Effects of pore size and surface area on CH4 and CO2 capture in mesostructured MIL-101
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Self-assembly of surfactant, chelating agent, metal ions and bridging ligands is an effective method generates mesostructured metal–organic frameworks (MOFs). At present work, we use quaternary ammonium surfactant, cetyltrimethylammonium bromide as a supramolecular template and citric acid as the chelating agent. Micro, meso- and macro-porous areas were observed from new MOFs indicated interconnected porosities, as pointed out with pore size distribution analyses. The base surface area, pore volume, particle size and morphology can be varied by applying the different molar ratio of surfactant, chelating agent and metal ions. Based on the obtained results, hierarchically mesostructured MIL-101 with augmented pore volume toward primary MOF shows increased CH4 capture with comparison of standard MIL-101. In the case of CO2 adsorption, a kind of synergism of surface area and pore diameter is required to more capacity for the gas can be achieved.
KeywordsCO2 adsorption Metal–organic frameworks MIL-101 CH4 adsorption
Support of this investigation by Mazandaran Gas Company, Tarbiat Modares University and Razi University are gratefully acknowledged.
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