Adsorption最新文献

{"title":"A reference low-pressure CO2 adsorption isotherm for zeolite 13X: results of an interlaboratory study","authors":"Huong Giang T. Nguyen,&nbsp;David Newton,&nbsp;Riaz Ahmad,&nbsp;Carsten Prinz,&nbsp;Mario Zorrilla-Valtierra,&nbsp;Krista S. Walton,&nbsp;Killian Gmyrek,&nbsp;Ronny Pini,&nbsp;Camille Petit,&nbsp;Marcus Lange,&nbsp;Jens Mӧllmer,&nbsp;Evelyn Fuhrmann,&nbsp;Katharina Volz,&nbsp;Garrett Taggart,&nbsp;Andreas Schreiber,&nbsp;Yuko Konishi,&nbsp;Kazuyuki Nakai,&nbsp;Christos Tampaxis,&nbsp;Theodore Steriotis,&nbsp;Hai Wang,&nbsp;Charles David Brewster,&nbsp;Mi Tian,&nbsp;Rajan Jagpal,&nbsp;Siyi Liu,&nbsp;George Neville,&nbsp;Sunanda Sain,&nbsp;Timothy Mays,&nbsp;Riccardo Rea,&nbsp;Enzo Mangano,&nbsp;Stefano Brandani,&nbsp;Maxwell Tsipoaka,&nbsp;Fateme Rezaei,&nbsp;Adrien Houzé,&nbsp;Nicolas Heymans,&nbsp;Guy De Weireld,&nbsp;Charles E. Holland,&nbsp;Armin D. Ebner,&nbsp;James A. Ritter","doi":"10.1007/s10450-026-00701-3","DOIUrl":"10.1007/s10450-026-00701-3","url":null,"abstract":"<div><p>This paper reports the results of an international interlaboratory study sponsored by the Versailles Project on Advanced Materials and Standards (VAMAS) and led by the National Institute of Standards and Technology (NIST) on the measurement of low-pressure CO₂ adsorption isotherms at 25 °C on zeolite 13X (NIST research grade test material 10257). Eighteen laboratories participated in the study and contributed 21 datasets. From these data, a consensus reference isotherm, along with the 95% uncertainty interval (<i>U</i>_<i>k=2</i>), were determined and reported. Results indicate the material is suitable for development into NIST reference material, which will become the first zeolitic reference material in beaded form at NIST.</p></div>","PeriodicalId":458,"journal":{"name":"Adsorption","volume":"32 7","pages":""},"PeriodicalIF":3.3,"publicationDate":"2026-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10450-026-00701-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148838211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microscopic occurrence and pore-scale diffusion behavior of water-soluble sodium in coal","authors":"Quanbao Wen,&nbsp;Shengyu Liu,&nbsp;Jianying Guo","doi":"10.1007/s10450-026-00706-y","DOIUrl":"10.1007/s10450-026-00706-y","url":null,"abstract":"<div><p>The occurrence modes of water-soluble sodium (WS-Na) in coal critically govern its migration, release, and removal during cleaning, pyrolysis, and combustion, yet its microscopic distribution within pore structures and interaction mechanisms with water and the coal matrix remain elusive. To bridge this gap, we integrated scanning electron microscopy–energy dispersive X-ray spectroscopy (SEM-EDS), X-ray photoelectron spectroscopy (XPS), and molecular dynamics (MD) simulations to systematically probe H₂O, Na⁺, and Cl⁻ diffusion across coals of varying porosities. Our findings reveal that Na⁺ and Cl⁻ weaken coal-water interactions—an effect exacerbated at higher porosities where ions become sequestered in larger pores distant from active surface sites. Although these ions disrupt the water hydrogen-bond network, strong ion-water electrostatics dominate, fostering the formation of larger hydrated clusters that drive saline accumulation into coal slit pores. H₂O molecules rapidly migrate to and adsorb onto the coal surface, attracting Cl⁻ to regions near hydrogen atoms of surface functional groups. Concurrently, Na⁺ preferentially localizes adjacent to oxygen-containing (e.g., –COOH, –OH) and nitrogen-containing moieties, forming ion pairs with Cl⁻ via Coulombic attraction. Notably, the diffusivities of Na⁺ and Cl⁻ increase with porosity, reflecting the relaxation of nanoconfinement effects; in contrast, the effective diffusivity of H₂O decreases with increasing porosity under saline conditions, likely due to enhanced tortuosity and prolonged surface residence time in more complex pore networks. This work establishes a mechanistic framework for alkali metal speciation and transport in coal, providing a theoretical basis for optimizing pretreatment strategies to mitigate slagging, fouling, and corrosion during thermal conversion.