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XAS and XRD analysis of active Pt and Pd sites in metal–organic framework UiO-67

This investigation is devoted to metal-organic frameworks (MOFs) with UiO-67 topology, the materials with a three-dimensional porous structure and high surface area. Due to the diversity of species, MOFs are used in such areas as luminescent sensors, catalysts, filters, storage and transportation of light gases, and many others [1]. Using noble metals to functionalize metal-organic frameworks is a promising way for constructing new materials for catalytic applications [2, 3]. Although numerous successful synthesis of MOFs functionalized by metal ions and metal nanoparticles were reported, the exact mechanisms of structural evolution of the metal sites in many cases are still unknown. Determination of these mechanisms as well as investigation of the intermediate active sites formed during the synthesis is important for tailoring the specific catalytic properties of materials. In this work, we investigate structural changes in UiO-67 functionalized by Pd and Pt depending on the activation conditions by a combination of theoretical and experimental techniques.