Hydrogen generation from hydrolysis of ammonia-borane using PdaPVBaTiO2 and CoaNiaP/PdaTiO2 under stirred conditions

The employment of PdaPVBaTiO2 and CoaNiaP/PdaTiO2 in hydrogen generation from the hydrolysis of ammonia-borane (H3NBH3, AB) under stirred conditions are reported. Both catalysts are found to be highly active, isolable, and reactivatable in the hydrolysis of ammonia-borane even at low concentrations and temperature. The Arrhenius activation energies were found to be 54.9 and 54.7 kJ mola1 for the hydrolysis of ammonia-borane catalyzed by PdaPVBaTiO2 and CoaNiaP/PdaTiO2, respectively. Maximum hydrogen generation rates in the hydrolysis of AB catalyzed by the PdaPVBaTiO2 catalyst (1.5 mM) are 1910 and 14,800 mL H2 mina1 (g Pd)a1 at 25 and 55-0.5 [deg]C, respectively. The maximum hydrogen generation rates are 170 and 1390 mL H2 mina1 (g catalyst)a1 for the hydrolysis of AB catalyzed by CoaNiaP/PdaTiO2 (25 mg) at 25 [deg]C and 55-0.5 [deg]C, respectively. In comparison to unstirred conditions, these results demonstrate that a significant external mass transfer resistance caused by the desorbed metaborate by-products exist in the under unstirred conditions.