Etching of cubic Pd@Pt in UiO-66 to obtain nanocages for enhancing CO2 hydrogenation

In this study, the Zr-based metal-organic framework (MOF) catalysts [email protected], [email protected]NPs@UiO-66, and [email protected]NCs@UiO-66, were assembled. Core-shell [email protected] nanoparticles (NPs), in which cubic Pd NPs serve as the core for the epitaxial growth of Pt shells, were encapsulated into UiO-66 to obtain [email protected]NPs@UiO-66, which were subjected to further etching to obtain [email protected] nanocages (NCs) in UiO-66. CO2 conversion and CO selectivity in reverse water-gas shift reaction with [email protected]NCs@UiO-66, [email protected]NPs@UiO-66, and [email protected] were 19.6% and 72.3%, 16.2% and 85.9%, and 15.6% and 52.3%, respectively. This proves that the cubic [email protected]NCs can enhance the CO2 hydrogenation and long-term stability.