A New Member of the Metal‐Porphyrin Frameworks Family: Structure, Physicochemical Properties, Hydrogen and Carbon Dioxide Adsorption

Abstract

Abstract A novel holmium‐based porous metal‐porphyrin framework, {(H3O+)[Ho(H2TPPS)]− ⋅ 4H2O}n (denoted as UPJS‐17), was synthesised by hydrothermal reaction. Structural analysis reveals, that UPJS‐17 has a three‐dimensional open framework. The framework is negatively charged and the negative charge is compensated by hydronium cation. The compound showed no N2 adsorption but the Ar, CO2 and H2. From the argon adsorption, the surface area of ~150 m2 g−1 was determined. Carbon dioxide adsorption was measured at various temperatures (0, 10, 20, 30 and 40 °C) and the compound showed the highest adsorption capacity (at 0 °C) of 7.0 wt % of CO2. From the carbon dioxide adsorption isotherms the isosteric heat of 56,5 kJ mol−1 was determined. Hydrogen adsorption was studied at −196 °C with hydrogen uptake of 2.1 wt % at 1 bar.

Keywords

• carbon dioxide adsorption
• hydrogen adsorption
• isosteric heats
• metal-organic frameworks
• metal-porphyrin frameworks