Direct production of o-xylene from six-component BTEXs using a channel-pore interconnected metal-organic framework

IF 19.1 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Chem Pub Date : 2024-11-01 DOI:10.1016/j.chempr.2024.10.006

Xiao-Jing Xie, Heng Zeng, Yong-Liang Huang, Ying Wang, Qi-Yun Cao, Weigang Lu, Dan Li

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Abstract

Metal-organic frameworks (MOFs) with precisely controlled pore dimensions have greatly enriched the versatility of molecular sieving materials. Here, we report a channel-pore interconnected MOF (JNU-2) for direct production of o-xylene from six-component BTEXs (benzene, toluene, ethylbenzene, o-xylene, m-xylene, and p-xylene) in a single adsorption process. Individual adsorption measurements show complete exclusion of o-xylene and benchmark adsorption of other BTEXs. Competitive adsorption studies reveal record-high adsorption selectivity of other BTEXs over o-xylene. Vapor-phase breakthrough experiments verify its superior separation potential for sieving o-xylene from BTEXs. We further demonstrate o-xylene purification by simply soaking JNU-2 (10 g) in BTEXs (18 mL, 90% o-xylene) at room temperature, realizing an average of 15.2 mL of o-xylene (99.5%+ purity, 94% recovery) for 10 cycles. Considering its exceptional stability, JNU-2 may have great promise for energy-efficient o-xylene separation from BTEXs.

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利用槽孔互连金属有机框架从六组分 BTEX 直接生产邻二甲苯

具有精确控制孔隙尺寸的金属有机框架（MOF）极大地丰富了分子筛材料的用途。在此，我们报告了一种通道孔相互连接的 MOF（JNU-2），可在单一吸附过程中直接从六组分 BTEX（苯、甲苯、乙苯、邻二甲苯、间二甲苯和对二甲苯）中生产出邻二甲苯。单个吸附测量结果显示完全排除了邻二甲苯，并对其他 BTEX 进行了基准吸附。竞争性吸附研究表明，对其他 BTEX 的吸附选择性比对邻二甲苯的吸附选择性高得多。气相突破实验验证了它从 BTEXs 中筛分邻二甲苯的卓越分离潜力。我们在室温下将 JNU-2（10 克）简单地浸泡在 BTEXs（18 毫升，90% 的邻二甲苯）中，进一步证明了它的邻二甲苯纯化能力，10 个循环下来，平均可获得 15.2 毫升的邻二甲苯（纯度 99.5%+，回收率 94%）。考虑到其优异的稳定性，JNU-2 在从 BTEXs 中高效节能地分离邻二甲苯方面大有可为。

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来源期刊

Chem Environmental Science-Environmental Chemistry

CiteScore

32.40

自引率

1.30%

发文量

281

期刊介绍： Chem, affiliated with Cell as its sister journal, serves as a platform for groundbreaking research and illustrates how fundamental inquiries in chemistry and its related fields can contribute to addressing future global challenges. It was established in 2016, and is currently edited by Robert Eagling.