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<p>Efficient separation of propylene from propane is a critical yet challenging industrial process. While rigid molecular sieves offer ideal selectivity, their narrow nanopores inherently constrain adsorption capacity and diffusion kinetics due to compromised thermodynamic-kinetic trade-offs. To address this, we report ZSTU-10, a molecular sieve constructed via structure-directing agents. Uniquely, ZSTU-10 features localized sieving gates for selective guest admission, expansive diffusion channels for rapid transport, and central pore cavities for high-capacity storage. This gate-channel-cavity architecture enables the precise exclusion of propane while facilitating the dense packing and fast diffusion of propylene, achieving simultaneous thermodynamic-kinetics optimization in molecular sieving. Static adsorption experiments demonstrate an exceptional propylene uptake (97.7 cm<sup>3 </sup>cm<sup>-3</sup>) at 298 K and 1 bar. Time-dependent uptake kinetics revealed a propylene diffusion coefficient (4.29 × 10<sup>-9 </sup>cm<sup>2 </sup>s<sup>-1</sup>) in ZSTU-10 surpassing benchmarks by two orders of magnitude. Dynamic breakthrough experiments demonstrate that ZSTU-10 produces high-purity propylene (99.1%) with a productivity of 37.5 L kg<sup>−1</sup> in a single adsorption-desorption cycle.</p>

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Microporous MOF for simultaneous high thermodynamic and kinetic synergistic separation of propylene and propane

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月23日

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  • Xue Wang,
  • Lingxiang Bao,
  • Jing-Hong Li,
  • Tao Zhao,
  • Libo Li,
  • Shuki Torii,
  • Hongwei Chen,
  • Takashi Kamiyama,
  • Ping Miao,
  • Rui-Biao Lin,
  • Banglin Chen,
  • Junkuo Gao

摘要

Efficient separation of propylene from propane is a critical yet challenging industrial process. While rigid molecular sieves offer ideal selectivity, their narrow nanopores inherently constrain adsorption capacity and diffusion kinetics due to compromised thermodynamic-kinetic trade-offs. To address this, we report ZSTU-10, a molecular sieve constructed via structure-directing agents. Uniquely, ZSTU-10 features localized sieving gates for selective guest admission, expansive diffusion channels for rapid transport, and central pore cavities for high-capacity storage. This gate-channel-cavity architecture enables the precise exclusion of propane while facilitating the dense packing and fast diffusion of propylene, achieving simultaneous thermodynamic-kinetics optimization in molecular sieving. Static adsorption experiments demonstrate an exceptional propylene uptake (97.7 cm3 cm-3) at 298 K and 1 bar. Time-dependent uptake kinetics revealed a propylene diffusion coefficient (4.29 × 10-9 cm2 s-1) in ZSTU-10 surpassing benchmarks by two orders of magnitude. Dynamic breakthrough experiments demonstrate that ZSTU-10 produces high-purity propylene (99.1%) with a productivity of 37.5 L kg−1 in a single adsorption-desorption cycle.