(US5976723-A)      Method for cracking ammonia into hydrogen involves exposing an ammonia cracking catalyst to ammonia under conditions effective to produce nitrogen and hydrogen. The catalyst comprises an alloy including (1) alloys of general formula Zr1-xTixM1M2, where M1 and M2 each = chromium, manganese, iron, cobalt and nickel; x = 0-1, and (2) aluminium in an amount 20-50 wt.%.    Also claimed is a method for operating a hydrogen-fuelled internal combustion engine or hydrogen fuel cell having an ammonia storage vessel coupled with an ammonia cracking vessel which involves: (a) passing ammonia from the storage vessel into the cracking vessel containing the cracking catalyst to produce nitrogen and hydrogen gases, (b) passing the hydrogen to the engine or hydrogen fuel cell and (c) combusting the hydrogen gas to power the engine or reacting the hydrogen in the fuel cell to produce an electric current.    Also claimed is a hydrogen-fuelled internal combustion engine which comprises an ammonia storage vessel coupled with an ammonia-coupled chamber containing the catalyst and an internal combustion engine effective to combust hydrogen.    USE -   For use in hydrogen-fuelled internal combustion engine or hydrogen fuel cell.    ADVANTAGE -   The catalyst can catalyse the disproportionation of ammonia at efficiency and rates sufficient for use in internal combustion engines or fuel cells.    (EP1003689-A1)      Method for cracking ammonia into hydrogen involves exposing an ammonia cracking catalyst to ammonia under conditions effective to produce nitrogen and hydrogen. The catalyst comprises an alloy including (1) alloys of general formula Zr1-xTixM1M2, where M1 and M2 each = chromium, manganese, iron, cobalt and nickel; x = 0-1, and (2) aluminium in an amount 20-50 wt.%.    Also claimed is a method for operating a hydrogen-fuelled internal combustion engine or hydrogen fuel cell having an ammonia storage vessel coupled with an ammonia cracking vessel which involves: (a) passing ammonia from the storage vessel into the cracking vessel containing the cracking catalyst to produce nitrogen and hydrogen gases, (b) passing the hydrogen to the engine or hydrogen fuel cell and (c) combusting the hydrogen gas to power the engine or reacting the hydrogen in the fuel cell to produce an electric current.    Also claimed is a hydrogen-fuelled internal combustion engine which comprises an ammonia storage vessel coupled with an ammonia-coupled chamber containing the catalyst and an internal combustion engine effective to combust hydrogen.    USE -   For use in hydrogen-fuelled internal combustion engine or hydrogen fuel cell.    ADVANTAGE -   The catalyst can catalyse the disproportionation of ammonia at efficiency and rates sufficient for use in internal combustion engines or fuel cells.    (CN1250425-A)      Method for cracking ammonia into hydrogen involves exposing an ammonia cracking catalyst to ammonia under conditions effective to produce nitrogen and hydrogen. The catalyst comprises an alloy including (1) alloys of general formula Zr1-xTixM1M2, where M1 and M2 each = chromium, manganese, iron, cobalt and nickel; x = 0-1, and (2) aluminium in an amount 20-50 wt.%.    Also claimed is a method for operating a hydrogen-fuelled internal combustion engine or hydrogen fuel cell having an ammonia storage vessel coupled with an ammonia cracking vessel which involves: (a) passing ammonia from the storage vessel into the cracking vessel containing the cracking catalyst to produce nitrogen and hydrogen gases, (b) passing the hydrogen to the engine or hydrogen fuel cell and (c) combusting the hydrogen gas to power the engine or reacting the hydrogen in the fuel cell to produce an electric current.    Also claimed is a hydrogen-fuelled internal combustion engine which comprises an ammonia storage vessel coupled with an ammonia-coupled chamber containing the catalyst and an internal combustion engine effective to combust hydrogen.    USE -   For use in hydrogen-fuelled internal combustion engine or hydrogen fuel cell.    ADVANTAGE -   The catalyst can catalyse the disproportionation of ammonia at efficiency and rates sufficient for use in internal combustion engines or fuel cells.