt–O–Ce anchor site was simulated using DFT. ▶ 5 Ce atoms interact with one Pt atom to form a Pt anchor site. ▶ The experimental ideal Pt loading was same with simulated one.
Journal: Applied Catalysis B: Environmental - Volume 99, Issues 1–2, 31 August 2010, Pages 336–342