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. (C) 2010 Elsevier B.V. All rights reserved.