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"Ammonia has been identified as a suitable hydrogen carrier. Ammonia is
essentially non flammable and is readily obtained and handled in liquid form
without need for expensive and complicated refrigeration technology. In addition,
ammonia contains 1.7 times as much hydrogen as liquid hydrogen for a given
volume. Compared to hydrogen, ammonia therefore offers significant advantages
in cost and convenience as a vehicular fuel due to its higher density and its easier
storage and distribution. Ammonia is produced and distributed world-wide in
million of tons per year. Procedures for safe handling have been developed in
every country. Facilities for storage and transport by barges, trucks and pipelines
from producer to ultimate consumer are available throughout the world.
Therefore liquid anhydrous ammonia is an excellent storage medium for
hydrogen even though the endothermic ammonia cracking results in some
efficiency penalty. The fuel capacity per weight of ammonia is higher compared
to methanol and the price per kW is lower."

http://www.electricauto.com/_pdfs/Portland Paper B.pdf