Covalent organic frameworks (COFs) have become a versatile platform to immobilize a wide variety of single-atom metal catalysts. The resulting post-synthetic modified materials present a spectrum of valuable properties ranging from homogeneous to heterogeneous systems, such as well-defined catalytic sites, selectivity, recyclability, and stability. In this minireview, we discuss selected contributions that provide experimental and computational details on reaction mechanisms (e. g., via EXAFS, TEM, and DFT) catalyzed by single-atom metals embedded within the COF structure. When applicable, we highlight the different behaviour between molecular (homogeneous) and COF-supported (heterogeneous) sites regarding catalytic performance. With this survey, we aim to decipher the key features that aid in seeing COFs as not merely passive supports but as active items in catalysis.
Gopakumar, A.; Ortuño, M. A.; Lloret-Fillol, J.
ChemCatChem 2024
DOI:
10.1002/cctc.202400100
Natural gas (primarily methane, CH4) is still a major energy source that is often simply flared into the atmosphere without being harnessed. As a cumulative result, unprecedented CH4 spikes have been reported lately in Earth’s atmosphere. Combined with the already existing Global warming concerns posed by other greenhouse gases such as CO2, CO, NOx, etc., CH4 abundance will lead to a worldwide catastrophe. Various attempts to convert and utilize CH4 into useful chemicals in mild reaction conditions have only seen limited success. In this proposal, we aim to target the CH4 molecule by fixing the CO2 molecule to produce acetic acid [CH3COOH, a high-value industrial chemical - the global acetic acid market attained a value of over 8.7 billion EUR in 2020 and is expected to grow at a compound annual growth rate (CAGR) of 5.5% from 2022 to 2027] via Photoelectrochemistry (PEC, using light and electricity) employing a new generation of heterogeneous catalysts called Single Atom Catalysts (SACs, containing abundantly available single transition metal atom embedded on transition metal oxide semiconductors that can rival catalytic efficacy of a well-defined homogeneous catalyst).
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