ZSM-5 zeolite possesses a three-dimensional network of microporous channels formed by oxygen-linked Si and Al tetrahedra, which confers a high surface area, stability, and hydrophobic properties that increase with the Si/Al ratio. These characteristics make ZSM-5 a suitable material for the adsorption of gases such as hydrogen. In pure ZSM-5, hydrogen storage occurs primarily through physisorption in the micropores, exhibiting type I isotherms and an adsorption capacity that increases with pressure, especially at low temperatures. The relatively low adsorption energy indicates weak interactions that keep the hydrogen in a molecular state and allow for its reversible release. However, the sto... More >