Construction of a Nanorod Structure‐Confined Pt@CeO₂ Catalyst by an In‐Situ Encapsulation Strategy for Low‐Temperature Catalytic Oxidation of Toluene

Abstract

In this work, Pt@CeO 2 catalysts with a nanorod structure (Pt@CeO 2 À R) and a bunch structure (Pt@CeO 2 À B) were synthesized through an in-situ encapsulation strategy of Pt species in Ce-MOFs, respectively. It was discovered that the Pt@CeO 2 À R catalyst possessed the best catalytic performance for toluene catalytic combustion, and this result was mainly caused by the confinement of Pt nanoparticles in CeÀ MOFs, which was related to the chemical state of Pt species, redox ability, and the amount of active oxygen species. The Pt@CeO 2 À R catalyst contained more Ce 3 + species, rich Pt 4 + species, and abundant active oxygen species due to the existence of the confined effect, which was conducive to promote catalytic oxidation of toluene. In addition, the Pt@CeO 2 À R catalyst also exhibited more redox ability, which may speed up the catalytic reaction rates. On the contrary, the Pt/CeO 2 À R catalyst was synthesized through a simple impregnation method and exhibited the poor activity for toluene catalytic combustion due to poor Pt 4 + species and active oxygen species. Therefore, this work provides a feasible experimental basis for the study of different morphologies and encapsulated metal nanoparticles.

A simple method for the preparation of CeO2 with high antioxidant activity and wide application range

“…To prove this, CeO 2 -Particle with similar size of 5-10 nm is synthesized and the Ce 3+ content is 30.2% (figure S7), which is also lower than that of CeO 2 -MOF. Similarly, Ma et al found the ratio of Ce 3+ in the MOF derived Pt@CeO 2 -R is higher than that of traditional supported sample [65]. In addition, Tsai prepared a broccoli-like CeO 2 from Ce-TA MOFs, which has a higher Ce 3+ content than commercial CeO 2 nanoparticle [66].…”