A zeolitic imidazolate framework (ZIF-8) as member of the metal-organic framework family has been crystallized as a thin porous layer on an asymmetric ceramic support. Hydrogen can be selected from other gases by molecular sieving.

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Membranes derived from metal-organic frameworks present a new category of molecular sieves. As demonstrated by Y. Li., J. Caro et al. in their Communication on page 548 ff., a supported zeolitic imidazolate framework (ZIF-7) membrane exhibits high H 2 selectivity by serving as a molecular sieve. The picture shows the synthesis of the ZIF-7 membrane which includes surface seeding and microwave-assisted solvothermal synthesis.

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