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

A novel holmium-based porous metal-porphyrin framework, {(H3O+)[Ho(H2TPPS)](-)center dot 4H(2)O}(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 N-2 adsorption but the Ar, CO2 and H-2. From the argon adsorption, the surface area of similar to 150 m(2) g(-1) was determined. Carbon dioxide adsorption was measured at various temperatures (0, 10, 20, 30 and 40 degrees C) and the compound showed the highest adsorption capacity (at 0 degrees 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 degrees C with hydrogen uptake of 2.1 wt % at 1 bar.