Green and high yield synthesis bimetallic zeolitic imidazole framework-67 for efficient catalytic CO2 cycloaddition

Metal-organic frameworks (MOFs) with ZIF-67 have been widely studied. Incorporating multi-bimetals into ZIF-67 offers a strategic approach to leverage unique properties and address the limitations of traditional single-metal in ZIF-67. An environmentally friendly solid-state thermal (SST) method to simultaneously incorporate heterometals (Cu, Fe, Ru, Pd, Mn, and Ni) into the ZIF structure, referred to as M@ZIF-67, is developed. The synthesis occurs in a single step, utilizing thermally-treated mixed solid precursors of multi-bimetals and imidazole ligands without additional agents or solvents, which is the innovative green route to approach multi-bimetals ZIFs. Multiple techniques confirm that heterometals are homogeneous, uniform, and precised metal content in the iso-structure of ZIF-67. Interestingly, synthesizing M@ZIF-67 through the SST method achieves a scalable and high yield. Furthermore, the M@ZIF-67 exhibits a precise heterometal content, which plays a crucial role in enhancing the catalytic performance of CO2 cycloaddition, surpassing results obtained through traditional ZIF-67.