Author/Authors :
Lupu، نويسنده , , Dan and Ardelean، نويسنده , , Ovidiu and Blanita، نويسنده , , Gabriela and Borodi، نويسنده , , Gheorghe and Lazar، نويسنده , , Mihaela D. and Biris، نويسنده , , Alexandru R. and Ioan، نويسنده , , Coldea and Mihet، نويسنده , , Maria and Misan، نويسنده , , Ioan and Popeneciu، نويسنده , , Gabriel، نويسنده ,
Abstract :
A new metal-organic framework [Fe3O(OOC-C6H4-COO)3(H2O)3]Cl·(H2O)x was synthesized with a specific surface area of 2823 m2/g and a lattice parameter of 88.61 إ. Isostructural with MIL-101, this compound exhibits similar hydrogen adsorption properties, with maximum adsorption capacity of 5.1wt.% H at 77 K. The adsorption enthalpy of hydrogen for MIL-101 and ITIM-1 (MIL-101Fe) at zero coverage was calculated for a wide temperature range of 77 K ÷ 324 K, considering corrections for the variation of hydrogen gas entropy with the temperature. The resulted adsorption enthalpy is 9.4 kJ/mol for MIL-101, in excellent agreement with the value reported in literature from microcalorimetric measurements, and a value of 10.4 kJ/mol at zero coverage was obtained for ITIM-1 (MIL-101Fe).
Keywords :
Metal-organic frameworks , Iron , Hydrogen , Heat of adsorption
