在化工生产中，从复杂混合物里提纯目标分子是个老大难问题，通常需要一系列高能耗的分离单元。以从炼厂干气中提纯乙烯为例，传统的分离方法，比如依据分子大小或官能团来区分分子的机制，往往难以实现精准的分子识别和吸附，因为它们获取的分子信息不够全面。不过，科学家们发现了一种全新的互补吸附机制。这种机制通过表面静电势和分子形状来区分分子，能更全面地涵盖分子的物理和化学性质，从而实现精准的分子识别。基于这个机制，科研人员构建了一种新型多孔材料 ZU - 501。它对乙烯具有静电势和形状的互补性，能够从包括 C1 - C4 烷烃、烯烃以及二氧化碳等典型的乙烯混合物中特异性地吸附乙烯。通过放大穿透实验和变压吸附模拟，证实了 ZU - 501 从炼厂干气中一步回收乙烯的实际应用潜力。这项研究为不同场景下低浓度乙烯资源的高效利用开辟了重要途径，未来有望在化工领域发挥重要作用，让乙烯的分离和提纯变得更加高效、节能。

期刊

JACS

标题

Complementary Adsorption within Metal–Organic Frameworks for Ethylene Upgrading from Refinery Dry Gas

作者

Tangyin Wu,Dengzhuo Zhou,Zhenglu Yang,Yechen Liu, Pengyuan Yin, Kun Lu, Fangyao Jiang, Fangyao Jiang, Xian Suo, Lifeng Yang, Xili Cui, and Huabin Xing

摘要

Molecule-specific adsorption offers an efficient approach for target molecule purification from complex mixtures that demand a series of energy-intensive separation units. However, existing separation mechanisms that discriminate molecular sizes or functional groups are generally unable to achieve molecule-specific adsorption due to insufficiently identified molecular information. We reveal the complementary adsorption mechanism that discriminates molecules through surface electrostatic potential and molecular shape, covering more comprehensive physical and chemical molecular properties, and realizing precise molecular recognition. The constructed novel porous material ZU-501, which exhibits electrostatic potential and shape complementarity toward ethylene, first realizes ethylene-specific adsorption from typical ethylene mixtures, including C1–C4 paraffins and olefins, and carbon dioxide. The practical use potential of ZU-501 for one-step ethylene recovery from a refinery dry gas is validated by scale-up breakthrough experiments and pressure swing adsorption modeling. This work paves an important avenue for the efficient utilization of low-concentration ethylene resources from diverse scenarios.

原文链接

https://pubs.acs.org/doi/10.1021/jacs.5c18112

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