{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T08:28:20Z","timestamp":1787041700147,"version":"build-2736575974"},"reference-count":41,"publisher":"MDPI AG","issue":"16","license":[{"start":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T00:00:00Z","timestamp":1787011200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100002886","name":"CNPC","doi-asserted-by":"publisher","award":["25-LH-33-05-01"],"award-info":[{"award-number":["25-LH-33-05-01"]}],"id":[{"id":"10.13039\/501100002886","id-type":"DOI","asserted-by":"publisher"}]},{"award":["25-LH-33-05-01"],"award-info":[{"award-number":["25-LH-33-05-01"]}],"id":[{"id":"https:\/\/ror.org\/05269d038","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>This study investigates the temperature-responsive thermodynamic behavior of a zinc-based flexible metal\u2013organic framework for ethylene\/ethane C2H4\/C2H6 separation. Isothermal adsorption suggested a highly sensitive, temperature-dependent guest-induced structural transition. At 273 K, C2H4 triggers a pronounced gate-opening effect at low pressures with a broad desorption hysteresis loop, while C2H6 shows only a marginal stepwise uptake increase at about 0.6 bar. Crucially, elevating the temperature to 298 K shifts the C2H4 transition threshold to higher pressures and completely suppresses the C2H6 response. This divergence enables the selective triggering of the framework expansion exclusively by C2H4 at room temperature. Further heating to 323 K entirely suppresses phase-transition characteristics for both gases. Dynamic mixed-gas breakthrough experiments confirm that precise thermal regulation strikes an optimal balance, achieving maximized fixed-bed separation selectivity while preserving a substantial capacity. This work demonstrates temperature as a key parameter to tailor the dynamic separation performance of flexible adsorbents in practical PSA\/TSA applications.<\/jats:p>","DOI":"10.3390\/molecules31162875","type":"journal-article","created":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T08:08:41Z","timestamp":1787040521000},"page":"2875","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Efficient Ethylene\/Ethane Separation Achieved by a Temperature-Responsive Flexible MOF"],"prefix":"10.3390","volume":"31","author":[{"given":"Sheng","family":"Liu","sequence":"first","affiliation":[{"name":"Fundamental Science & Advanced Technology Lab, PetroChina Petrochemical Research Institute, Beijing 102200, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xuefu","family":"Tian","sequence":"additional","affiliation":[{"name":"Fundamental Science & Advanced Technology Lab, PetroChina Petrochemical Research Institute, Beijing 102200, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yutong","family":"Zou","sequence":"additional","affiliation":[{"name":"Fundamental Science & Advanced Technology Lab, PetroChina Petrochemical Research Institute, Beijing 102200, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yanxi","family":"Li","sequence":"additional","affiliation":[{"name":"Fundamental Science & Advanced Technology Lab, PetroChina Petrochemical Research Institute, Beijing 102200, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yawen","family":"Bo","sequence":"additional","affiliation":[{"name":"Fundamental Science & Advanced Technology Lab, PetroChina Petrochemical Research Institute, Beijing 102200, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chuanqi","family":"Wu","sequence":"additional","affiliation":[{"name":"Fundamental Science & Advanced Technology Lab, PetroChina Petrochemical Research Institute, Beijing 102200, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kebin","family":"Chi","sequence":"additional","affiliation":[{"name":"Fundamental Science & Advanced Technology Lab, PetroChina Petrochemical Research Institute, Beijing 102200, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dejun","family":"Shi","sequence":"additional","affiliation":[{"name":"Fundamental Science & Advanced Technology Lab, PetroChina Petrochemical Research Institute, Beijing 102200, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qihan","family":"Gong","sequence":"additional","affiliation":[{"name":"Fundamental Science & Advanced Technology Lab, PetroChina Petrochemical Research Institute, Beijing 102200, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,8,18]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"869","DOI":"10.1021\/cr200190s","article-title":"Metal-Organic Frameworks for Separations","volume":"112","author":"Li","year":"2012","journal-title":"Chem. Rev."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"323","DOI":"10.1021\/cm402897c","article-title":"Hydrocarbon Separations in Metal\u2013Organic Frameworks","volume":"26","author":"Herm","year":"2013","journal-title":"Chem. Mater."},{"key":"ref_3","first-page":"316","article-title":"Seven chemical separations to change the world","volume":"533","author":"Sholl","year":"2016","journal-title":"Nature"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"20874","DOI":"10.1039\/D1TA04096K","article-title":"Separation of alkane and alkene mixtures by metal\u2013organic frameworks","volume":"9","author":"Wang","year":"2021","journal-title":"J. Mater. Chem. A"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"e202300158","DOI":"10.1002\/chem.202300158","article-title":"The Adsorptive Separation of Ethylene from C2 Hydrocarbons by Metal-Organic Frameworks","volume":"29","author":"Xie","year":"2023","journal-title":"Chem.