Classical Hydrides (Example Metallic Hydrides AB 2 , AB 5 , A 2 B and other Hydrides)…….12 (2) Complex Hydrides (Alanates, Imide-Amide complexes, Borohydrides, and others)………12 (3) Chemical Hydrides (CH4, NH 3 , CH 3 OH, and others)…………………………….……......12 (4) Nanostructured molecular hydrogen sorption material (carbon nanotubes)…….……...…..13 (5) Current Hydrogen Storage Technology ………………………………………………..…..13 (6) Hydrogen Storage System Engineering Concerns ……………………………….………...13 II. Background …………………………………………………………………………….