</p></div>","PeriodicalId":458,"journal":{"name":"Adsorption","volume":"32 7","pages":""},"PeriodicalIF":3.3,"publicationDate":"2026-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Statistical physics and thermodynamic evaluation of CO2-activated carbon pairs for cooling cycle","authors":"Wouroud Sghaier,&nbsp;Yosra Ben Torkia,&nbsp;Fatma Aouaini,&nbsp;Abdelmottaleb Ben Lamine","doi":"10.1007/s10450-026-00703-1","DOIUrl":"10.1007/s10450-026-00703-1","url":null,"abstract":"<div><p>The growing demand for efficient and sustainable thermal management technologies has intensified research on adsorption-based refrigeration systems. In this study, CO₂ adsorption on two highly microporous activated carbons, Maxsorb III and ACF-A20, is investigated using a grand canonical statistical physics (GCSP) framework to provide a detailed thermodynamic and energetic description of the process. The monolayer model with a single effective energy provides an excellent representation of the experimental isotherms and allows the determination of key physicochemical parameters, including site occupancy, density of accessible adsorption sites, saturation capacity, and adsorption energy. The results indicate that CO₂ adsorption is predominantly governed by physisorption within confined porous structures. The temperature dependence of the model parameters shows a systematic decrease in site occupancy, accompanied by enhanced site accessibility and reduced saturation capacity, reflecting the combined influence of thermal agitation and confinement effects. Based on the derived adsorption framework, thermodynamic functions such as internal energy, enthalpy, and Helmholtz free energy are evaluated as functions of pressure and temperature, confirming the spontaneous and exothermic nature of the adsorption process and its relevance for thermal energy storage and conversion applications. Furthermore, these thermodynamic insights are applied to assess the performance of two adsorption refrigeration cycle configurations. At 363 K, the predicted coefficients of performance (COP) are 0.59 and 0.89 for cycle I, and 0.79 and 0.64 for cycle II, for Maxsorb III and ACF-A20, respectively. Overall, this work highlights the capability of statistical physics modeling to bridge microscopic adsorption mechanisms with macroscopic thermal system performance, providing useful guidelines for the design and optimization of advanced adsorption cooling systems.</p></div>","PeriodicalId":458,"journal":{"name":"Adsorption","volume":"32 6","pages":""},"PeriodicalIF":3.3,"publicationDate":"2026-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing light olefin recovery using eco-friendly MIL-100(Fe) adsorptive processes","authors":"Paulo Carmo,&nbsp;Ana M. Ribeiro,&nbsp;Alírio E. Rodrigues,&nbsp;Alexandre Ferreira","doi":"10.1007/s10450-026-00705-z","DOIUrl":"10.1007/s10450-026-00705-z","url":null,"abstract":"<div><p>The applicability of the environmentally friendly MIL-100(Fe) metal-organic framework is explored for the recovery of unreacted monomers from nitrogen-rich vent streams generated in the two highest-volume thermoplastics industries: polyethylene and polypropylene. Adsorption equilibrium isotherms for ethylene and propylene were measured at multiple temperatures and fitted using the Langmuir model. Breakthrough experiments were conducted for ethylene/nitrogen and propylene/nitrogen mixtures using a bench-scale fixed-bed unit. Simulations using a dynamic fixed-bed model accurately reproduced the experimental data, validating both the kinetic and multicomponent equilibrium behavior of the system. Industrial-scale Pressure Swing Adsorption (PSA) and Multitubular Temperature and Pressure-Swing Adsorption (MT-TPSA) separation systems were designed, and evaluated. For ethylene recovery, a three-column PSA cycle operating between 0.3 and 9 bar at 343 K is recommended. This system achieved a productivity of 2.23 mol/(kg·h) and a recovery capacity of 21.0 kg C₂H₄/(m³·h) with a total energy consumption of 10.13 MJ/kg_C2H4. For propylene recovery, both a PSA cycle (0.3–8 bar, 343 K) and a MT-TPSA cycle (1–5 bar, 303–393 K) are considered. The MT-TPSA process offered higher productivity (6.72 mol/(kg·h)) and recovery capacity (38.9 kg C₃H₆/(m³·h)), though at a higher total energy cost of 7.46 MJ/kg C₃H₆ compared to 4.37 MJ/kg C₃H₆ for PSA, with a productivity of 1.48 mol/(kg·h) and recovery capacity of 21.03 kg C₃H₆/(m³·h).