The unique adsorptive properties of metal–organic frameworks open the door to new processes for energy and raw materials production. One such process is the oxidative coupling of methane for the generation of ethylene, which has limited viability due to the high cost of cryogenic distillation. Rather than employing such a traditional separation route, we propose the use of a porous material that is highly selective for ethylene over a wide range of gases in an energy- and cost-effective adsorbent-based separation process. Here, we analyze the metal–organic frameworks M₂(m-dobdc) (M = Mg, Mn, Fe, Co, Ni; m-dobdc⁴⁻ = 4,6-dioxido-1,3-benzenedicarboxylate), featuring a high density of coordinatively-unsaturated M²⁺ sites, along with the commercial adsorbent zeolite CaX, for their ability to purify ethylene from the effluent of an oxidative coupling of methane process. Our results show that unique metal–adsorbate interactions facilitated by Mn₂(m-dobdc) render this material an outstanding adsorbent for the capture of ethylene from the product mixture, enabling this potentially disruptive alternative process for ethylene production.

中文翻译：

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通过在金属-有机骨架的Mn其选择性吸附能够替代乙烯生产₂（米-dobdc）†

金属有机骨架的独特吸附性能为能源和原材料生产的新工艺打开了大门。一种这样的方法是甲烷的氧化偶联以产生乙烯，由于低温蒸馏的高成本，其具有有限的生存能力。与其采用这种传统的分离途径，我们建议在基于能量和成本效益的基于吸附剂的分离过程中，使用对多种气体具有高度选择性的乙烯的多孔材料。在这里，我们分析了金属-有机骨架M ₂（m -dobdc）（M = Mg，Mn，Fe，Co，Ni；m -dobdc ^4- = 4,6-dioxido-1,3-苯二甲酸），其特征为高密度的配位不饱和M ²⁺位置，以及商用吸附剂沸石CaX，因为它们具有从甲烷氧化偶联反应的废水中提纯乙烯的能力。我们的结果表明，Mn ₂（m -dobdc）促进的独特的金属-吸附物相互作用使该材料成为从产物混合物中捕获乙烯的杰出吸附剂，从而使该潜在的破坏性生产乙烯的方法成为可能。