Compartmentalized Porosity in a Hydrogen-Bonded Organic Framework Enables High-Capacity C<sub>3</sub>H<sub>6</sub>/C<sub>2</sub>H<sub>4</sub> Separation.
basic_science · Level V
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- Record sourced from PubMed, PMID 42223174.
- Also identified by DOI 10.1002/adma.73579.
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Abstract
Hydrogen-bonded organic frameworks (HOFs) are promising adsorbents for gas separation, yet capacity breakthroughs are frequently limited by a pore-architecture trade-off in which increased pore volume is accompanied by cavity expansion and weakened confinement. Herein, we report HOF-BUT-1, constructed from an unprecedented 8-connected linker, resulting in compartmentalized porosity. This HOF thus combines high porosity (pore volume = 0.95 cm<sup>3</sup>/g) with a small largest cavity diameter of 7.6 Å. Enabled by its balanced pore structure, HOF-BUT-1 exhibits a record-high propylene uptake of 8.83 mmol/g at 298 K and 1 bar, and thereby the highest separation potential (ΔQ) of 6.45 mmol/g for equimolar C<sub>3</sub>H<sub>6</sub>/C<sub>2</sub>H<sub>4</sub> mixture among reported HOFs. Dynamic breakthrough experiments can deliver polymer-grade C<sub>2</sub>H<sub>4</sub> (≥99.95%) and C<sub>3</sub>H<sub>6</sub> (≥99.5%) with productivities of 4.79 and 2.88 mmol/g, respectively, and maintain performance over repeated cycles, demonstrating high potential for methanol-to-olefins products upgrading.