catalytic reactor 7 wherein it is decomposed to hydrogen and nitrogen any residual ammonia may be removed in an optional purification unit 8 the resulting hydrogen and nitrogen are rare then fed through pipe 9 into an electrochemical power generating device in the form of a hydrogen fuelled fuel cell 10 in a preferred embodiment the fuel cell is a fuel cell of the pem or alkaline type fig6 schematically shows a further embodiment of an ammonia delivery device of the invention which comprises a number of individual containers 2 container 1 2 n each comprising an ammonia storage and delivery material 1 according to the invention and individual sources of heat heat 1 heat 2 heat n for heating the individual containers sequentially and individual valves for opening the outlet 4 of the container from which ammonia is released in another embodiment of the invention rings or larger blocks of more complicated shapes of the storage material may be produced in this example rings having an outer diameter of 52 millimetres and a central hole having a diameter of 27 millimetres were made using the procedure described in example 1 using corresponding moulds made from stainless steel 20 grams of the solid ammonia delivery material were compressed for the preparation of.