Significantly Enhanced Separation using ZIF-8 Membranes by Partial Conversion of Calcined Layered Double Hydroxide Precursors.

Yi Liu, Yuan Peng, Nanyi Wang, Yanshuo Li, Jia Hong Pan, Weishen Yang, Jürgen Caro

Index: ChemSusChem 8 , 3582-6, (2015)

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Abstract

Significantly enhanced H2 /CH4 (ca. 80) selectivity was realized by effective suppression of the framework flexibility of a prepared ZIF-8 membrane. Initially a ZnO buffer layer consisting of 20 nm-sized ZnO-nanoparticle aggregates was fabricated by controlled calcination of a ZnAl-NO3 layered double hydroxide membrane. Owing to its high chemical reactivity, the ZnO buffer layer was partially converted into a well-intergrown ZIF-8 membrane with a certain penetration depth upon solvothermal treatment with ligands. Our method may represent a new concept for the design of advanced MOF membranes with high selectivity. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.