Ammonia NH(3) is recognized as one of the attractive hydrogen H(2) carriers because it has a high hydrogen content of 18 mass% and it is easily liquefied under about 1 MPa of pressure at a room temperature. NH(3) can react with alkali metal hydrides and generate H(2) even at room temperature, resulting that metal amides are formed as reaction products. The H(2) generation is exothermic reaction, and it is not effectively prevented by H(2) partial pressure in a closed system as thermodynamic properties. In this work, we demonstrated the production of compressed H(2) by the reaction between liquid NH(3) and lithium hydride LiH in a closed pressure vessel, where liquid NH(3) would realize better kinetic properties for the reaction with metal hydride than gaseous NH(3). Actually, more than 12 MPa H(2) was obtained within several hours. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.