(336a) Achieving Optimal Hydrogen Storage In MOF-5

Storage of hydrogen in condensed phases has the potential to be more efficient and less expensive than the most widely used storage method, compressed gaseous hydrogen. While substantial progress has recently been made in identifying improved hydrogen storage materials, significant challenges associated with the engineering of the storage system around a candidate storage material persist. In particular, the degree to which materials processing can act as a countermeasure to improve upon the deficiencies of a given storage material is largely unknown. This paper will detail recent efforts aimed at determining the processing-structure-properties (PSP) relationships for an important class of sorbent materials [metal organic frameworks (MOFs)] in order to devise improved packing and processing strategies for their use in a hydrogen storage systems context. In particular, we will detail various mechanical processing routes that have been explored (ranging from powders to pelletization) in an effort to simultaneously maximize packing density, heat and mass transfer, and hydrogen uptake characteristics. We will specifically highlight compaction studies for Basolite Z100H (the commercial form of MOF-5) wherein the relevant hydrogen storage properties have been characterized as a function of processing route for the identification of preliminary PSP relationships. The intent of this investigation is to identify rational pathways by which materials properties can be optimized towards achieving commercially-viable hydrogen storage systems, and to reveal the upper limits of performance achievable with current-generation hydrogen storage materials.