</p></div>","PeriodicalId":458,"journal":{"name":"Adsorption","volume":"32 6","pages":""},"PeriodicalIF":3.3,"publicationDate":"2026-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148615045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Micropore-engineered activated carbons from sunflower pith for enhanced CO2 capture","authors":"Sahand Saeidi Harzand,&nbsp;Alp Yürüm","doi":"10.1007/s10450-026-00704-0","DOIUrl":"10.1007/s10450-026-00704-0","url":null,"abstract":"<div><p>Biomass-derived activated carbons are attractive adsorbents for carbon dioxide capture because they combine low precursor cost, chemical robustness, moisture tolerance, and tunable microporosity. Here, sunflower stem pith, an agricultural residue with a naturally porous cellular structure, was converted to activated carbon through nitrogen carbonization followed by alkali hydroxide activation using either KOH or NaOH. Carbonization temperature and time-controlled char yield, and the progressive removal of lignocellulosic functional groups, while the activation chemistry determined the final pore architecture. The highest BET surface area was obtained for the NaOH-activated sample prepared from the 500 °C/120 min char (AC-4, 2948 m²g^− 1), whereas the corresponding KOH-activated sample (AC-2) showed a lower BET surface area (2268 m²g^− 1) but a higher micropore-to-total-pore-volume ratio (0.78) and a smaller average pore diameter (2.08 nm). CO₂ adsorption measurements at 25 °C up to 8 bar demonstrated that AC-2 outperformed the NaOH-activated analogues and the commercial activated carbon, reaching 13.92 mmol g^− 1 at 8 bar, compared with 10.87 mmol g^− 1 for AC-4 and 4.58 mmol g^− 1 for the commercial sample. The adsorption capacity decreased with increasing temperature, and the isosteric heat analysis was consistent with exothermic physisorption. These findings show that the CO₂-capture performance of biomass-derived activated carbons should be optimized by pore-size engineering and micropore accessibility rather than by BET surface area alone. Sunflower pith is therefore a promising regional precursor for low-cost carbon adsorbents, especially for pressure-swing adsorption scenarios where high-pressure working capacity is important.</p></div>","PeriodicalId":458,"journal":{"name":"Adsorption","volume":"32 6","pages":""},"PeriodicalIF":3.3,"publicationDate":"2026-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Extensive textural characterization of ash-rich chars produced by one-step activation of biomass under pure CO2 atmosphere","authors":"Florent Thevenon,&nbsp;Philippe Bernard Himbane,&nbsp;Wassim Sebai,&nbsp;Sylène Monnier,&nbsp;Luisa Julieth Parra-Serrano,&nbsp;Stéphane Boivin,&nbsp;Olivier Taugourdeau,&nbsp;Hassan Boukcim,&nbsp;Alfredo Napoli,&nbsp;Nicolas Brun","doi":"10.1007/s10450-026-00700-4","DOIUrl":"10.1007/s10450-026-00700-4","url":null,"abstract":"<div><p>In this study, activated carbons (ACs) were produced through a one-step physical activation of raw biomasses (distilled mint, chestnut wood, chestnut leaves) in pure CO₂ atmosphere. The biomasses were activated without any pretreatment. The textural properties of the ACs were characterized with N₂ and CO₂ adsorption measurements, and advanced models such as Dubinin-Astakhov (DA) equation and 2D-NLDFT model were applied to provide a comprehensive understanding of the porosity development of the ACs. Highly microporous ACs were successfully produced from distilled mint through one-step activation (up to 937 m²/g). The evolution of the specific surface area as a function of activation degree of the resource follows a bell-shaped curve, with an optimum that depends on the nature of the resource. Regarding the pore size distribution, both the DA and 2D-NLDFT models agree that micropore heterogeneity increases as activation progresses. Finally, this study highlights the challenges associated with applying advanced adsorption-based textural characterization methods to ash-rich, heterogeneous biomass-derived chars. A discrepancy was observed between the CO₂ adsorption data and the 2D-NLDFT and DA models for highly activated chars. These deviations indicate that adsorption behavior is likely governed by multiple interrelated factors, potentially arising from the presence of heterogeneous inorganic fractions, including carbon structure evolution, pore architecture, and surface chemistry, thereby complicating the interpretation of CO₂-sorption-derived textural parameters.