Pub Date : 2025-12-03DOI: 10.1016/j.jcou.2025.103288
Sophia Villmow , Anika Mielkau , Maciej Zajac , Jürgen Neubauer
In this study, the carbonation behavior of Ca-Mg/Al silicates was investigated in a specially designed wet reactor. The Mg/Al-rich phases studied represent a diverse group of materials, whose carbonation kinetics depend on their chemical composition and crystal structure. The reactions of synthetic akermanite (C2MS2), bredigite (C7MS4), merwinite (C3MS2), and gehlenite (C2AS) were monitored through continuous pH and temperature measurements, while data on the CO2 uptake, the dissolution and precipitation of hydrates, and carbonation products were measured by quantitative X-ray diffraction (QXRD) and thermogravimetric analysis (TGA). Under the given conditions, the Ca-Mg silicates exhibited a degree of reaction above 80 % within just three hours. In contrast, the Ca-Al silicate gehlenite showed little to no carbonation potential. Characteristic carbonation and hydration products include CaCO₃ (ACc, calcite, aragonite), (Ca,Mg)CO₃, and amorphous SiO2 gels.
{"title":"Wet carbonation potential of Mg- and Al-bearing calcium silicate clinker phases","authors":"Sophia Villmow , Anika Mielkau , Maciej Zajac , Jürgen Neubauer","doi":"10.1016/j.jcou.2025.103288","DOIUrl":"10.1016/j.jcou.2025.103288","url":null,"abstract":"<div><div>In this study, the carbonation behavior of Ca-Mg/Al silicates was investigated in a specially designed wet reactor. The Mg/Al-rich phases studied represent a diverse group of materials, whose carbonation kinetics depend on their chemical composition and crystal structure. The reactions of synthetic akermanite (C<sub>2</sub>MS<sub>2</sub>), bredigite (C<sub>7</sub>MS<sub>4</sub>), merwinite (C<sub>3</sub>MS<sub>2</sub>), and gehlenite (C<sub>2</sub>AS) were monitored through continuous pH and temperature measurements, while data on the CO<sub>2</sub> uptake, the dissolution and precipitation of hydrates, and carbonation products were measured by quantitative X-ray diffraction (QXRD) and thermogravimetric analysis (TGA). Under the given conditions, the Ca-Mg silicates exhibited a degree of reaction above 80 % within just three hours. In contrast, the Ca-Al silicate gehlenite showed little to no carbonation potential. Characteristic carbonation and hydration products include CaCO₃ (ACc, calcite, aragonite), (Ca,Mg)CO₃, and amorphous SiO<sub>2</sub> gels.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"103 ","pages":"Article 103288"},"PeriodicalIF":8.4,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145693455","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}
Pub Date : 2025-12-02DOI: 10.1016/j.jcou.2025.103277
Jiaqi Wang, Jiaxing Liu, Kai Zhang, Si Li, Kun Ge
Carbon Capture and Storage (CCS) is a critical technology for addressing climate changes, and CO₂ hydrate storage has gained attention due to its high-density potential and stability. This study investigates the phase behavior of CO₂ hydrates in saline conditions through experiments and thermodynamic analysis, providing a theoretical foundation and data support for optimizing sequestration strategies. The results show that in saline solutions, induction time decreases with increasing salt concentration. The maximum gas storage capacity (79.5 mmol/mol) occurs at 0.3 wt% NaCl, but the decomposition stability is weakest. In different salt solutions, the gas storage capacity in Na⁺ systems is 1.82 times higher than in K⁺ systems, while K⁺ systems have stronger decomposition stability (2.56 times longer decomposition time). SO₄²⁻ systems outperform Cl⁻ systems in formation rate and stability. In addition, the hydrate phase equilibrium conditions are significantly influenced by salt concentration, with a maximum temperature shift of 1.0 K, but differences between salt types at the same concentration are negligible. Finally, an improved model incorporating the mechanisms of each system’s influence on hydrate phase behavior is developed to predict phase equilibrium conditions in submarine sediment environments, which achieves less than 0.25 K deviation with high accuracy. This study provides essential data and theoretical support for the engineering application of CO₂ hydrate sequestration technology.
