Metal-organic framework decorated styrene-maleic acid (SMA) co-polymer beads were synthesized by slow diffusion of TEA. The obtained materials were characterized by FTIR, scanning electron microscopy, and thermogravimetric analysis. The different dicarboxylic acid linkers influenced the crystal morphologies and hydrogen-storage behavior of the polymer beads. Hydrogen-storage measurements revealed slow micropore opening mechanism involved in adsorption of hydrogen. 1. Introduction Hydrogen is considered as an interesting energy vector particularly for vehicular applications due to its attractive properties such as nontoxicity, clean combustion, and high energy density [1]. Hydrogen binds to surfaces by weak dispersive interactions (physisorption) or through stronger chemical associations (chemisorption). Physisorption correlates with surface area, high surface area favours higher gas uptake. Thus, materials with large surface areas and low densities are attractive candidates for hydrogen-storage applications [2]. The physisorption method of hydrogen storage required sorbent with a large surface area such as activated carbons and carbon nanostructures [3], zeolites [4], porous polymers [5], and metal-organic frameworks (MOFs) [6]. Due to weak sorbent-sorbate interaction, physisorption-based hydrogen-storage systems show fast kinetics with a charging time of minutes. However, the same weak interaction results in less than 2？wt% gravimetric hydrogen uptake at ambient temperature and applicable pressure [7]. However, a number of significant technological hurdles need to be overcome for realizing these applications which include safe, compact, and high capacity hydrogen-storage systems [8]. Low-density microporous solids have garnered considerable scientific attention due to their potential practical applications including emerging energy challenges, catalysis, hydrogen and methane storage, and chemical separations [9]. Hypercrosslinked polymers (HCPs) represent a class of predominantly microporous organic materials that exhibit high surface areas, “Davankov-type” resins being the most studied hypercrosslinked materials [10]. Due to light elemental compositions, additional functionalities can be introduced to the porous organic polymers through large number of synthesis routes; chemical and thermal stability and scalable technology possess potential advantage for gas sorption [11]. Porous metal-organic frameworks (MOFs) have been emerging as one type of the most promising materials for hydrogen storage because of their amenability to design and extraordinary
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