(436e) Development of MOF-74@Zeolite-5A Composite Adsorbents for H2 Purification

Authors: 
Thakkar, H., Missouri University of Science and Technology
Rownaghi, A., Missouri University of Science and Technology
Rezaei, F., Missouri University of Science and Technology
Hydrogen is considered as one of the most important clean and renewable energy sources for a sustainable energy future. However, its efficient and cost-effective purification still remains challenging. In this work, we report the development of novel MOF@Zeolite composites comprised of MOF-74 and Zeolite-5A with core-shell structure for efficient purification of H2. The composites were synthesized hydrothermally through the addition of Zeolite particles with and without carboxyl functional groups to the MOF synthesis solution. The MOF:Zeolite weight ratio was varied systematically to find the optimum composition based on the adsorption performance. The formation of MOF@Zeolite composites was confirmed by various characterization techniques. Single-component adsorption isotherms of CO2, CH4, H2, CO, and N2 were measured at 298 K and in the pressure range of 0 to 25 bar. The dynamic adsorption measurements were also performed using binary gas mixtures of CO2/H2, CH4/H2 and N2/H2. The selectivity values were estimated using ideal adsorbed solution theory (IAST) and also from breakthrough profiles. The MOF-74@Zeolite-5A with weight ratio of 95:5 exhibited a similar morphology to that of pristine MOF-74 but with a more ordered crystalline structure and higher surface area. Moreover, this composite showed 20-25% increase in CO2, CH4, CO, and N2 uptake and higher selectivity values in comparison to the bare MOF and Zeolite which could be attributed to the formation of new micropores at the MOF-Zeolite interface and also to the enhanced surface dispersive forces of the composite. The experimental adsorption isotherms were well fitted with single-site Langmuir-Freundlich model. Overall, the findings of this study suggest that the MOF-74@Zeolite-5A composites with core-shell structure are promising candidates for industrial H2 purification processes.

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