{"title":"Research on the phase behavior and thermodynamic analysis of CO₂ hydrate in saline systems","authors":"Jiaqi Wang, Jiaxing Liu, Kai Zhang, Si Li, Kun Ge","doi":"10.1016/j.jcou.2025.103277","DOIUrl":"10.1016/j.jcou.2025.103277","url":null,"abstract":"<div><div>Carbon Capture and Storage (CCS) is a critical technology for addressing climate changes, and CO₂ hydrate storage has gained attention due to its high-density potential and stability. This study investigates the phase behavior of CO₂ hydrates in saline conditions through experiments and thermodynamic analysis, providing a theoretical foundation and data support for optimizing sequestration strategies. The results show that in saline solutions, induction time decreases with increasing salt concentration. The maximum gas storage capacity (79.5 mmol/mol) occurs at 0.3 wt% NaCl, but the decomposition stability is weakest. In different salt solutions, the gas storage capacity in Na⁺ systems is 1.82 times higher than in K⁺ systems, while K⁺ systems have stronger decomposition stability (2.56 times longer decomposition time). SO₄²⁻ systems outperform Cl⁻ systems in formation rate and stability. In addition, the hydrate phase equilibrium conditions are significantly influenced by salt concentration, with a maximum temperature shift of 1.0 K, but differences between salt types at the same concentration are negligible. Finally, an improved model incorporating the mechanisms of each system’s influence on hydrate phase behavior is developed to predict phase equilibrium conditions in submarine sediment environments, which achieves less than 0.25 K deviation with high accuracy. This study provides essential data and theoretical support for the engineering application of CO₂ hydrate sequestration technology.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"103 ","pages":"Article 103277"},"PeriodicalIF":8.4,"publicationDate":"2025-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145651999","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}
Pub Date : 2025-12-01DOI: 10.1016/j.jcou.2025.103286
CORVEC Gaël , ARTONI Riccardo , TURCRY Philippe , AIT-MOKHTAR Abdelkarim , RICHARD Patrick , CAZACLIU Bogdan
Accelerated carbonation of recycled concrete aggregates (RCA) in industrial CO2-rich environments is a promising technique to enhance CO2 sequestration while improving RCA properties. This study investigates the influence of temperature (50–110 °C), initial water saturation degree (0.34–0.93), and RCA particle size (0–4 mm) on carbonation efficiency in a fixed-bed reactor under controlled conditions, simulating cement plant flue gases. Results highlight that water saturation degree is a key parameter, as it influences both CO2 transport in the pore system and the dissolution of reactive phases. Temperature significantly impacts water saturation degree evolution, which in turn affects reaction kinetics. For each initial water saturation degree, an optimal temperature maximizes carbonation, reaching degrees above 40 % after only 2 h carbonation. Particle size also influences carbonation efficiency: finer RCA exhibit higher carbonation rates. A novel Macro-TGA methodology was employed to quantify carbonate formation in 500 g samples, offering a more representative assessment compared to classical thermogravimetric analyses. Finally, water absorption tests before and after carbonation showed a slight reduction, with a maximum decrease of 2.7 % at 80 °C and 0.93 initial water saturation degree. However, no direct correlation between water absorption and carbonation degree was observed, suggesting complex porosity evolution that requires further investigation.
