CuBTC—copper (II) benzene-1,3,5-tricarboxylate (C18H6Cu3O12) (HKUST-1) for CO2 capture

“CuBTC—copper (II) benzene-1,3,5-tricarboxylate (C18H6Cu3O12), also known as HKUST-1, is a highly porous MOF of [Cu3(BTC)2(H2O)3]n, that contains interconnected [Cu2(O2CR)4] units, where R is an aromatic ring. The accessible porosity of the 3D framework reaches 40% of the solid with a channel pore size of 1 nm [19]. CuBTC is one of the most studied MOFs with open metal sites (unsaturated Cu centers) that is believed to promote the attraction of small gas molecules, especially polar molecules including water. As the flue gases contain about 5–7 vol% of water vapor, the practical application of CuBTC could be complex. As an important disadvantage of CuBTC is its high sensitivity to moisture, several techniques have been used to improve the hydrolytic properties of the material, including modification by the introduction of hydrophobic functional groups and coating with hydrophobic compounds, but although highly effective in improving hydrolytic stability, the disadvantage was the lengthy synthetic procedures or complex equipment and harsh synthesis conditions, thus hampering practical application [20]. CuBTC has been used for the adsorption of various gases (CO2, CO, CH4, H2, O2, N2) [21], though to improve its properties various carbon-containing [22,23,24] and clay-containing [25] composites of this MOF have been studied.”

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