Hierarchically porous and single Zn atom-embedded carbon molecular sieves for H<sub>2</sub> separations.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 38971823.
- Also identified by DOI 10.1038/s41467-024-49961-z and PMC identifier 11227577.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Hierarchically porous materials containing sub-nm ultramicropores with molecular sieving abilities and microcavities with high gas diffusivity may realize energy-efficient membranes for gas separations. However, rationally designing and constructing such pores into large-area membranes enabling efficient H<sub>2</sub> separations remains challenging. Here, we report the synthesis and utilization of hybrid carbon molecular sieve membranes with well-controlled nano- and micro-pores and single zinc atoms and clusters well-dispersed inside the nanopores via the carbonization of supramolecular mixed matrix materials containing amorphous and crystalline zeolitic imidazolate frameworks. Carbonization temperature is used to fine-tune pore sizes, achieving ultrahigh selectivity for H<sub>2</sub>/CO<sub>2</sub> (130), H<sub>2</sub>/CH<sub>4</sub> (2900), H<sub>2</sub>/N<sub>2</sub> (880), and H<sub>2</sub>/C<sub>2</sub>H<sub>6</sub> (7900) with stability against water vapor and physical aging during a continuous 120-h test.