{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,23]],"date-time":"2026-10-23T12:58:50Z","timestamp":1792760330125,"version":"4.5.0"},"reference-count":74,"publisher":"MDPI AG","issue":"14","license":[{"start":{"date-parts":[[2025,7,11]],"date-time":"2025-07-11T00:00:00Z","timestamp":1752192000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["22478229"],"award-info":[{"award-number":["22478229"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Nanomaterials"],"abstract":"<jats:p>Understanding the adsorption mechanism is essential for developing efficient technologies to capture carbon dioxide from industrial flue gases. In this work, laboratory measurements, density functional theory calculations, and molecular dynamics simulations were employed to study CO2 adsorption and diffusion behavior in LTA-type zeolites. The CO2 adsorption isotherms measured in zeolite 5A are best described by the Toth model. Thermodynamic analysis indicates that the adsorption process is spontaneous and exothermic, with an enthalpy change of \u221244.04 kJ\/mol, an entropy change of \u2212115.23 J\/(mol\u00b7K), and Gibbs free energy values ranging from \u22129.68 to \u22121.03 kJ\/mol over the temperature range of 298\u2013373 K. The isosteric heat of CO2 adsorption decreases from 40.35 to 21.75 kJ\/mol with increasing coverage, reflecting heterogeneous interactions at Ca2+ and Na+ sites. The adsorption kinetics follow a pseudo-first-order model, with an activation energy of 2.24 kJ\/mol, confirming a physisorption mechanism. The intraparticle diffusion model indicates that internal diffusion is the rate-limiting step, supported by a significant reduction in the diffusion rate. The DFT calculations demonstrated that CO2 exhibited a \u221235 kJ\/mol more negative adsorption energy in zeolite 5A than in zeolite ITQ-29, attributable to strong interactions with Ca2+\/Na+ cations in 5A that were absent in the pure silica ITQ-29 framework. The molecular dynamics simulations based on molecular force fields indicate that CO2 diffuses more rapidly in ITQ-29, with a diffusion coefficient measuring 2.54 \u00d7 10\u22129 m2\/s at 298 K, whereas it was 1.02 \u00d7 10\u22129 m2\/s in zeolite 5A under identical conditions. The activation energy for molecular diffusion reaches 5.54 kJ\/mol in zeolite 5A, exceeding the 4.12 kJ\/mol value in ITQ-29 by 33%, which accounts for the slower diffusion kinetics in zeolite 5A. There is good agreement between experimental measurements and molecular simulation results for zeolite 5A across the studied temperature and pressure ranges. This confirms the accuracy and reliability of the selected simulation parameters and allows for the study of zeolite ITQ under similar simulation conditions. This research provides insights into CO2 adsorption energetics and diffusion within LTA-type zeolite frameworks, supporting the rational design of high-performance adsorbents for industrial gas separation.<\/jats:p>","DOI":"10.3390\/nano15141077","type":"journal-article","created":{"date-parts":[[2025,7,11]],"date-time":"2025-07-11T10:26:53Z","timestamp":1752229613000},"page":"1077","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["Insights into the Adsorption of Carbon Dioxide in Zeolites ITQ-29 and 5A Based on Kinetic Measurements and Molecular Simulations"],"prefix":"10.3390","volume":"15","author":[{"given":"Magdy Abdelghany","family":"Elsayed","sequence":"first","affiliation":[{"name":"College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China"},{"name":"Department of Mining and Petroleum Engineering, Faculty of Engineering, Al-Azhar University, Cairo 11884, Egypt"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shixue","family":"Zhou","sequence":"additional","affiliation":[{"name":"College of Chemical and Biological Engineering, Shandong University of Science and Technology, Qingdao 266590, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaohui","family":"Zhao","sequence":"additional","affiliation":[{"name":"College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gumawa Windu","family":"Manggada","sequence":"additional","affiliation":[{"name":"College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhongyuan","family":"Chen","sequence":"additional","affiliation":[{"name":"College of Chemical and Biological Engineering, Shandong University of Science and Technology, Qingdao 266590, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fang","family":"Wang","sequence":"additional","affiliation":[{"name":"College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhijuan","family":"Tang","sequence":"additional","affiliation":[{"name":"College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,7,11]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"253","DOI":"10.1038\/s43017-024-00532-2","article-title":"Global carbon emissions in 2023","volume":"5","author":"Liu","year":"2024","journal-title":"Nat. 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