FeMo-based catalysts for H2 production by NH3 decomposition

Active and stable catalysts for ammonia decomposition were obtained by deposition of Fe(5 wt%)-Mo(5 wt%) on commercial stabilized zirconia and modified aluminas. The adopted preparation methodology, combined with a severe reduction treatment, allowed obtaining highly dispersed nanoparticles of Fe-Mo alloy, as revealed by powder XRD. The bimetallic catalysts demonstrated a higher activity with respect to the monometallic ones with the same metal loading (10 wt%). The best performances were obtained for a bimetallic Fe5Mo5/La2O3-modified Al2O3 sample. During ammonia decomposition reaction, the Fe-Mo alloy was progressively converted into a mixture of Fe/Mo nitrides, while good catalytic activity was maintained. The performances of the present catalysts well fit with the requirements of catalysts for application in ammonia-fueled SOFCs or for internal combustion engines.