Hydrogen storage in highly microporous solids derived from aluminium biphenyldiphosphonate

Rigid biphenyldiphosphonic (BPDP) and phosphorous acids (H 3PO3) were incorporated into aluminum salts to produce microporous materials with improved hydrogen intake capabilities. A proper balance between available volume accessible to hydrogen, high contact surface, and strong interaction with polarizing centers are the necessary features for efficient hydrogen storage. The hydrothermal treatment in autoclave of a solution in a mixture of acetone/water of AlCl3 3 eq), BPDP, and H3PO3 acids in different ratio resulted in materials designated as UAM-150 (BPDP 0.5 eq, H3PO3 0 eq), UAM-151 (BPDP 0.25 eq, H3PO3 0.5 eq), and UAM-152 (BPDP 0.125 eq, H3PO3 0.75 eq). The hydrogen intake displayed by material UAM-152 was close to the highest reported for organic-inorganic materials at 77 K and atmospheric pressure.