Given its wide availability, seawater is the most suitable and sustainable replacement for hydrogen in ammonia synthesis powered by NTP. The previously described challenges and opportunities have motivated us to substitute of H2 by seawater during the synthesis of ammonia powered by a dielectric-barrier discharge (DBD) non-thermal plasma. To benchmark and compare the ammonia synthesis rate obtained from N2 wet with seawater vapor a feed mixture of H2 and N2 was also employed for NTP-assisted ammonia synthesis. We have found the excellent ammonia synthesis rate of 3.7 mmol.gcat -1 .h -1 and the energy yield of 3.2 catalysts were prepared by incipient wetness impregnation method using metallic nitrates as precursors. The samples were calcined at 500 °С for 4 hrs with a heating rate of 1 o C.min -1 .