Journal of CO2 Utilization最新文献

{"title":"CO2 capture and zeolite synthesis via hydrothermal treatment of inertized rock wool","authors":"Giulio Galamini ,&nbsp;Daniele Malferrari ,&nbsp;Alessandro Francesco Gualtieri","doi":"10.1016/j.jcou.2026.103434","DOIUrl":"10.1016/j.jcou.2026.103434","url":null,"abstract":"<div><div>The management of rock wool waste poses a growing challenge, with global production exceeding 2.5 million tons annually. Thermal inertization converts this fibrous hazardous waste into safe glassy products; however, high-value applications of the inerted product remain limited. This study is a preliminary investigation into a sustainable valorization pathway for thermally inertized mineral wool, focusing on CO₂ recovery during low-temperature (130 °C) alkaline hydrothermal synthesis. A comparative assessment was performed between synthesis in a CO₂-enriched atmosphere and ambient air. Results revealed CO₂ as a key parameter controlling crystallization pathways and zeolite yield, along with CO₂ fixation through carbonation. Synthesis in air predominantly yielded 11-Å tobermorite and transient carbonates (vaterite), with limited zeolite (analcime) formation. Conversely, the CO₂-enriched atmosphere suppressed tobermorite, favoring Na-P and phillipsite zeolites alongside stable calcite. The CO₂-based process proved superior across all key metrics. Zeolitic yields were nearly fourfold higher, resulting in a cation exchange capacity of 40.7 ± 1.6 compared to 12.3 ± 0.9 cmol(+)/kg in air. Furthermore, CO₂-synthesis demonstrated an 86% increase in carbon capture efficiency (4.49 wt% vs. 2.41 wt%), driven by stable mineral carbonation. Overall, the proposed hydrothermal pathway provides a promising laboratory-scale strategy for <em>End-of-Waste</em> upcycling while enabling CO₂ sequestration, demonstrating that a CO₂-rich environment enhances zeolite crystallization and increases CO₂ retention.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"107 ","pages":"Article 103434"},"PeriodicalIF":8.4,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147803337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reverse water gas shift in microwave plasma for O2 removal and CO2 conversion enhancement","authors":"A. Hecimovic ,&nbsp;R. Antunes ,&nbsp;C. Kranig ,&nbsp;A. Meindl ,&nbsp;U. Fantz","doi":"10.1016/j.jcou.2026.103403","DOIUrl":"10.1016/j.jcou.2026.103403","url":null,"abstract":"<div><div>One of the major challenges of using plasmas for CO₂ conversion is the removal of oxygen in the plasma effluent. In this work an efficient removal of oxygen (<span><math><mrow><mo>&gt;</mo><mn>99</mn></mrow></math></span>% removal) from the product gas stream in a 2.45 GHz microwave plasma reactor at atmospheric pressure is reported. This is achieved by addition of H₂ gas enabling the reverse water gas shift reaction. The addition of H₂ takes place either immediately after the microwave resonator, or inside the resonator, affecting the plasma size and optical emission in the latter case. The performance is comparable for both positions of H₂ addition. Already 2 vol.% of H₂ admixture results in O₂ removal below 0.1 vol.% from the product gas stream, however at the cost of lower CO₂ conversion. An increase of H₂ flow leads to a rise of the CO₂ conversion in accordance to the thermodynamics of the reverse water gas shift reaction. CO₂ conversions of up to 65%, and CO energy yields of up to 0.27 kg<span><math><msub><mrow></mrow><mrow><mi>CO</mi></mrow></msub></math></span>kWh⁻¹ are achieved with less than 0.1 vol.% O₂ in the product gas. The [H₂]/[CO] ratio in the product gas lies in the range between 1.8–2.2 which makes it suitable for synthetic fuel processes such as Fischer–Tropsch. The performance comparison demonstrates that the presented method of O₂ removal by H₂ admixing to the microwave CO₂ plasma is a very efficient process compared to other O₂ removal methods yielding the highest energy yields.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"106 ","pages":"Article 103403"},"PeriodicalIF":8.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147600088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Temporary CO₂ storage: Influence of structural and engineering factors on subsurface performance","authors":"Farah Ali,&nbsp;Eric Mackay","doi":"10.1016/j.jcou.2026.103396","DOIUrl":"10.1016/j.jcou.2026.103396","url":null,"abstract":"<div><div>Temporary subsurface CO₂ storage represents a novel and transformative concept in carbon management, complementing traditional permanent sequestration by enabling controlled recovery and redeployment of injected CO₂. Unlike conventional storage, which prioritizes long-term isolation, temporary storage formalizes dynamic injection–production strategies that may be used to avoid emissions to the atmosphere in the short term, instead temporarily storing the CO₂ for subsequent use for CO₂-EOR, CO₂-EGR, and CO₂-Plume Geothermal systems, thereby enhancing operational flexibility and supporting