In this work, nitrogenation, ammonia generation, regeneration reactions of lithium -tin alloy is investigated as pseudo catalytic process of ammonia synthesis. Li17Sn4 synthesized by thermochemical method at 500 degrees C can react with 0.1 MPa of N-2 below 400 degrees C. Nano or amorphous lithium nitride would be formed by the nitrogenation. By reaction of the nitrogenated samples and H-2, ammonia is generated at 300 degrees C under 0.1 MPa. The initial alloy phase Li17Sn4 is regenerated below 350 degrees C from the products after the ammonia generation process. Based on the above three step process, ammonia can be pseudo catalytically synthesized from N-2 and H-2 below 400 degrees C under ambient pressure. Furthermore, the reactivity for the ammonia synthesis using Li Sn alloy is preserved during the NH3 synthesis cycles due to the characteristic reaction process based on the Li extraction and insertion. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.