{"title":"Carbonation of recycled concrete aggregate in a fixed-bed reactor: Effects of temperature, initial water saturation degree and particle size","authors":"CORVEC Gaël , ARTONI Riccardo , TURCRY Philippe , AIT-MOKHTAR Abdelkarim , RICHARD Patrick , CAZACLIU Bogdan","doi":"10.1016/j.jcou.2025.103286","DOIUrl":"10.1016/j.jcou.2025.103286","url":null,"abstract":"<div><div>Accelerated carbonation of recycled concrete aggregates (RCA) in industrial CO<sub>2</sub>-rich environments is a promising technique to enhance CO<sub>2</sub> sequestration while improving RCA properties. This study investigates the influence of temperature (50–110 °C), initial water saturation degree (0.34–0.93), and RCA particle size (0–4 mm) on carbonation efficiency in a fixed-bed reactor under controlled conditions, simulating cement plant flue gases. Results highlight that water saturation degree is a key parameter, as it influences both CO<sub>2</sub> transport in the pore system and the dissolution of reactive phases. Temperature significantly impacts water saturation degree evolution, which in turn affects reaction kinetics. For each initial water saturation degree, an optimal temperature maximizes carbonation, reaching degrees above 40 % after only 2 h carbonation. Particle size also influences carbonation efficiency: finer RCA exhibit higher carbonation rates. A novel Macro-TGA methodology was employed to quantify carbonate formation in 500 g samples, offering a more representative assessment compared to classical thermogravimetric analyses. Finally, water absorption tests before and after carbonation showed a slight reduction, with a maximum decrease of 2.7 % at 80 °C and 0.93 initial water saturation degree. However, no direct correlation between water absorption and carbonation degree was observed, suggesting complex porosity evolution that requires further investigation.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"102 ","pages":"Article 103286"},"PeriodicalIF":8.4,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145614769","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}
Pub Date : 2025-12-01DOI: 10.1016/j.jcou.2025.103279
Mohadeseh Rashvand , Mojtaba Khorasani
A nitrogen-rich covalent triazine framework (CTF) with a low carbon-to-nitrogen (C/N) molar ratio of 1.46 was synthesized as a solid nitrogen-containing ligand, offering abundant coordination sites for the immobilization of nickel(II) acetate catalyst for CO2 utilization. The resulting heterogeneous Ni-CTF catalyst was thoroughly characterized by porosimetry, TGA, FTIR, Raman spectroscopy, SEM-EDAX, XPS, XRD, and CO₂ adsorption capacity analyses. Ni-CTF efficiently promoted the direct coupling of carbon dioxide with epoxides under relatively mild conditions (0.25 mol% Ni-CTF, 0.5 mol% TBAB, 7.5 bar CO₂, 100 °C). To clarify the individual roles of each catalytic component, a series of control experiments were conducted under identical conditions, including Ni-CTF alone, the pristine CTF, unsupported nickel(II) acetate, and various co-catalysts with distinct chemical properties. These systematic investigations provided deeper insight into the contributions to catalytic performance. Ni-CTF displayed excellent recyclability, retaining both activity and selectivity over at least four consecutive cycles without noticeable loss in performance. The observed catalytic performance is attributed to the organic nature of the CTF, which facilitates the diffusion of organic epoxide molecules, as well as to the nitrogen-rich functionalities embedded within the triazine network. These nitrogen sites, in conjunction with their ability to coordinate nickel species, significantly enhance the CO2 adsorption capacity of the catalyst.
合成了一种低碳氮（C/N）摩尔比为1.46的富氮共价三嗪框架（CTF）作为固体含氮配体，为固定化乙酸镍催化剂提供了丰富的配位位点。通过孔隙率测定、热重分析、红外光谱、拉曼光谱、SEM-EDAX、XPS、XRD和CO₂吸附量分析对制备的Ni-CTF催化剂进行了全面表征。在相对温和的条件下（0.25 mol% Ni-CTF, 0.5 mol% TBAB, 7.5 bar CO₂，100℃），Ni-CTF能有效促进二氧化碳与环氧化物的直接偶联。为了明确每种催化成分的单独作用，在相同的条件下进行了一系列对照实验，包括单独的Ni-CTF，原始CTF，不负载的醋酸镍（II）和各种具有不同化学性质的助催化剂。这些系统的研究对催化性能的贡献提供了更深入的了解。Ni-CTF表现出优异的可回收性，在至少四个连续循环中保持活性和选择性，而性能没有明显损失。观察到的催化性能归因于CTF的有机性质，它促进了有机环氧化物分子的扩散，以及嵌入在三嗪网络中的富氮功能。这些氮位点，连同它们协调镍种的能力，显著提高了催化剂的CO2吸附能力。
{"title":"Nitrogen-rich covalent triazine frameworks as efficient supports for nickel-catalyzed CO2 conversion","authors":"Mohadeseh Rashvand , Mojtaba Khorasani","doi":"10.1016/j.jcou.2025.103279","DOIUrl":"10.1016/j.jcou.2025.103279","url":null,"abstract":"<div><div>A nitrogen-rich covalent triazine framework (CTF) with a low carbon-to-nitrogen (C/N) molar ratio of 1.46 was synthesized as a solid nitrogen-containing ligand, offering abundant coordination sites for the immobilization of nickel(II) acetate catalyst for CO<sub>2</sub> utilization. The resulting heterogeneous Ni-CTF catalyst was thoroughly characterized by porosimetry, TGA, FTIR, Raman spectroscopy, SEM-EDAX, XPS, XRD, and CO₂ adsorption capacity analyses. Ni-CTF efficiently promoted the direct coupling of carbon dioxide with epoxides under relatively mild conditions (0.25 mol% Ni-CTF, 0.5 mol% TBAB, 7.5 bar CO₂, 100 °C). To clarify the individual roles of each catalytic component, a series of control experiments were conducted under identical conditions, including Ni-CTF alone, the pristine CTF, unsupported nickel(II) acetate, and various co-catalysts with distinct chemical properties. These systematic investigations provided deeper insight into the contributions to catalytic performance. Ni-CTF displayed excellent recyclability, retaining both activity and selectivity over at least four consecutive cycles without noticeable loss in performance. The observed catalytic performance is attributed to the organic nature of the CTF, which facilitates the diffusion of organic epoxide molecules, as well as to the nitrogen-rich functionalities embedded within the triazine network. These nitrogen sites, in conjunction with their ability to coordinate nickel species, significantly enhance the CO<sub>2</sub> adsorption capacity of the catalyst.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"102 ","pages":"Article 103279"},"PeriodicalIF":8.4,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145614768","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}
