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http://dx.doi.org/10.3740/MRSK.2018.28.9.506

CH4/N2 Separation on Flexible Metal-Organic Frameworks(MOFs)  

Jung, Minji (Department of Energy Engineering, Gyeongnam National University of Science and Technology)
Park, Jawoo (Department of Energy Engineering, Gyeongnam National University of Science and Technology)
Oh, Hyunchul (Department of Energy Engineering, Gyeongnam National University of Science and Technology)
Publication Information
Korean Journal of Materials Research / v.28, no.9, 2018 , pp. 506-510 More about this Journal
Abstract
Nitrogen is a serious contaminant in natural gas because it decreases the energy density. The natural gas specification in South Korea requires a $N_2$ content of less than 1 mol%. Thus, cost-effective $N_2$ removal technology from natural gas is necessary, but until now the only option has been energy-intensive processes, e.g., cryogenic distillation. Using porous materials for the removal process would be beneficial for an efficient separation of $CH_4/N_2$ mixtures, but this still remains one of the challenges in modern separation technology due to the very similar size of the components. Among various porous materials, metal-organic frameworks (MOFs) present a promising candidate for the potential $CH_4/N_2$ separation material due to their unique structural flexibility. A MIL-53(Al), the most well-known flexible metal-organic framework, creates dynamic changes with closed pore (cp) transitions to open pores (ops), also called the 'breathing' phenomenon. We demonstrate the separation performance of $CH_4/N_2$ mixtures of MIL-53(Al) and its derivative $MIL-53-NH_2$. The $CH_4/N_2$ selectivity of $MIL-53-NH_2$ is higher than pristine MIL-53(Al), suggesting a stronger $CH_4$ interaction with $NH_2$.
Keywords
MIL-53(Al); $MIL-53-NH_2(Al)$; $CH_4/N_2$; separation;
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