-Eur. J."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"8697","DOI":"10.1038\/ncomms9697","article-title":"Efficient purification of ethene by an ethane-trapping metal-organic framework","volume":"6","author":"Liao","year":"2015","journal-title":"Nat. Commun."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"425","DOI":"10.1016\/j.energy.2005.04.001","article-title":"Olefins from conventional and heavy feedstocks: Energy use in steam cracking and alternative processes","volume":"31","author":"Ren","year":"2006","journal-title":"Energy"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"101","DOI":"10.1007\/s10450-012-9423-1","article-title":"Pure and binary adsorption isotherms of ethylene and ethane on zeolite 5A","volume":"19","author":"Mofarahi","year":"2013","journal-title":"Adsorption"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"116006","DOI":"10.1016\/j.ces.2020.116006","article-title":"Ethylene\/ethane separation by gas-phase SMB in binderfree zeolite 13X monoliths","volume":"229","author":"Seabra","year":"2021","journal-title":"Chem. Eng. Sci."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"125862","DOI":"10.1016\/j.seppur.2023.125862","article-title":"Highly efficient ethylene\/ethane separation via molecular sieving using chitosan-derived ultramicroporous carbon","volume":"333","author":"Huang","year":"2024","journal-title":"Sep. Purif. Technol."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"192","DOI":"10.1016\/j.ces.2017.01.003","article-title":"Asphal-derived high surface area activated porous carbons for the effective adsorption separation of ethane and ethylene","volume":"162","author":"Liang","year":"2017","journal-title":"Chem. Eng. Sci."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"12816","DOI":"10.1021\/jacs.5c20939","article-title":"Stimulus-Induced Microflexible Nanopores in Zinc-Based Coordination Network Enable Four Distinct Adsorption Mechanisms for Efficient Light Hydrocarbon Separations","volume":"148","author":"Li","year":"2026","journal-title":"J. Am. Chem. Soc."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"1606","DOI":"10.1126\/science.1217544","article-title":"Hydrocarbon Separations in a Metal-Organic Framework with Open Iron(II) Coordination Sites","volume":"335","author":"Bloch","year":"2012","journal-title":"Science"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"1128","DOI":"10.1038\/s41563-018-0206-2","article-title":"Molecular sieving of ethylene from ethane using a rigid metal\u2013organic framework","volume":"17","author":"Lin","year":"2018","journal-title":"Nat. Mater."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"16252","DOI":"10.1002\/ange.201808716","article-title":"Molecular Sieving of Ethane from Ethylene Through the Molecular Cross-Section Size Differentiation in Gallate-Based Metal\u2013Organic Frameworks","volume":"130","author":"Bao","year":"2018","journal-title":"Angew. Chem."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"445","DOI":"10.1016\/j.seppur.2015.06.012","article-title":"Ethane\/ethylene separation on a copper benzene-1,3,5-tricarboxylate MOF","volume":"149","author":"Martins","year":"2015","journal-title":"Sep. Purif. Technol."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"443","DOI":"10.1126\/science.aat0586","article-title":"Ethane\/ethylene separation in a metal-organic framework with iron-peroxo sites","volume":"362","author":"Li","year":"2018","journal-title":"Science"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"110","DOI":"10.1016\/j.ces.2017.09.032","article-title":"An ethane-trapping MOF PCN-250 for highly selective adsorption of ethane over ethylene","volume":"175","author":"Chen","year":"2018","journal-title":"Chem. Eng. Sci."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"1477","DOI":"10.1039\/b802426j","article-title":"Selective gas adsorption and separation in metal\u2013organic frameworks","volume":"38","author":"Li","year":"2009","journal-title":"Chem. Soc. Rev."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"836","DOI":"10.1021\/cr200216x","article-title":"Commensurate Adsorption of Hydrocarbons and Alcohols in Microporous Metal Organic Frameworks","volume":"112","author":"Wu","year":"2012","journal-title":"Chem. Rev."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"673","DOI":"10.1021\/cr300014x","article-title":"Introduction to Metal-Organic Frameworks","volume":"112","author":"Zhou","year":"2012","journal-title":"Chem. Rev."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"6774","DOI":"10.1039\/C5CS00307E","article-title":"Multifunctional metal\u2013organic frameworks: From academia to industrial applications","volume":"44","author":"Silva","year":"2015","journal-title":"Chem. Soc. Rev."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"12466","DOI":"10.1021\/acs.chemrev.6b00346","article-title":"Structures of Metal-Organic Frameworks with Rod Secondary Building Units","volume":"116","author":"Schoedel","year":"2016","journal-title":"Chem. Rev."