Pub Date : 2025-12-01DOI: 10.1016/j.jcou.2025.103285
Amir Hossein Sheikhshoaei, Ali Sanati
Accurate prediction of CO₂ solubility in deep eutectic solvents (DESs) is crucial for advancing carbon capture technologies. This study presents a robust machine learning (ML) framework using key physicochemical properties, including temperature (T), pressure (P), critical temperature (Tc), critical pressure (Pc), critical volume (Vc), acentric factor (ω), and molecular weight (MW), to model CO₂ solubility across 2327 experimental data points derived from 94 unique DESs. Four algorithms, Categorical Boosting (CatBoost), Light Gradient Boosting Machine (LightGBM), Gradient Boosting (GBoost), and Gaussian Process Regression (GPR), were trained and evaluated for this purpose, with CatBoost outperforming other models (R² = 0.998; MAE = 0.021). According to SHAP analysis, pressure and temperature emerged as the most influential parameters, whereas molecular descriptors offered fine-grained adjustments that enriched the predictive performance. The CatBoost model showed high generalizability across diverse conditions and DES combinations, with 94.37 % of predictions falling within the model's valid range. This data-driven approach provides a computationally efficient and interpretable tool for the rapid screening and rational design of high-performance DESs, accelerating the development of advanced carbon capture technologies.
{"title":"Data-driven insights into CO₂ solubility in deep eutectic solvents","authors":"Amir Hossein Sheikhshoaei, Ali Sanati","doi":"10.1016/j.jcou.2025.103285","DOIUrl":"10.1016/j.jcou.2025.103285","url":null,"abstract":"<div><div>Accurate prediction of CO₂ solubility in deep eutectic solvents (DESs) is crucial for advancing carbon capture technologies. This study presents a robust machine learning (ML) framework using key physicochemical properties, including temperature (T), pressure (P), critical temperature (Tc), critical pressure (Pc), critical volume (Vc), acentric factor (ω), and molecular weight (MW), to model CO₂ solubility across 2327 experimental data points derived from 94 unique DESs. Four algorithms, Categorical Boosting (CatBoost), Light Gradient Boosting Machine (LightGBM), Gradient Boosting (GBoost), and Gaussian Process Regression (GPR), were trained and evaluated for this purpose, with CatBoost outperforming other models (R² = 0.998; MAE = 0.021). According to SHAP analysis, pressure and temperature emerged as the most influential parameters, whereas molecular descriptors offered fine-grained adjustments that enriched the predictive performance. The CatBoost model showed high generalizability across diverse conditions and DES combinations, with 94.37 % of predictions falling within the model's valid range. This data-driven approach provides a computationally efficient and interpretable tool for the rapid screening and rational design of high-performance DESs, accelerating the development of advanced carbon capture technologies.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"102 ","pages":"Article 103285"},"PeriodicalIF":8.4,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145614771","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}
Pub Date : 2025-12-01DOI: 10.1016/j.jcou.2025.103282
Badri Daryanavard Roudsari , Saeed Hasannia , Mohammad Kazemeini
Selective photoreduction of CO2 to a single product remains a major challenge in solar fuels catalysis. Herein, we report a hollow covalent organic framework hosting isolated Cu sites (Cu-HCOF) which drives the CO2-to-CO reaction through the visible-light with high activity and selectivity. The ordered framework directs interfacial electron transfer from an external photosensitizer to the single Cu centers, accelerating CO formation while suppressing H2 evolution. Robust chemical anchoring of single Cu sites within the framework secures atomic dispersion of the active centers and simultaneously enhances CO2 uptake and diffusion. Under visible-light irradiation, Cu-HCOF achieves a CO yield of 2881 μmol/g within 3 h (≈960 μmol/g.h), exhibiting 91 % selectivity over H2. Notably, the CO production rate of Cu-HCOF is enhanced by factors of 52.5 and 1.5 relative to pure COF and shapeless COF-Cu; respectively. We attribute this performance to the coupled effects of the hollow architecture, enhancing light harvesting via multiple internal reflections and shortening mass-transport pathways as well as; the locally tailored electronic environment of the Cu sites, which facilitates charge separation and CO2 activation. These results establish morphology-controlled COFs with atomically dispersed metals as an effective platform for tuning active-site electronics and advancing selective CO2 reduction into CO.