circular carbon use. Building on operational insights from these established technologies, this study investigates how geological structure geometry governs the efficiency and suitability of temporary versus permanent storage. A series of 2D compositional reservoir simulations in CMG-GEM, conducted under uniform petrophysical and operational conditions, tested flat reservoirs, low-angle closures, and dipping structures. Results show that flat and low-angle closures achieve recovery factors of ∼80–84%, with predictable plume migration and effective containment, making them optimal for temporary storage. By contrast, dipping structures (2°–10°) promote gravitational trapping but reduce recoverability, with recovery declining to ∼19% at higher dip angles, aligning them with permanent storage objectives. The analysis further highlights how well placement, production capacity, and operational constraints such as water handling and bottom-hole pressure critically interact with structural geometry to shape storage performance. Well placement along the dip direction is a dominant control: top-of-structure positioning achieves 85–86% recovery across all dip angles, effectively neutralising the adverse impact of structural dip. Immediate production following injection cessation consistently outperforms delayed production, with a 10-year shut-in reducing recovery due to progressive residual and solubility trapping. Furthermore, lower production rates sustain extended CO₂ production plateaus suited to steady capture streams, whereas higher production rates maximise short-term deliverability but lead to earlier termination due to water-handling constraints. These findings confirm that geological structure, well placement, and production timing are first-order control on storage outcomes and that deliberate matching of geometry with storage strategy can maximize the value of CCS projects by integrating both temporary and permanent roles. Ultimately, temporary storage should be regarded as a strategic enabler of large-scale decarbonisation, bridging gaps in permanent capacity and supporting circular carbon use across the CCS value chain.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"106 ","pages":"Article 103396"},"PeriodicalIF":8.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147600008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A promising MEA solvent regeneration approach using MXene@MOF catalyst for energy efficient CO2 capture","authors":"Muhammad Waseem,&nbsp;Nayef Ghasem,&nbsp;Mohamed Al-Marzouqi","doi":"10.1016/j.jcou.2026.103410","DOIUrl":"10.1016/j.jcou.2026.103410","url":null,"abstract":"<div><div>Aqueous amine-based systems remain the most viable option for industrial carbon dioxide (CO₂) removal from flue gases, but their widespread application is hindered by the high energy demands of solvent regeneration. The MXene@MOF nanocomposite addresses this limitation through catalytic regeneration by introducing a high density of active sites both Lewis acid sites (LASs) and Brønsted acid sites (BASs) on the catalyst surface that work cooperatively to enhance catalytic efficiency. By merging the conductive, surface-rich characteristics of molybdenum based MXene (Mo₂CTₓ) with the versatile coordination chemistry of zeolitic imidazolate frameworks based MOF (ZIF67), the composite delivers accelerated CO₂ desorption. MXene@MOF accelerates CO₂ desorption by leveraging synergistic LASs and BASs that weaken carbamate bonds and facilitate efficient proton transfer, enabling faster CO₂ release at lower energy input. It achieved a 159% improvement in rate of CO₂ desorption and a 50% rise in desorbed CO₂ amount as compared to a process without catalyst, while also reducing regeneration energy consumption by 30%. The distinctly formed active sites on catalyst surface promote carbamate decomposition and proton transfer, making this hybrid material a promising advancement in CO₂ capture for amine regeneration, and proposing it as a potential candidate among next-generation separation technologies for mitigating both industrial and naturally occurring CO₂ emissions.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"106 ","pages":"Article 103410"},"PeriodicalIF":8.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147600009","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Corrigendum to “CO2 utilization and sequestration potential in deep coal seams: A case study on Carboniferous coals from the Karaganda Basin, Kazakhstan” [J. CO2 Util. 101 (2025) 103204]","authors":"Majid Safaei-Farouji ,&nbsp;David Misch ,&nbsp;Reinhard F. Sachsenhofer ,&nbsp;Nikolaos Kostoglou ,&nbsp;Garri Gaus ,&nbsp;Thorsten Bauersachs ,&nbsp;Medet Junussov ,&nbsp;Milovan Fustic","doi":"10.1016/j.jcou.2026.103370","DOIUrl":"10.1016/j.jcou.2026.103370","url":null,"abstract":"","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"106 ","pages":"Article 103370"},"PeriodicalIF":8.