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http://ri.uaemex.mx/handle20.500.11799/68593| Title: | Facile synthesis of Cd-substituted zeolitic-imidazolate framework Cd-ZIF-8 and mixed-metal CdZn-ZIF-8 | Keywords: | Zeolitic-imidazolate frameworks;cadmium-imidazolate framework;mixed metal MOFs;molecular sieves;gas separation;info:eu-repo/classification/cti/2 | Publisher: | Microporous and Mesoporous Materials | Project: | DOI;10.1016/j.micromeso.2017.12.032 | Description: | scientific paper Zeolitic-imidazole framework ZIF-8 has attracted tremendous interests for the highresolution kinetic separation of propylene/propane mixture due to its effective aperture size in between the sizes of propylene and propane molecules. It is of great interest to fine-tune the effective aperture size of ZIF-8 either to improve its propylene/propane separation performances or to extend its use to the separation of other gas mixtures. It has been shown that substituting Zn with other metal nodes (e.g. Co) is a potential means to fine-tune the effective aperture size of ZIF-8. Here, we attempt to introduce another metal center, Cd, into ZIF-8 in a facile and scalable manner. Phase-pure Cd-ZIF-8 was successfully synthesized in methanol using a conventional solvothermal method, although it showed a narrow synthesis window. The presence of an organic base (triethylamine, TEA) was found critical not only for the facile synthesis of phase-pure Cd- ZIF-8 but also for the suppression of its phase transformation. A battery of characterizations including single-crystal X-ray structure solutions confirmed that the effective aperture size of Cd-ZIF-8 is the largest among its iso-structures (Zn-ZIF-8 and Co-ZIF-8). Finally, for the first time, mixed-metal CdZn-ZIF-8 crystals with various Cd/Zn ratios were solvothermally synthesized, demonstrating a further opportunity for varying the effective aperture sizes of ZIF-8 and its iso-structures. National Science Foundation Qatar National Research Fund Texas A&M Engineering Experimental Station. |
URI: | http://ri.uaemex.mx/handle20.500.11799/68593 | Other Identifiers: | http://hdl.handle.net/20.500.11799/68593 | Rights: | info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/4.0 |
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