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":458,"journal":{"name":"Adsorption","volume":"32 6","pages":""},"PeriodicalIF":3.3,"publicationDate":"2026-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of pressure equalization direction on product purity in Pressure Swing Adsorption (PSA) process","authors":"Saravanakumar Ganesan,&nbsp;Carlos A. Grande","doi":"10.1007/s10450-026-00702-2","DOIUrl":"10.1007/s10450-026-00702-2","url":null,"abstract":"<div><p>Pressure equalization is a critical step in pressure swing adsorption (PSA) cycles, recovering void-space gas between beds to improve product recovery and minimize energy consumption. However, the effect of equalization direction on light product purity has not been systematically examined under controlled experimental conditions. This work presents controlled pilot-scale experiments comparing three equalization configurations: Top-to-Top (T-T), mixed (T-B/T-T), and Top-to-Bottom (T-B), in a 4-column PSA unit for biogas upgrading using a kinetically selective carbon molecular sieve adsorbent. T-T equalization consistently yielded the highest CH₄ purity and recovery, while T-B progressively degraded both metrics simultaneously, contrary to the conventional purity-recovery trade-off. Validated simulation models reveal the governing mechanism: T-B equalization redistributes CO₂ toward the product end during equalization steps, elevating adsorbent loading at the product end and compromising the subsequent adsorption step. Simulations further confirm the same trend for an equilibrium-selective silica gel adsorbent. These results establish T-T equalization as the preferred configuration for PSA cycles targeting high light product purity, and establishing equalization direction as a general and consequential PSA cycle design parameter.</p></div>","PeriodicalId":458,"journal":{"name":"Adsorption","volume":"32 6","pages":""},"PeriodicalIF":3.3,"publicationDate":"2026-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10450-026-00702-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Interplay between CO₂ adsorption strength and molecular mobility in MOF-303: a grand canonical monte carlo and molecular dynamics study","authors":"Subhayu Choudhury,&nbsp;Sakti Pada Shit,&nbsp;Sudipta Pal,&nbsp;Esa Bose","doi":"10.1007/s10450-026-00697-w","DOIUrl":"10.1007/s10450-026-00697-w","url":null,"abstract":"<div><p>The adsorption and movement of Carbon dioxide (CO₂) within the Metal–Organic Framework -303 (MOF-303) were systematically investigated using Grand Canonical Monte Carlo (GCMC) and molecular dynamics (MD) simulations over temperatures ranging from 273 to 333 K and pressures from 0 to 30 bar. The results show that MOF-303 has a strong affinity for CO₂ at low pressures, arising from favorable interactions with aluminium-oxo nodes and nitrogen-containing linkers, while CO₂ uptake at higher pressures is mainly controlled by pore filling. The isosteric heat of adsorption calculated using both fluctuation-based and Clausius-Clapeyron approaches confirms the predominance of physisorptive interactions, thereby indicating favorable reversibility for CO₂ capture applications. Henry coefficient decreases systematically with increasing temperature, further confirming the exothermic process of CO₂ adsorption. Molecular dynamics simulations show that CO₂ diffusion increases with temperature and decreases with pressure, reflecting the competing effects of thermal motion and pore occupancy. Radial distribution function analysis indicates preferential CO₂ adsorption near aluminium-oxo nodes and nitrogen-rich sites at low loadings, with reduced site specificity at elevated temperatures. Overall, these results establish that MOF-303 combines strong CO₂ uptake with adequate molecular mobility, highlighting its potential for CO₂ capture, separation and pressure swing applications.</p></div>","PeriodicalId":458,"journal":{"name":"Adsorption","volume":"32 6","pages":""},"PeriodicalIF":3.3,"publicationDate":"2026-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148465661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"New universal pressure drop correlation for structured adsorbents with parallel channels of any cross-sectional shape","authors":"Ryan T. Sanders,&nbsp;Armin D. Ebner,&nbsp;Charles E. Holland,&nbsp;Marjorie A. Nicholson,&nbsp;James A. Ritter","doi":"10.1007/s10450-026-00698-9","DOIUrl":"10.1007/s10450-026-00698-9","url":null,"abstract":"<div><p>A 1D axial pressure drop correlation was developed for structured adsorbents with parallel channels of any cross-sectional shape simply in terms of its hydraulic diameter. It is based on the Darcy-Weisbach (DW) equation, which includes both laminar and inertial contributions to the pressure drop. It was created from pressure drop data generated from the new, non-experimental methodology developed recently by the authors that uses 3D Navier–Stokes (NS) computational fluid dynamics (CFD). To resolve the 1D-DW correlation, expressed in terms of a Darcy friction factor involving just two fitting parameters, <i>f</i>_<i>1</i> and <i>f</i>_<i>2</i>, an analytic expression