A robust material for the uptake and storage of ammonia at densities that come close to that of the liquefied gas
(PHYSorg.com Chemistry)

Handling, storing, and shipping of ammonia requires costly equipment and special precautions because of its inherent corrosiveness and toxicity. Scientists in Manchester, UK, have found that a metal-organic framework, MFM-300(Al), a porous solid, not only effectively filters harmful nitrogen dioxide gas, but it also has outstanding capabilities for ammonia storage. As detailed in the journal Angewandte Chemie, reversible uptake and release of ammonia proceeds by a unique sorption mode.