Highly Efficient Separation of Hexane Isomers by Rigid-Flexible Pyrazine-Pillar Ultramicroporous Metal–Organic Framework

IF 9.6 1区化学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

ACS Materials Letters Pub Date : 2025-03-13 DOI:10.1021/acsmaterialslett.5c0005510.1021/acsmaterialslett.5c00055

Ting Wang, Liang Yu, Mao Ye, Chenghua Deng, En Lin, Yu Zhang, Kaiyuan Wang, Shubo Geng*, Yao Chen, Peng Cheng, Zhihua Qiao, Hao Wang and Zhenjie Zhang*,

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Abstract

Separating linear, monobranch, and dibranch alkanes is a pivotal process in the petrochemical industry. Herein, we present an ultramicroporous metal–organic framework (MOF) with a rigid-flexible structure. Single-component adsorption isotherms demonstrate that this MOF exhibited high capacities for hexane (nHEX) and 3-methylpentane (3MP), whereas excluding 2,2-dimethylbutane (22DMB), resulting in remarkable uptake ratios for nHEX/22DMB (19.2) and 3MP/22DMB (12.6) at 303 K, surpassing those of most reported MOFs. Breakthrough results with the nHEX/3MP/22DMB ternary mixture further validate its excellent separation performance and good reusability. Single-crystal structure data of MOF adsorbing gas molecules reveal that the outstanding performance can be ascribed to its suitable pore size and guest-induced flexibility, with an adaptive backbone triggered by nHEX and 3MP, leading to strong affinities for these molecules and precisely locating their positions within the framework.

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刚柔吡嗪柱超微孔金属-有机骨架高效分离己烷异构体

分离线性烷烃、单支烷烃和二支烷烃是石化工业中的一项关键工艺。在此，我们介绍了一种具有刚柔结合结构的超微孔金属有机框架（MOF）。单组分吸附等温线表明，这种 MOF 对正己烷（nHEX）和 3-甲基戊烷（3MP）具有很高的吸附容量，但不包括 2,2-二甲基丁烷（22DMB），因此在 303 K 时，nHEX/22DMB（19.2）和 3MP/22DMB （12.6）的吸附比非常显著，超过了大多数已报道的 MOF。nHEX/3MP/22DMB 三元混合物的突破性结果进一步验证了其卓越的分离性能和良好的重复使用性。MOF 吸附气体分子的单晶结构数据显示，其出色的性能可归因于其合适的孔径和客体诱导的柔性，nHEX 和 3MP 触发的自适应骨架使其对这些分子具有很强的亲和力，并能精确定位它们在框架中的位置。

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来源期刊

ACS Materials Letters MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

14.60

自引率

3.50%

发文量

261

期刊介绍： ACS Materials Letters is a journal that publishes high-quality and urgent papers at the forefront of fundamental and applied research in the field of materials science. It aims to bridge the gap between materials and other disciplines such as chemistry, engineering, and biology. The journal encourages multidisciplinary and innovative research that addresses global challenges. Papers submitted to ACS Materials Letters should clearly demonstrate the need for rapid disclosure of key results. The journal is interested in various areas including the design, synthesis, characterization, and evaluation of emerging materials, understanding the relationships between structure, property, and performance, as well as developing materials for applications in energy, environment, biomedical, electronics, and catalysis. The journal has a 2-year impact factor of 11.4 and is dedicated to publishing transformative materials research with fast processing times. The editors and staff of ACS Materials Letters actively participate in major scientific conferences and engage closely with readers and authors. The journal also maintains an active presence on social media to provide authors with greater visibility.