derived from the differential 1D-DW model was regressed simultaneously with 300 3D-NS simulations of four different channel cross-sectional shapes (equilateral triangle, isosceles triangle, square, and rectangle) in air at 1 atm and 25 °C. Different hydraulic diameters created 30 different structures of these four shapes with each one evaluated at 10 different velocities. The values of <i>f</i>_<i>1</i> and <i>f</i>_<i>2</i> were determined to be 1.73e-2 and 47.68, respectively. Using the values of <i>f</i>_<i>1</i> and <i>f</i>_<i>2</i>, pressure drop predictions from the differential 1D-DW correlation, solved numerically, were contrasted against those from bench-scale experiments carried out with the triangular channel Catacel and trapezoidal channel Gore structured adsorbents at 0.5, 1 and 3 atm for air, CO₂ and He at 25 °C. The 1D-DW correlation showed very good agreement with experiment for all three outlet pressures and all three gases, and it provided much better predictions compared to two correlations in the literature, i.e., the Shah and London, and Muzychka and Yovanovich correlations. Overall averages of the respective percent average relative errors and the corresponding standard deviations were 4.3 ± 2.3, 14.1 ± 10.8 and 22.9 ± 11.1. These results demonstrated the 1D-DW correlation could be used with confidence in an adsorption process simulator to predict the pressure drop in a structured adsorbent with parallel channels of any cross-sectional shape of known hydraulic diameter.</p></div>","PeriodicalId":458,"journal":{"name":"Adsorption","volume":"32 6","pages":""},"PeriodicalIF":3.3,"publicationDate":"2026-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10450-026-00698-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148465435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of ETS-4 ion exchanged with strontium and the effect of activation temperature on adsorption equilibrium, kinetics and regeneration in CO2 capture from natural gas and post-combustion gas mixtures","authors":"Amirhossein Khademi,&nbsp;Ensieh Ganji Babakhani,&nbsp;Jafar Towfighi Darian,&nbsp;Ramin Ebrahimi,&nbsp;Mahnaz Pourkhalil","doi":"10.1007/s10450-026-00674-3","DOIUrl":"10.1007/s10450-026-00674-3","url":null,"abstract":"<div><p>ETS-4 titanosilicate adsorbent with unique characteristics is very suitable for CO₂ adsorption. However, it is still necessary to study the adsorption performance details and regeneration performance of this adsorbent as well as its ion-exchange type Sr-ETS-4 and the effect of the activation temperature for CO₂/CH₄ separation and post-combustion CO₂ capture (CO₂/N₂ separation). In the present work, CO₂, CH₄, and N₂ adsorption equilibria for the synthesized ETS-4 and Sr-exchanged ETS-4 were measured at 25 °C. Adsorption data were used for modeling to predict the phase diagram, selectivity, and total adsorption of samples in binary mixtures with the IAST method. Also, the CO₂ adsorption kinetics data were measured and investigated by micropore diffusion and Pseudo-n^th-Order (PNO) models. The results showed that ion exchange with strontium enhanced significantly the thermal stability of ETS-4. Also, although the CO₂ adsorption capacity on SrETS-4-110 decreased by less than 35% compared to ETS-4 at the same activation temperature(110 °C), CO₂/CH₄ and CO₂/N₂ selectivities increased up to 1951 and 1088 which was an increase of 46% and 150%, respectively while the kinetic rate constant of the PNO model (k_n) increased from 30.7 to 33.5. In addition, by increasing activation temperature to 210 °C for Sr-exchanged samples (SrETS-4-210), the lowest selectivity value was achieved for CO₂/CH₄ (267) and CO₂/N₂ (229). Furthermore, the regeneration performance of ETS-4 and the Sr-exchanged ETS-4 after CO₂ adsorption was investigated for the first time using different regeneration methods including pressure reduction, applying vacuum, and heating. It was observed that the regeneration efficiency of SrETS-4-110 increased from 68 to 85% in comparison to ETS-4 by applying vacuum, but for SrETS-4-210, this value decreased to 72%. In conclusion, SrETS-4-110 with an enhanced thermal stability and good adsorption properties, the highest selectivity as well as the highest regeneration efficiency can be suggested to use in PSA-based CO₂ separation.</p></div>","PeriodicalId":458,"journal":{"name":"Adsorption","volume":"32 6","pages":""},"PeriodicalIF":3.3,"publicationDate":"2026-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148380367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}