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"9107","DOI":"10.1039\/c2ee22858k","article-title":"Metal\u2013organic frameworks with potential for energy-efficient adsorptive separation of light hydrocarbons","volume":"5","author":"He","year":"2012","journal-title":"Energy Environ. Sci."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"2859","DOI":"10.1039\/C4CC09679G","article-title":"Immobilization of Ag(i) into a metal\u2013organic framework with \u2013SO3H sites for highly selective olefin\u2013paraffin separation at room temperature","volume":"51","author":"Chang","year":"2015","journal-title":"Chem. Commun."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"8654","DOI":"10.1021\/ja502119z","article-title":"Introduction of \u03c0-Complexation into Porous Aromatic Framework for Highly Selective Adsorption of Ethylene over Ethane","volume":"136","author":"Li","year":"2014","journal-title":"J. Am. Chem. Soc."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"85","DOI":"10.1016\/j.cjche.2023.06.001","article-title":"Boosting kinetic separation of ethylene and ethane on microporous materials via crystal size control","volume":"65","author":"Ma","year":"2024","journal-title":"Chin. J. Chem. Eng."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"12093","DOI":"10.1021\/am502686g","article-title":"Ethane Selective IRMOF-8 and Its Significance in Ethane-Ethylene Separation by Adsorption","volume":"6","author":"Pires","year":"2014","journal-title":"ACS Appl. Mater. Interfaces"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"e202418853","DOI":"10.1002\/anie.202418853","article-title":"Ethane Triggered Gate-Opening in a Flexible-Robust Metal-Organic Framework for Ultra-High Purity Ethylene Purification","volume":"64","author":"Zhang","year":"2025","journal-title":"Angew. Chem. Int. Ed."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"21389","DOI":"10.1039\/C7TA03755D","article-title":"Gate opening effect of zeolitic imidazolate framework ZIF-7 for adsorption of CH4 and CO2 from N2","volume":"5","author":"Birkett","year":"2017","journal-title":"J. Mater. Chem. A"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"360","DOI":"10.1016\/j.cej.2017.07.044","article-title":"Efficient adsorptive separation of C3H6 over C3H8 on flexible and thermoresponsive CPL-1","volume":"328","author":"Chen","year":"2017","journal-title":"Chem. Eng. J."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"4820","DOI":"10.1039\/C7DT04134A","article-title":"Selective carbon dioxide sorption by a new breathing three-dimensional Zn-MOF with Lewis basic nitrogen-rich channels","volume":"47","author":"Kim","year":"2018","journal-title":"Dalton Trans."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"22756","DOI":"10.1002\/anie.202011802","article-title":"Tuning Gate-Opening of a Flexible Metal-Organic Framework for Ternary Gas Sieving Separation","volume":"59","author":"Dong","year":"2020","journal-title":"Angew. Chem. Int. Ed."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"5025","DOI":"10.1021\/acs.inorgchem.1c03931","article-title":"Identifying the Gate-Opening Mechanism in the Flexible Metal\u2013Organic Framework UTSA-300","volume":"61","author":"Acharya","year":"2022","journal-title":"Inorg. Chem."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"542","DOI":"10.1038\/s41557-022-01128-3","article-title":"Reversible transformations between the non-porous phases of a flexible coordination network enabled by transient porosity","volume":"15","author":"Nikolayenko","year":"2023","journal-title":"Nat. Chem."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"4153","DOI":"10.1021\/jacs.3c13117","article-title":"Ethane\/Ethylene Separations in Flexible Diamondoid Coordination Networks via an Ethane-Induced Gate-Opening Mechanism","volume":"146","author":"Wang","year":"2024","journal-title":"J. Am. Chem. Soc."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"3145","DOI":"10.1021\/acs.inorgchem.3c04267","article-title":"Flexible Microporous Framework for One-Step Acquisition of Ethylene from Ternary C2 Hydrocarbons","volume":"63","author":"Zhang","year":"2024","journal-title":"Inorg. Chem."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"e202508419","DOI":"10.1002\/anie.202508419","article-title":"Engineering the Microporous Environment of Flexible Metal-Organic Frameworks with Bifunctionality for Promoting the Separation of Ethylene from a Ternary Mixture","volume":"64","author":"Wang","year":"2025","journal-title":"Angew. Chem. Int. Ed."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"29255","DOI":"10.1021\/jacs.5c08726","article-title":"Two-in-One Flexible Metal-Organic Framework: One-Step C2H4 Purification via Inverse C2H6-C2H4 and C2H2-CO2 Separations","volume":"147","author":"Mukherjee","year":"2025","journal-title":"J. Am. Chem. Soc."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"e202317648","DOI":"10.1002\/anie.202317648","article-title":"High-Pressure Molecular Sieving of High-Humidity C2H4\/C2H6 Mixture by a Hydrophobic Flexible Metal-Organic Framework","volume":"63","author":"Zhang","year":"2024","journal-title":"Angew. Chem. Int. Ed."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"182","DOI":"10.1016\/j.molstruc.2014.09.081","article-title":"Construction of two new Zn(II)-guanazole frameworks varying organic carboxylate ligands","volume":"1081","author":"Cui","year":"2015","journal-title":"J. Mol. 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