Spherical Sandwich Au@Pd@UIO-67/Pt@UIO-n (n=66, 67, 69) Core-Shell Catalysts: Zr-Based Metal-Organic Frameworks for Effectively Regulating the Reverse Water-Gas Shift Reaction

In this study, spherical sandwich AupPd@UIO-67/Pt@ UIO-n (n = 66, 67, 69) core shell catalysts were assembled. Au nanoparticles (NPs) were used as the core for the epitaxial growth of Pd shells, and AupPd core shell NPs were successfully encapsulated in the center of monodispersed Au@Pd@UIO-67 nanospheres. Pt NPs were fully fixed onto the nanosphere surfaces to obtain Au@Pd@UIO-67/Pt composites; further coating with UIO-n led to Au@PdpUI0-67/Pt@ UIO-n, in which Pt NPs are sandwiched between the AupPdpUIO-67 core and the UIO-n shell. The Au@Pd core shell NPs efficiently controlled the morphology and structure of UIO-67 and enhanced the CO selectivity of the catalyst. Pt NPs increased the CO, conversion, and the UIO-n component effectively regulated the reverse water gas shift reaction.