{"title":"Selective photocatalytic reduction of CO2 to CO mediated by atomically dispersed Cu-anchored upon hollow covalent organic frameworks","authors":"Badri Daryanavard Roudsari , Saeed Hasannia , Mohammad Kazemeini","doi":"10.1016/j.jcou.2025.103282","DOIUrl":"10.1016/j.jcou.2025.103282","url":null,"abstract":"<div><div>Selective photoreduction of CO<sub>2</sub> to a single product remains a major challenge in solar fuels catalysis. Herein, we report a hollow covalent organic framework hosting isolated Cu sites (Cu-HCOF) which drives the CO<sub>2</sub>-to-CO reaction through the visible-light with high activity and selectivity. The ordered framework directs interfacial electron transfer from an external photosensitizer to the single Cu centers, accelerating CO formation while suppressing H<sub>2</sub> evolution. Robust chemical anchoring of single Cu sites within the framework secures atomic dispersion of the active centers and simultaneously enhances CO<sub>2</sub> uptake and diffusion. Under visible-light irradiation, Cu-HCOF achieves a CO yield of 2881 μmol/g within 3 h (≈960 μmol/g.h), exhibiting 91 % selectivity over H<sub>2</sub>. Notably, the CO production rate of Cu-HCOF is enhanced by factors of 52.5 and 1.5 relative to pure COF and shapeless COF-Cu; respectively. We attribute this performance to the coupled effects of the hollow architecture, enhancing light harvesting via multiple internal reflections and shortening mass-transport pathways as well as; the locally tailored electronic environment of the Cu sites, which facilitates charge separation and CO<sub>2</sub> activation. These results establish morphology-controlled COFs with atomically dispersed metals as an effective platform for tuning active-site electronics and advancing selective CO<sub>2</sub> reduction into CO.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"102 ","pages":"Article 103282"},"PeriodicalIF":8.4,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145614766","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}
Pub Date : 2025-12-01DOI: 10.1016/j.jcou.2025.103287
Temesgen Abeto Amibo , Donata Konopacka-Łyskawa
This research aimed to optimize the mineral carbonation of gypsum in the presence of butanediol (BUD) to enhance carbon dioxide capture efficiency, and suppress ammonia desorption from the reactive mixture. The influence of the investigated parameters on the characteristics of the obtained calcium carbonate-rich particles was also examined. Previous studies have demonstrated that BUD enhances CO2 absorption and reduces ammonia volatilization. The carbonation reaction was conducted in a batch reactor under atmospheric pressure and ambient temperature, minimizing operational costs. The investigated parameters included the NH₃:Ca molar ratio, stirring speed, and BUD concentration. The CO2 concentration in the inlet gas stream (15 % v/v) was selected to simulate typical post-combustion flue gas conditions. During the reaction, the pH of the mixture, CO2 concentration, and ammonia concentration in the exhaust gas were continuously monitored. Based on the experimental data, the CO2 absorption efficiency, ammonia desorption rate, and CaCO3 content in the final product were determined. The optimal values achieved were: CO2 absorption efficiency of 84.56 %, ammonia desorption inhibition efficiency of 50.00 %, and CaCO3 content of 88.49 %. Additionally, the highest vaterite content in the CaCO3 powder reached 86.99 %. The specific surface area of the CaCO3 powder peaked at 5.18 m²/g, with a pore volume of 0.000346 m³ /g. All tested parameters remarkably influenced CO2 absorption, ammonia desorption inhibition, and CaCO3 concentration in the product (p-values < 0.05), except for stirring speed, which did not significantly affect CO₂ absorption (p > 0.05).
