Abstract
The continuous rise in the atmospheric concentration of carbon dioxide gas (CO2) is of significant global concern. Several methodologies and technologies are proposed and applied by the industries to mitigate the emissions of CO2 into the atmosphere. This review article offers a large number of studies that aim to capture, convert, or reduce CO2 by using a superb porous class of materials (metal-organic frameworks, MOFs), aiming to tackle this worldwide issue. MOFs possess several remarkable features ranging from high surface area and porosity to functionality and morphology. As a result of these unique features, MOFs were selected as the main class of porous material in this review article. MOFs act as an ideal candidate for the CO2 capture process. The main approaches for capturing CO2 are pre-combustion capture, post-combustion capture, and oxy-fuel combustion capture. The applications of MOFs in the carbon capture processes were extensively overviewed. In addition, the applications of MOFs in the adsorption, membrane separation, catalytic conversion, and electrochemical reduction processes of CO2 were also studied in order to provide new practical and efficient techniques for CO2 mitigation.
Highlights
The Earth’s global climate system is continually facing devastating changes due to various human-made and natural factors
The results highlighted that the PSF+ (ZIF-8/graphene oxide (GO)) matrix membrane (MMM) showed an enhancement in the CO2 permeability and the selectivity of the CO2 /CH4 pair, compared to the pristine PSF membrane
The study results showed that the best thin-film catalyst with an optimal metal-organic frameworks (MOFs)/rGO ratio exhibited a high evolution rate of carbon monoxide (CO) 3.8 × 104 μmol h−1 gfilm −1 (0.46 min−1 in TOF) and an acceptable selectivity of 91.74% [144]
Summary
The Earth’s global climate system is continually facing devastating changes due to various human-made and natural factors. One of the best-used porous materials in carbon capture technologies are metal-organic frameworks (MOFs). This review paper investigates MOFs’ applications in the CO2 capture, adsorption, separation, conversion, and reduction processes It aims to draw and provide general guidelines and conclusions for the MOFs’ importance as a porous material for carbon dioxide gas-related process. MOFs have well defined crystallographic and geometric three-dimensional (3D) microporous structures [7] These structures are sturdy and durable, allowing the removal of the included guest species, which results in permanent porosity. Flexible MOFs hold a dynamic and soft framework with a fast response to external stimuli, for example, guest molecules, temperature, and pressure This extraordinary and superb sensitivity to external stimuli allows the MOFs to possess special properties such as temperature/pressure-dependent molecular sieving, which puts them ahead of the traditional adsorbents, including activated carbons and zeolites. 10, 1293 structures sturdy and durable, allowing the removal of the included guest species, which results in permanent porosity
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