Abstract
This chapter presents the analysis of the influence on the gas adsorption of the crystal structure modifications by the ionic exchanges of the dehydrated lithium (Li) A zeolite. The hydrogen adsorption under pressure up to 1 MPa and at room temperature on the NaA zeolite and on its fully and partially lithium exchanged forms is studied. The sodium (Na) A zeolite is prepared by hydrothermal method, and its ionic exchange in different level by lithium is obtained by successive contacts. The structural characterizations have been evaluated by scanning electronic microscopy (SEM), X-ray diffraction (XRD), nuclear magnetic resonance (NMR), atomic absorption, and helium density measurements. There was no loss of crystallinity after ionic exchange in the zeolites. The hydrogen adsorption capacity varies with the increase of the cation exchange rates. Hydrogen adsorption is due to sterical effects and gas–solid molecular interactions, which are intimately linked to the adsorbent structure modifications and the chemical nature of cations containing zeolite.
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