Exploring the Performance Improvement for CO₂ Chemical Fixation in Zn/ZnMg-MOFs

Abstract

A new 3D zinc-based metal–organic framework {[Zn7L2(DMF)3(H2O)­(OH)2]·5DMF} n (1) (H6L = 5,5′,5″-(methylsilanetriyl) triisophthalic acid) was constructed with an organosilicon-based linker, where H6L is a tetrahedral structure furnished with rich −COO– chelating sites for Zn­(II) immobilization. Compound 1 exhibited two types of irregular one-dimensional channels and a three-dimensional skeleton with large specific surface area, making it a promising catalytic platform. Moreover, by incorporation of the second metal ion into the inorganic node of framework 1, isomorphic bimetallic MOF ZnMg-1 was successfully synthesized. ZnMg-1 demonstrated enhanced catalytic activity compared to 1 under identical conditions. Contrast experiments and theoretical calculations indicate that bimetallic active sites play a facilitating role in the chemical fixation of epoxides and CO2. It indicated that efficient chemical fixation of CO2 to cyclic carbonates was obtained over isomorphic MOF catalysts 1 and ZnMg-1.

Experimental and Theoretical Investigation of Interfacial Engineering in Fe2O3/NiFe2O4 Heterostructures toward the Cycloaddition of CO2 with Styrene Oxide

“…Heterogeneous catalysts are hence more attractive candidates in this area for their facile separation, simplicity in operation, and good recycling performance. The explored heterogeneous catalysts include the heterogenization of metal complexes on various supports, − metal–organic frameworks, − precious-metal-based catalysts, − and metal oxides. − Despite the great progress already achieved, there is still much room for further development of an advanced and cost-effective catalyst for the cycloaddition of CO 2 with epoxides.…”