A study of hydrogen storage in zirconium-containing NaY5.7 zeolite

F. Mulana

Abstract


The inclusion of metals/alloys inside the pores of zeolite is of a great interest for developing composites with functional materials distributed in the intended fields. Zirconium-containing NaY5.7 zeolite samples with 1 wt% and 3 wt% metal loading were prepared using impregnation method. The starting material was commercial available NaY5.7 zeolite and zirconocene dichloride ((C5H5)2ZrCl2)as zirconium source and benzene as solvent. The characterization of samples was performed by X-ray diffraction (Rigaku RINT2000) using a Cu Kα radiation, nitrogen adsorption isotherms, hydrogen sorption isotherms and heats of sorption by a twin-conduction-type calorimeter (Tokyo Riko Co., Japan) equipped with a volumetric adsorption system at 298 K. The X-ray diffraction pattern reveals that the framework structure of zeolite is retained in the calcination condition performed and the metallic form of zirconium exists on zeolite particles. The nitrogen adsorption isotherm for the zirconium-containing NaY5.7 zeolite was similar to that for the untreated zeolite which indicates that Zr-NaY sample retains its structure even after the heat treatment at higher temperature. The hydrogen sorption on Zr-NaY5.7 zeolite was brought about by a combination of formation of solid solution inside zeolite pores and hydridation of zirconium species. The inclusion of zirconium inside the framework of NaY5.7 zeolite has increased the amount of occluded hydrogen on all synthesized samples. NaY5.7 zeolite itself could occlude hydrogen approximately 0.097 mmol H2/gr at low hydrogen pressure of 80 kPa. Zirconium-NaY5.7 zeolite system, which resided zirconium nanoparticles inside the pores of zeolite, could be one of alternative composites to be used for hydrogen sorbing materials providing water resistance.


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