An Ideal Molecular Sieve for Acetylene Removal from Ethylene with Record Selectivity and Productivity |
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| Authors: | Bin Li Xili Cui Daniel O'Nolan Hui‐Min Wen Mengdie Jiang Rajamani Krishna Hui Wu Rui‐Biao Lin Yu‐Sheng Chen Daqiang Yuan Huabin Xing Wei Zhou Qilong Ren Guodong Qian Michael J Zaworotko Banglin Chen |
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| Affiliation: | 1. State Key Laboratory of Silicon Materials, Cyrus Tang Center for Sensor Materials and Applications, School of Materials Science and Engineering, Zhejiang University, Hangzhou, China;2. Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, China;3. Bernal Institute, Department of Chemical Sciences, University of Limerick, Limerick, Republic of Ireland;4. Department of Chemistry, University of Texas at San Antonio, San Antonio, TX, USA;5. Van't Hoff Institute for Molecular Sciences, University of Amsterdam, XH, Amsterdam, Netherlands;6. NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD, USA;7. ChemMatCARS, Center for Advanced Radiation Sources, The University of Chicago, Argonne, IL, USA;8. State Key Laboratory of Structure Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, China |
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| Abstract: | Realization of ideal molecular sieves, in which the larger gas molecules are completely blocked without sacrificing high adsorption capacities of the preferred smaller gas molecules, can significantly reduce energy costs for gas separation and purification and thus facilitate a possible technological transformation from the traditional energy‐intensive cryogenic distillation to the energy‐efficient, adsorbent‐based separation and purification in the future. Although extensive research endeavors are pursued to target ideal molecular sieves among diverse porous materials, over the past several decades, ideal molecular sieves for the separation and purification of light hydrocarbons are rarely realized. Herein, an ideal porous material, SIFSIX‐14‐Cu‐i (also termed as UTSA‐200), is reported with ultrafine tuning of pore size (3.4 Å) to effectively block ethylene (C2H4) molecules but to take up a record‐high amount of acetylene (C2H2, 58 cm3 cm?3 under 0.01 bar and 298 K). The material therefore sets up new benchmarks for both the adsorption capacity and selectivity, and thus provides a record purification capacity for the removal of trace C2H2 from C2H4 with 1.18 mmol g?1 C2H2 uptake capacity from a 1/99 C2H2/C2H4 mixture to produce 99.9999% pure C2H4 (much higher than the acceptable purity of 99.996% for polymer‐grade C2H4), as demonstrated by experimental breakthrough curves. |
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| Keywords: | acetylene ethylene purification gas separation molecular sieves porous materials |
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