(376w) Rapid Synthesis of Hybrid Zeolitic-Imidazolate Frameworks (ZIFs) Membranes with Tunable Gas Separations
AIChE Annual Meeting
2018
2018 AIChE Annual Meeting
Separations Division
Poster Session: Separations Division
Tuesday, October 30, 2018 - 3:30pm to 5:00pm
Here, we plan to present a rapid microwave-assisted in situ synthesis of well-intergrown mixed linker ZIF-7-8 membranes in under â¼90 s.16 ZIF-7-8 consists of Zn2+ metal nodes bridged by a mixture of benzimidazolate (bIm, ZIF-7 linker) and 2-methylimidazolate (mIm, ZIF-8 linker) linkers.15 To the best of our knowledge, this is the fastest synthesis of any polycrystalline MOF membranes reported up to now. Furthermore, the gas separation performances (separation factor and permeance) of hybrid ZIF-7-8 membranes were systematically tuned by varying the bIm-to-mIm ratio incorporated into the framework. This is attributed to the fact that an increase in bulky benzimidazolate linker incorporation reduces the effective aperture size of the hybrid framework, consequently improving the separation factor at the expense of reduction in permeance. The unprecedentedly rapid synthesis of ZIF-7-8 membranes with tunable molecular sieving properties is an important step forward for their practical applications in the separation of gas mixtures of interest.
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