Effects of heat transfer on the sorption kinetics of complex hydride reacting systems

Nanoscopic Al1−xCex phases in the NaH + Al + 0.02CeCl3 system

“…As such, there has been considerable interest in NaAlH 4 storage tank development. In [10], a high temperature PEMFC stack was developed specifically for use with NaAlH 4 , with demonstrated service of over 5000 h running at 200 C. The first prototype NaAlH 4 storage tank contained 19 kg of catalyzed NaAlH 4 [11], a thermally optimized tank containing 8 kg of NaAlH 4 was trialed in [12], and NaAlH 4 hydrogenation kinetics were optimized based on cell diameter in [13]. The most recent work utilizes a 304 g labscale tank of NaAlH 4 þ 0.02CeCl 3 [14].…”

Assessment of errors on the kinetic data by entropy generation analysis

“…Indeed, increase in the shell reactor thickness increases the ratio of the heat capacity of the reactor wall to that of the metal hydride powder, also known as thermal inertia [14],…”

“…If the thermal time constant of the experimental device is reduced, very fast kinetics are observed. Recently, Lorenzo et al [14] investigated experimentally the effect of powder size on the absorption and desorption kinetics of NaAlH 4 catalyzed with TiCl 4 . The measurements of temperature, which were conducted at different positions inside the reaction bed during the process, provided detailed information about the influence of heat conduction and temperature level on the reaction kinetics.…”

Aluminium alloy based hydrogen storage tank operated with sodium aluminium hexahydride Na3AlH6

“…A typical hydrogenation pressure for NaAlH 4 is 10 MPa and higher [17,20]. The typical hydrogenation pressure for the i n t e r n a t i o n a l j o u r n a l o f h y d r o g e n e n e r g y 3 9 ( 2 0 1 4 ) 1 7 1 1 8 e1 7 1 2 8 Na 3 AlH 6 formation is approximately four times lower, compared to the hydrogenation pressure of NaAlH 4 at the same temperature.…”