{"title":"Butanediol-assisted direct carbonation of gypsum in ammonia solution at ambient temperature: Influence of process parameters on CO2 capture","authors":"Temesgen Abeto Amibo , Donata Konopacka-Łyskawa","doi":"10.1016/j.jcou.2025.103287","DOIUrl":"10.1016/j.jcou.2025.103287","url":null,"abstract":"<div><div>This research aimed to optimize the mineral carbonation of gypsum in the presence of butanediol (BUD) to enhance carbon dioxide capture efficiency, and suppress ammonia desorption from the reactive mixture. The influence of the investigated parameters on the characteristics of the obtained calcium carbonate-rich particles was also examined. Previous studies have demonstrated that BUD enhances CO<sub>2</sub> absorption and reduces ammonia volatilization. The carbonation reaction was conducted in a batch reactor under atmospheric pressure and ambient temperature, minimizing operational costs. The investigated parameters included the NH₃:Ca molar ratio, stirring speed, and BUD concentration. The CO<sub>2</sub> concentration in the inlet gas stream (15 % v/v) was selected to simulate typical post-combustion flue gas conditions. During the reaction, the pH of the mixture, CO<sub>2</sub> concentration, and ammonia concentration in the exhaust gas were continuously monitored. Based on the experimental data, the CO<sub>2</sub> absorption efficiency, ammonia desorption rate, and CaCO<sub>3</sub> content in the final product were determined. The optimal values achieved were: CO<sub>2</sub> absorption efficiency of 84.56 %, ammonia desorption inhibition efficiency of 50.00 %, and CaCO<sub>3</sub> content of 88.49 %. Additionally, the highest vaterite content in the CaCO<sub>3</sub> powder reached 86.99 %. The specific surface area of the CaCO<sub>3</sub> powder peaked at 5.18 m²/g, with a pore volume of 0.000346 m³ /g. All tested parameters remarkably influenced CO<sub>2</sub> absorption, ammonia desorption inhibition, and CaCO<sub>3</sub> concentration in the product (p-values < 0.05), except for stirring speed, which did not significantly affect CO₂ absorption (p > 0.05).</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"102 ","pages":"Article 103287"},"PeriodicalIF":8.4,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145614770","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}
Pub Date : 2025-12-01DOI: 10.1016/j.jcou.2025.103280
Taozhu Li , Farzaneh Shamsa
The electrochemical reduction of CO₂ into value-added hydrocarbon fuels remains a grand challenge due to sluggish multielectron transfer kinetics and the limited stability of existing photocathodes. In this work, we report the design of a novel hybrid DFNT@MOF-Metal photoelectrocatalyst, in which transition metal based MOFs (Zn, Ni, Co, Mg) are uniformly anchored on dendritic fibrous nanotitania (DFNT). The hierarchical DFNT scaffold provides a three dimensional open-channel architecture with high surface area, ensuring homogeneous dispersion of MOF-metal nanodomains and facilitating efficient electron transport. The MOF-metal active sites, in turn, enable enhanced CO₂ adsorption, activation, and catalytic turnover through synergistic electronic interactions. Electrochemical tests under visible-light-assisted conditions revealed that DFNT@MOF-Metal catalysts exhibited significantly reduced charge transfer resistance and enhanced current density compared to pristine DFNT and MOF only references. Among the tested compositions, DFNT@MOF-Ni demonstrated the highest Faradaic efficiency and methane selectivity, while DFNT@MOF-Co, DFNT@MOF-Zn, and DFNT@MOF-Mg also showed improved performance over their single component counterparts. Kinetic analysis confirmed a pseudo first order reaction pathway for CO₂ to CH₄ conversion, and stability tests indicated negligible activity loss over ten consecutive electrochemical cycles. These findings establish DFNT@MOF-Metal hybrids as efficient, stable, and recyclable photoelectrocatalysts for selective CO₂ electroreduction, highlighting the critical role of DFNT morphology and multimetallic MOF centers in driving sustainable CO₂ to hydrocarbon energy conversion.
