Ultrahigh selectivity of benzene/cyclohexane separation by ZIF-8 framework: Insights from spin-probe EPR spectroscopy

Artem S. Poryvaev, Anastasiya A. Yazikova, Daniil M. Polyukhov, Matvey V. Fedin

Результат исследования: Научные публикации в периодических изданияхстатьярецензирование

Аннотация

Liquid-phase separation of cyclohexane and benzene is both demanded and challenging, and the use of selective sorbents, such as metal-organic frameworks (MOFs), for extraction of one component from the mixture is the most promising solution. We report new mechanistic insights into diffusion of benzene and cyclohexane in well-known MOF ZIF-8 using recently developed methodology of encapsulated spin probes detected by Electron Paramagnetic Resonance (EPR). We demonstrate unambiguously that only one component of the hydrocarbons mixture, benzene, can penetrate into ZIF-8 particles, and these EPR-based conclusions are confirmed by high values of sorption selectivity measured by gas chromatography. However, systematic analysis of the mixtures containing small fractions of benzene (e.g. ∼1%) shows noticeable decrease in separation efficiency and only partial removal of benzene from diluted benzene/cyclohexane mixtures. This occurs due to the reverse diffusion of benzene from MOF particles into solution in equilibrium. At the same time, our diffusion study clearly points out that the membrane separation of benzene/cyclohexane using ZIF-8 should be highly perspective and pursued in the future.

Язык оригиналаанглийский
Номер статьи111564
ЖурналMicroporous and Mesoporous Materials
Том330
Ранняя дата в режиме онлайн18 нояб. 2021
DOI
СостояниеОпубликовано - янв. 2022

Предметные области OECD FOS+WOS

  • 2.05 ТЕХНОЛОГИЯ МАТЕРИАЛОВ
  • 1.03 ФИЗИЧЕСКИЕ НАУКИ И АСТРОНОМИЯ
  • 1.04 ХИМИЧЕСКИЕ НАУКИ

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