Issue 20, 2023

Dicyano-functionalized indium framework as a heterogeneous catalyst for CO2 fixation in the absence of solvent and co-catalyst

Abstract

Catalytic carbon dioxide (CO2) transformation into valuable products is of great interest, especially the development of innovative methods for CO2 fixation reactions. In this paper, we report the porous cyanide-functionalized MIL-68(In) metal–organic framework as a novel Lewis acid–base bifunctional catalyst. The MIL-68(In) framework was modified with different cyanide functional groups, such as 1,3-phenylene diacetonitrile and malononitrile, for the catalytic CO2 fixation reaction into cyclic carbonates. The properties of the synthesized catalysts were fully characterized using different techniques, including PXRD, FTIR, N2 adsorption, BET, SEM, XPS, TGA, NH3-TPD, and CO2-TPD. Under the optimized conditions (30 mg catalyst, 1 MPa CO2 pressure, 20 mmol epichlorohydrin, 100 °C, 10 h), MIL-68(In) functionalized with 1,3-phenylene diacetonitrile was found to afford a remarkable heterogeneous catalyst with selectivity (100%) and high conversion (99%) for the coupling reaction between CO2 and the epoxide without any co-catalyst or solvent. Moreover, the functionalized MIL-68(In) MOF also revealed applicability to other large epoxides. The enhanced activity of functionalized MIL-68(In) results from the collaboration between the unsaturated Lewis acidic indium centers and cyanide functional groups as nucleophilic sites. Furthermore, the reusability tests demonstrated that the modified MIL-68(In) was easily recycled by filtration and reusable for at least five runs with no loss in catalytic ability.

Graphical abstract: Dicyano-functionalized indium framework as a heterogeneous catalyst for CO2 fixation in the absence of solvent and co-catalyst

Supplementary files

Article information

Article type
Paper
Submitted
08 Aug. 2023
Accepted
31 Aug. 2023
First published
04 Sept. 2023
This article is Open Access
Creative Commons BY-NC license

Mater. Adv., 2023,4, 4921-4928

Dicyano-functionalized indium framework as a heterogeneous catalyst for CO2 fixation in the absence of solvent and co-catalyst

N. Bayati and S. Dehghanpour, Mater. Adv., 2023, 4, 4921 DOI: 10.1039/D3MA00513E

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