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- In relation to this article, we declare that there is no conflict of interest.
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Received July 19, 2023
Accepted November 5, 2023
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Synthesis and Characterization of Bimetallic ZnCo-ZIF-71 with Defect for an Effi cient Catalytic CO 2 Conversion
Abstract
A bimetallic zinc and cobalt zeolitic imidazolate framework (ZnCo-ZIF-71) catalyst was synthesized using metal acetate and
4,5-dichloroimidizole in a methanol solution. Various physicochemical analytical techniques were employed to characterize
the synthesized catalyst and to confi rm the existence of uniform distribution of Zn and Co atoms throughout the catalyst
system. CO 2 -epoxide cycloaddition reactions were subsequently carried out to test the performance of ZnCo-ZIF-71. The
bimetallic ZIF showed a higher conversion of epoxide compared to that of the corresponding monometallic ZIF (Zn-ZIF-71
and Co-ZIF-71), likely due to the prevalence of linker defects in bimetallic ZIF system. The degree of linker defects in bimetallic
ZIFs was characterized based on molecular simulations. The mechanism for the solvent-free CO 2 -epoxide cycloaddition
reaction catalyzed by ZnCo-ZIF-71 was proposed following the XAFS analysis and DFT calculations.