{"title":"Electrochemical CO₂ reduction to hydrocarbons using DFNT@MOF-Metal as a hybrid photoelectrocatalyst","authors":"Taozhu Li , Farzaneh Shamsa","doi":"10.1016/j.jcou.2025.103280","DOIUrl":"10.1016/j.jcou.2025.103280","url":null,"abstract":"<div><div>The electrochemical reduction of CO₂ into value-added hydrocarbon fuels remains a grand challenge due to sluggish multielectron transfer kinetics and the limited stability of existing photocathodes. In this work, we report the design of a novel hybrid DFNT@MOF-Metal photoelectrocatalyst, in which transition metal based MOFs (Zn, Ni, Co, Mg) are uniformly anchored on dendritic fibrous nanotitania (DFNT). The hierarchical DFNT scaffold provides a three dimensional open-channel architecture with high surface area, ensuring homogeneous dispersion of MOF-metal nanodomains and facilitating efficient electron transport. The MOF-metal active sites, in turn, enable enhanced CO₂ adsorption, activation, and catalytic turnover through synergistic electronic interactions. Electrochemical tests under visible-light-assisted conditions revealed that DFNT@MOF-Metal catalysts exhibited significantly reduced charge transfer resistance and enhanced current density compared to pristine DFNT and MOF only references. Among the tested compositions, DFNT@MOF-Ni demonstrated the highest Faradaic efficiency and methane selectivity, while DFNT@MOF-Co, DFNT@MOF-Zn, and DFNT@MOF-Mg also showed improved performance over their single component counterparts. Kinetic analysis confirmed a pseudo first order reaction pathway for CO₂ to CH₄ conversion, and stability tests indicated negligible activity loss over ten consecutive electrochemical cycles. These findings establish DFNT@MOF-Metal hybrids as efficient, stable, and recyclable photoelectrocatalysts for selective CO₂ electroreduction, highlighting the critical role of DFNT morphology and multimetallic MOF centers in driving sustainable CO₂ to hydrocarbon energy conversion.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"102 ","pages":"Article 103280"},"PeriodicalIF":8.4,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145614765","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}
Pub Date : 2025-12-01DOI: 10.1016/j.jcou.2025.103283
Jianshan Li , Jiuzheng Yu , Rahele Zhiani
In this work, Sm₂XMnO₆ (X = Co, Cr, Fe) nanocatalysts with high surface area and readily accessible active sites were successfully synthesized using a simple strategy based on dendritic fibrous nanosilica (DFNS). The DFNS surface was functionalized with hyperbranched polyglycerol (HPG) groups containing multiple carboxyl moieties, which served as robust anchoring sites. This modification enabled the uniform dispersion of Sm₂XMnO₆ nanoparticles across the DFNS fibers without aggregation, while the amplification effect of HPG facilitated high loading capacities. Acting as stable and reusable heterogeneous catalysts, the DFNS/HPG/Sm₂XMnO₆ composites effectively promoted the transformation of anilines, CO₂, and olefins into 3-aryl-2-oxazolidinones. The fibrous DFNS structure not only enhanced adsorption capacity but also allowed straightforward recovery of the catalyst without significant loss of yield, owing to its strong chemical durability. With excellent mechanical strength, ionic conductivity, thermal stability, and colloidal persistence, the system represents an ideal nanocatalyst within a host guest framework. A broad range of olefins, regardless of electronic properties, were converted into desired products, while the heterogeneous catalytic environment posed no barriers to reaction progress. The 3-aryl-2-oxazolidinones could be readily isolated from the reaction mixture, and the DFNS/HPG/Sm₂XMnO₆ catalyst was efficiently recycled through several runs without significant loss of activity or selectivity.
