Neutron scattering is one of the few experimental techniques that can directly determine the state of confined H2 molecules in microporous solids. In this proposal, we seek to investigate hydrogen densification in both cylindrical and slit pores at a micropore size range of > 1 nm for adsorptive hydrogen storage. Furthermore, we will perform a comparative study on the INS data with experimental high-pressure volumetric adsorption data as well as molecular modeling results for hydrogen densification in a variety of cylindrical and slit pores in the range of interest. The dependence of hydrogen density and hydrogen packing on pore geometry for pore sizes will then be identified. The new information on the effects of cylindrical and slit pores geometries on hydrogen densification in nanoporous carbon materials will impact on design of future porous adsorptive hydrogen storage materials.