Hydrogen Adsorption Study On Metal-Organic Frameworks

As a regenerative energy, hydrogen enengy was widespread attention by worldwide as its no pollution. Hydrogen preparation, storage and application should be settled to make the best use of hydrogen enengy. Hydrogen storage is the key component of the three parts. Research and development new hydrogen storage material is the hotspot in order to achieve the target of the DOE. Porous material physisorption technology is recognized as the most hopeful hydrogen storage technology.Porous metal organic framework compounds is in the field of materials science a new important development direction being increasingly broad attention. Although the thermal stability of porous metal organic framework compounds less than microporous inorganic matrix materials, in the traditional high-temperature catalytic application of the restrictions, but in some non-traditional areas, such as nonlinear optical materials, magnetic materials, superconducting materials, and hydrogen storage materials, and other new materials application prospects are continue to be developed.In this study, MOF-5compounds have been synthesized by direct mixing reaction、solvothermal reaction and modified solvothermal reaction. The properties of the resulting products have been characterized with XRD, TG, and BET. The pore structure and pore size distribution were studied by BET nitrogen adsorption. Hydrogen storage capability was investigated by hydrogen adsorption.The results showed that the solvent was removed at300℃, framework collapse at400℃. Pore structure was almost micropore, mesopore and macrpore partial. The Langmuir surface area of direct mixing reaction, solvothermal reaction and modified DEF solvothermal reaction was1130m2/g、1042m2/g and1337m2/g respectively.The pore size of the calcined samples was bimodal distribution between≤1nm and1.5～2.0nm. When it was calcined at300℃, the Langmuir specific surface area and pore volume was1243m2/g and0.46cm3/g respectively. The hydrogen adsorption capability was1.3wt%at77k and1bar. When the calcine temperature at400℃,the Langmuir specific surface area、pore volume and hydrogen adsorption capability decline to1113m2/g,0.43cm3/g and0.8wt%respectively because of the framework collapse.