Interwrapping Distinct Metal-Organic Frameworks in DualMOFs for the Creation of Unique Composite Catalysts

Incorporating metal nanoparticles(MNPs)inside metal-organic frameworks(MOFs)demonstrates superior catalytic properties in numerous reactions;however,the size and distribution of MNPs could not be well controlled,resulting in low product selectivity in catalysis by undergoing different catalytic reaction pathways.We report herein a facile strategy for integrating lattice-mismatched MOFs together to fabricate homogeneously distributed“dual-MOFs,”which are the ideal precursors for the preparation of MNPs@MOFs with unique catalytic properties.As a proof of concept,we successfully synthesize a dual-MOF HKUST-1/ZIF-8 for in situ creation of redox-active Cu NPs inside hierarchical porous ZIF-8 under controlled pyrolytic conditions.Combining the advantages of size-tunable Cu NPs in the molecular sieving matrix of ZIF-8,Cu@ZIF-8 demonstrates high activity and selectivity for transformation of alkynes into alkenes without overhydrogenation,which surpasses most of the catalysts in the literature.Therefore,this work paves a new pathway for developing highly efficient and selective heterogeneous catalysts to produce highly value-added chemicals.