Name : [in Japanese]
Location : [in Japanese]
Date : August 09, 2016 - August 10, 2016
Pages 268-269
Hydrogen is a CO2 free fuel and can be stored in many different forms as compressed or liquefied hydrogen in tanks. Liquid ammonia has been expected as a hydrogen carrier because it has a high H2 storage capacity with 17.8 wt% and 10.7 kgH2/100L at 1MPa and 298K. The volumetric hydrogen density is about 1.5 times of liquid hydrogen, and it is easily liquefied under about 1 MPa at room temperature. Current PEM fuel cells are poisoned even by trace levels (~1 ppm) of ammonia. The catalyst such as Ru supported on MgO shows the ammonia conversion of 99.8 % at 773K, which corresponds to ammonia concentration of 1000 ppm. After hydrogen and nitrogen generation by ammonia cracking, ammonium hydrogen sulfate (NH4HSO4) can be utilized to decrease the ammonia concentration from 1000 ppm to 0.1 ppm.