Fabrication of robust zirconium metal-organic frameworks for efficient C3H6/C2H4 separation

Hang Ou Qi, Fan Li, Hua Dong Li, Xiao Qin Liu, Guoliang Liu, Lin Bing Sun

科研成果: 期刊稿件文章同行评审

摘要

Adsorption separation of C3H6/C2H4 mixtures has garnered significant attention owing to its immense potential to reduce energy consumption. To further advance this process, the key lies in the construction of adsorbents with excellent separation performance. Herein, we report the synthesis of a zirconium-based metal–organic framework (MOF) material, UiO-68-2CH2OCH3, which was isostructural to UiO-68 and possesses a high specific surface area of up to 3133 m2·g−1 together with high pore volume up to 1.63 cm3·g−1, attributes that enable its high capacity for C3H6. The C3H6 adsorption capacity of UiO-68-2CH2OCH3 reached 238.7 cm3·g−1 at 298 K, which is comparable to the top-performing MOFs, and the C3H6/C2H4 (v: v = 50:50) selectivity at 298 K and 100 kPa was calculated to be 6.6. The corresponding separation potential can be up to 5.0 mmol·g−1. Dynamic breakthrough experiments on UiO-68-2CH2OCH3 confirm its efficient separation of C3H6/C2H4 under actual dynamic conditions, with the breakthrough time remaining virtually unchanged over five cycles. The GCMC simulations further reveal that the more C-H···π interactions and hydrogen bond interactions with methoxymethyl groups in UiO-68-2CH2OCH3 facilitate the affinity for C3H6. In addition, UiO-68-2CH2OCH3 displayed fine stability across a range of pH conditions. Therefore, this project not only provides a promising candidate for the separation of the C3H6/C2H4 mixture but also provides empirical guidance for the construction of high-performance adsorbents.

源语言英语
文章编号132848
期刊Separation and Purification Technology
367
DOI
出版状态已出版 - 7 9月 2025

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