{"title":"Sm₂XMnO₆ (X = Co, Cr, and Fe) linked HPG on dendritic nanosilica as a recyclable green catalyst for eco-friendly synthesis of oxazolidinones from carbon dioxide","authors":"Jianshan Li , Jiuzheng Yu , Rahele Zhiani","doi":"10.1016/j.jcou.2025.103283","DOIUrl":"10.1016/j.jcou.2025.103283","url":null,"abstract":"<div><div>In this work, Sm₂XMnO₆ (X = Co, Cr, Fe) nanocatalysts with high surface area and readily accessible active sites were successfully synthesized using a simple strategy based on dendritic fibrous nanosilica (DFNS). The DFNS surface was functionalized with hyperbranched polyglycerol (HPG) groups containing multiple carboxyl moieties, which served as robust anchoring sites. This modification enabled the uniform dispersion of Sm₂XMnO₆ nanoparticles across the DFNS fibers without aggregation, while the amplification effect of HPG facilitated high loading capacities. Acting as stable and reusable heterogeneous catalysts, the DFNS/HPG/Sm₂XMnO₆ composites effectively promoted the transformation of anilines, CO₂, and olefins into 3-aryl-2-oxazolidinones. The fibrous DFNS structure not only enhanced adsorption capacity but also allowed straightforward recovery of the catalyst without significant loss of yield, owing to its strong chemical durability. With excellent mechanical strength, ionic conductivity, thermal stability, and colloidal persistence, the system represents an ideal nanocatalyst within a host guest framework. A broad range of olefins, regardless of electronic properties, were converted into desired products, while the heterogeneous catalytic environment posed no barriers to reaction progress. The 3-aryl-2-oxazolidinones could be readily isolated from the reaction mixture, and the DFNS/HPG/Sm₂XMnO₆ catalyst was efficiently recycled through several runs without significant loss of activity or selectivity.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"102 ","pages":"Article 103283"},"PeriodicalIF":8.4,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145614767","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}
Pub Date : 2025-11-21DOI: 10.1016/j.jcou.2025.103278
Linjie Wu, Suyang Ji, Yong Zhu, Xiaoyong Yang, Bingjie Wang
In this work, a novel nanofluid containing amino-modified carbon nanoparticles with enhanced stability and performance was prepared for CO2 absorption. SEM, TEM, EDS, FT-IR, Raman and XPS were employed to characterize the micro-structure, element, functional groups of the amine functionalized carbon nanosphere particles (APTES-CNSs). Moreover, APTES-CNSs nanofluids stability was comprehensively evaluated by Ultraviolet-visible spectrophotometer (UV-Vis). The CO2 absorption performance experiments, including the effect of solid content, temperature, amine solution concentration and flow rate, were carried out in a batch. The results indicated that a high stability of APTES-CNSs in the N-methyldiethanolamine (MDEA) solution. Besides, under the condition of 0.8 g/L solid content and the temperature of 30℃, the enhancement index of CO2 absorption was more significant and reached 1.25 compared with the amine solution. The advantageous performance ensured the potential of APTES-CNSs nanofluids as advanced absorbents.
{"title":"A novel nanofluid containing modified carbon nanoparticles with enhanced stability and performance for CO2 absorption: Preparation, characterization and mechanism","authors":"Linjie Wu, Suyang Ji, Yong Zhu, Xiaoyong Yang, Bingjie Wang","doi":"10.1016/j.jcou.2025.103278","DOIUrl":"10.1016/j.jcou.2025.103278","url":null,"abstract":"<div><div>In this work, a novel nanofluid containing amino-modified carbon nanoparticles with enhanced stability and performance was prepared for CO<sub>2</sub> absorption. SEM, TEM, EDS, FT-IR, Raman and XPS were employed to characterize the micro-structure, element, functional groups of the amine functionalized carbon nanosphere particles (APTES-CNSs). Moreover, APTES-CNSs nanofluids stability was comprehensively evaluated by Ultraviolet-visible spectrophotometer (UV-Vis). The CO<sub>2</sub> absorption performance experiments, including the effect of solid content, temperature, amine solution concentration and flow rate, were carried out in a batch. The results indicated that a high stability of APTES-CNSs in the N-methyldiethanolamine (MDEA) solution. Besides, under the condition of 0.8 g/L solid content and the temperature of 30℃, the enhancement index of CO<sub>2</sub> absorption was more significant and reached 1.25 compared with the amine solution. The advantageous performance ensured the potential of APTES-CNSs nanofluids as advanced absorbents.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"102 ","pages":"Article 103278"},"PeriodicalIF":8.4,"publicationDate":"2025-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145568544","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}
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