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147649946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recent advances in integrated CO2 capture and electrochemical conversion to value-added chemicals and fuels","authors":"Woo Jin Jeon,&nbsp;Mi Gyoung Lee","doi":"10.1016/j.jcou.2026.103405","DOIUrl":"10.1016/j.jcou.2026.103405","url":null,"abstract":"<div><div>Carbon dioxide (CO₂) capture and conversion technologies have emerged as promising approaches to mitigate rising atmospheric CO₂ levels while simultaneously enabling to production of value-added chemicals and fuels. In particular, integrated CO₂ capture and utilization (ICCU) has gained attention due to its ability to eliminate energy-intensive steps including the capture media regeneration and compression, thereby offering the improved energy efficiency over conventional independent CCU systems. This review begins by tracing the historical development of CCU and provides a comparative assessment of independent versus integrated CCU systems, with a particular focus on energy requirements and production costs. To elucidate the technological progress of ICCU, we discuss state-of-the-art studies based on four different CO₂ capture media. Finally, the critical perspectives on the current challenges and future directions in this field, emphasizing the need to achieve high CO₂ conversion efficiency, enhanced Faradaic efficiency, and reduced cell voltage for scalable industrial applications, are offered.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"106 ","pages":"Article 103405"},"PeriodicalIF":8.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147600046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Integrated design and optimization for a unified carbon capture and storage system using a machine-learning-assisted multi-objective optimization framework","authors":"Suin Choi ,&nbsp;Minkyung Chae ,&nbsp;Soeun Yoon ,&nbsp;Tea-Woo Kim ,&nbsp;Suryeom Jo ,&nbsp;Byungin Ian Choi ,&nbsp;Honggeun Jo ,&nbsp;Baehyun Min","doi":"10.1016/j.jcou.2026.103402","DOIUrl":"10.1016/j.jcou.2026.103402","url":null,"abstract":"<div><div>Efficient deployment of carbon capture and storage (CCS) systems requires the integrated design of surface facilities and subsurface storage reservoirs. Herein, we propose a unified CCS system design framework in which dynamic nodal analysis, multi-objective optimization, and machine-learning are combined to support efficient and scalable decision-making. Optimization is focused on four key design variables: the CO₂ discharge pressure at the hub terminal, the inner diameters of the pipeline and injection tubing, and the injection temperature, with storage capacity, injection safety, and economic feasibility as the performance objectives. Dynamic nodal analysis couples surface and subsurface flow physics—specifically, compressible pipe flow dynamics for surface transport and Darcy-based porous media flow for subsurface storage—to simulate transient system behavior. A multi-objective particle swarm optimization algorithm linked to a full-physics facility-reservoir model was used to derive an initial Pareto-optimal front covering approximately 3.8% of the feasible design space. This was refined and expanded by using machine-learning-based proxies, including neural network, random forest, and boosting techniques trained on the optimization results. The framework was applied to a potential CCS assessment project in the Republic of Korea, an onshore CO₂ terminal, a 175-km subsea pipeline, and a 1-km vertical injection well. The machine-learning models demonstrated high predictive performance (<span><math><msup><mrow><mi>R</mi></mrow><mrow><mn>2</mn></mrow></msup></math></span> &gt; 0.96; Mean Absolute Percent Error ≦ 5%) and significantly reduced computational time compared to a full-physics simulation. This hybrid framework offers a practical and accurate approach for early-stage CCS system design and lays the foundation for real-world deployment under complex multi-objective constraints.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"106 ","pages":"Article 103402"},"PeriodicalIF":8.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147600087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Perovskite design principles for efficient microwave dry reforming with noble metal free catalysts","authors":"Chris M. Marin ,&nbsp;Eric J. Popczun ,&nbsp;Christina N. Wildfire ,&nbsp;Orhan Kizilkaya ,&nbsp;Douglas R. Kauffman","doi":"10.1016/j.jcou.2026.103337","DOIUrl":"10.1016/j.jcou.2026.103337","url":null,"abstract":"<div><div>Microwave absorbing catalysts have the potential to electrify high-temperature thermal reactions such as the dry reforming of methane process (DRM: CO₂ + CH₄ → 2CO + 2 H₂). However, microwave catalysts present unique challenges due to their dual requirements of maintaining microwave absorption in both oxidative and reductive environments and stability across a range of temperatures in inherently non-isothermal reactors. Here, catalyst candidates from the La_0.8Sr_0.2CoO₃-La_0.8Sr_0.2NiO₃-La_0.8Sr_0.2MnO₃ perovskite systems were screened (28 total) to identify promising microwave catalysts free of noble metals for dry reforming methane. The best performing candidates met two main criteria. First, they occurred at crystal phase boundaries, giving rise to a pseudocubic perovskite structure. The combined use of Goldschmidt tolerance factor and octahedral tolerance factors appeared to be suitable for predicting pseudocubic perovskites. Second, they provided a balance of reducible metal sites with an irreducible metal oxide support. The best performing catalyst was found to exsolve Ni-Co alloy particles as active sites for the DRM reaction which offered superior resistance to coking for excellent reforming efficiency and stability.