The hydrogen storage capabilities of bulk ammonia borane make this material a promising candidate for use in the hydrogen economy; however, dehydrogenation thermodynamics and kinetics must improve before I will be considered for practical applications. Preparation of nano-phase ammonia borane enhances the hydrogen storage and release properties and prevents borazine formation, although the gravimetric density is decreased by a factor of two. Higher loading samples of ammonia borane encapsulated in mesoporous silica (nano-phase AB:SBA-15) was prepared in an effort to increase he gravimetric density while maintaining the enhanced kinetics and thermodynamics of the nano-phase material. At ratios greater than 1:1 by mass, borazine formation is observed similar to the bulk material. Further, as the ratio of ammonia borane to mesoporous silica increases, the onset for hydrogen release increases toward the bulk dehydrogenation temperature.