Zhang Xin, Cui Hui, Lin Rui-Biao, Krishna Rajamani, Zhang Zhi-Yin, Liu Ting, Liang Bin, Chen Banglin
Beijing Key Laboratory for Green Catalysis and Separation, Department of Environmental Chemical Engineering, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, P. R. China.
Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249-0698, United States.
ACS Appl Mater Interfaces. 2021 May 19;13(19):22514-22520. doi: 10.1021/acsami.1c03923. Epub 2021 May 6.
Ethylene production from oxidative coupling of methane is a sustainable and economically attractive alternative to that through traditional hydrocarbon cracking technology. However, efficient ethylene separation from the complex reaction mixture is a daunting challenge that hinders the practical adoption of this technology. Herein, we report the efficient adsorptive separation of the CH/CO/CH/CH mixture using three representative metal-organic frameworks (MOFs) (UTSA-74, MOF-74, and HKUST-1) with diverse open metal sites. The efficient separation relies on tuning the selectivity through the convergence of characteristics including Lewis acidity of open metal sites, pore space, and cooperative binding behavior. The separation performance of these materials has been evaluated through single-component gas adsorption and dynamic breakthrough experiments. HKUST-1 provides the highest separation potential (4.1 mmol/g) thanks to its simultaneously high ideal adsorbed solution theory (IAST) selectivity and ethylene adsorption capacity, representing a benchmark material for such a challenging quaternary separation.
通过甲烷氧化偶联生产乙烯是一种可持续且在经济上具有吸引力的替代传统烃类裂解技术的方法。然而，从复杂的反应混合物中高效分离乙烯是一项艰巨的挑战，这阻碍了该技术的实际应用。在此，我们报道了使用三种具有不同开放金属位点的代表性金属有机框架（MOF）（UTSA - 74、MOF - 74和HKUST - 1）对CH/CO/CH/CH混合物进行高效吸附分离。这种高效分离依赖于通过开放金属位点的路易斯酸性、孔空间和协同结合行为等特性的协同作用来调节选择性。这些材料的分离性能已通过单组分气体吸附和动态突破实验进行了评估。HKUST - 1由于其同时具有较高的理想吸附溶液理论（IAST）选择性和乙烯吸附容量，提供了最高的分离潜力（4.1 mmol/g），代表了这种具有挑战性的四元分离的基准材料。
