On thermal stability and catalytic reactivity of Zr based metal organic framework (UiO 67) encapsulated Pt catalysts
Abstract Pt nanoparticles (NPs, 0.5 wt. encapsulated in a zirconium based metal organic framework (UiO 67 MOF) were synthesized via a linker design method. Thermal behavior of Pt in UiO 67 composite materials was compared with UiO 67 using thermogravimetric and differential thermal analysis (TG DTA) The results showed that Pt insertion can impair the thermal stability of bulk UiO 67, resulting in a ca. 14% drop in the critical temperature of the thermal decomposition. Temperature programmed oxidation of materials showed that calcination at 450 K was essential to provide a clean framework. Temperature programmed reduction of materials revealed that the chemisorption of H 2 on UiO 67 (at 323 K) was evidently enhanced owing to the incorporation of Pt NPs, thus making PtNP@UiO 67 suitable for hydrogenation reactions and hydrogen storage. PtNP@UiO 67 catalyst was evaluated by the oxidation and hydrogenation of 5 hydroxymethylfurfural in aqueous solutions at 363 K, showing improved activity and selectivity in hydrogenation reactions.