Hydrogen Storage on Porous Absorbers with a Zeolite Composition

The processes of hydrogen absorption in porous ceramic materials have been studied. The results of the synthesis of porous materials for use in hydrogen absorbers are presented. The dependences of the degree of hydrogen absorption on the composition of the absorber, as well as on the temperature of hydrogen sorption, are obtained. It is shown that aluminosilicate materials synthesized from raw materials fused in a solar furnace with a specific surface area of 2500 cm²/g can be used as hydrogen absorbers for the physical binding of hydrogen in pores by Van der Waltz forces at high (30–50 atm) pressures. It was revealed that the aspect number, i.e., the ability of the material to absorb hydrogen at 200°C, varies from composition to composition. The maximum value of the aspect number (4.3 wt %) corresponds to a material with a diatomite content of 70 wt % and burnout additives of 20% by weight. It is shown that a porous material based on AlSiNaO sodium aluminosilicate with lattice parameter a = 4.056 А is a good hydrogen absorber. With an increase in the temperature of the sorption process from 100 to 190°C, the value of the aspect number increases from 3 wt % up to 13 wt %.