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"106 ","pages":"Article 103337"},"PeriodicalIF":8.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147600011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the kinetic characteristics of CO2 hydrate formation in a pure water system","authors":"Yuanpeng Cheng ,&nbsp;Hucheng Bai ,&nbsp;Xuewen Cao ,&nbsp;Hongchao Wang ,&nbsp;Jiang Bian","doi":"10.1016/j.jcou.2026.103408","DOIUrl":"10.1016/j.jcou.2026.103408","url":null,"abstract":"<div><div>Hydrate-based carbon dioxide sequestration presents a promising strategy for mitigating anthropogenic greenhouse gas emissions. Understanding the formation dynamics of CO₂ hydrates in aqueous systems is critical for optimizing hydrate-based storage technology. This study demonstrates the interfacial nucleation and staged growth mechanisms of CO₂ hydrates in pure water under isobaric conditions (3 MPa, 6 °C). The mechanisms are elucidated using real-time kinetic and thermodynamic analyses. Experimental results reveal that hydrate formation initiates preferentially at the gas–liquid interface and subsequently evolves into porous honeycomb-structured aggregates through three sequential phases: dissolution-dominated gas-liquid mass transfer, a metastable induction/nucleation stage with an extended induction time of 214 min, and rapid hydrate growth at 0.025 mol·min⁻¹. The process achieves a CO₂-to-hydrate conversion efficiency of 67.3%, storing 10.61 L of CO₂ per liter of water with a hydrate volume fraction of 6.12%. These findings highlight the critical role of interfacial dynamics in hydrate crystallization and establish the technical viability of moderate subcooling strategies for energy-efficient carbon sequestration, providing fundamental insights for optimizing hydrate-based carbon capture and storage technologies.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"106 ","pages":"Article 103408"},"PeriodicalIF":8.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147600010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Machine learning-driven design of high-performance activated carbons for enhanced CO2 capture","authors":"Ashkan Maleki ,&nbsp;Arash Mehdizad ,&nbsp;Esmaeil Hassani ,&nbsp;Mohammad Naveshki ,&nbsp;Ali Zalakinezhad ,&nbsp;Alimorad Rashidi ,&nbsp;Abdolreza Farhadian ,&nbsp;Dariush Hassanvand Somarin ,&nbsp;Fariba Aghazadeh","doi":"10.1016/j.jcou.2026.103336","DOIUrl":"10.1016/j.jcou.2026.103336","url":null,"abstract":"<div><div>Rising atmospheric CO₂ levels demand efficient carbon capture technologies. Activated carbons (ACs), known for their high surface area and adjustable porosity, offer a promising pathway for CO₂ adsorption. However, optimizing their structural and chemical properties often requires time-intensive experimental trials. This study addresses this challenge by leveraging machine learning (ML) to predict CO₂ adsorption capacity and guide the design of high-performance ACs. A comprehensive dataset, including pore volume, mean pore diameter, adsorption temperature and pressure, and BET surface area, was utilized to train four ML models using K-Fold approach with five folds, with CO₂ uptake as the target parameter. Among the tested models, Gradient Boosting achieved the best performance (R² = 0.9989) with high predictive precision. Experimental validation using asphaltene-derived AC confirmed excellent agreement between predicted and measured CO₂ uptake values. Adsorption experiments at 1 bar and 298 K measured CO₂ uptake at 4.72 mmol/g, closely aligning with the Gradient Boosting model's predicted value of 4.81 mmol/g. The study highlights the model’s capability to simulate CO₂-AC interactions and its potential to reduce the need for extensive experimental trials. 3D plots generated by the Gradient Boosting model provided valuable insights into optimizing textural and adsorption properties to maximize CO₂ uptake. This integrated approach accelerates the discovery and design of high-performance adsorbents, offering a roadmap for sustainable carbon capture solutions.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"105 ","pages":"Article 103336"},"PeriodicalIF":8.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146170660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}