Journal of CO2 Utilization最新文献

{"title":"Formation of selected organic compounds from aqueous sodium carbonate solution via hetero-coupling of carbon and hydrogen by in-liquid plasma","authors":"Ryota Shiba ,&nbsp;Shinfuku Nomura ,&nbsp;Akihiro Kakubo ,&nbsp;Kohei Baba ,&nbsp;Ryo Shimizu ,&nbsp;Junichi Nakajima ,&nbsp;Teruo Henmi","doi":"10.1016/j.jcou.2025.103159","DOIUrl":"10.1016/j.jcou.2025.103159","url":null,"abstract":"<div><div>This study explores an in-liquid plasma process for converting carbon dioxide into value-added organic compounds using aqueous sodium carbonate solutions derived from CO₂ captured by sodium hydroxide. The method operates without hydrogen gas or catalysts, aligning with carbon-neutral strategies. During plasma treatment, the measured emission spectroscopy (ES) confirmed the formation of reactive species, including CH (431, 387 nm), CO (336, 295 nm), OH (308, 283, 282 nm), O (777, 845 nm), and H radicals (656 nm [H_α], 486 nm [H_β]). Electron temperature estimated by [H_β]/[H_α] of ES is in the range between 4500 and 5500 K for this plasma condition. These species are generated via vibronic coupling: interactions between molecular vibrations and orbital electronic states in CO₂ and H₂O at these plasma temperatures. CH radicals, formed by hetero-coupling of C and H, play a key role in subsequent synthesis. Gas chromatography-mass spectrometry (GC-MS) at quenching process detected acetone (retention time: 1.56 min) and ethanol (2.06 min). <em>Ab initio</em> calculations reveal the reaction pathways: 2 CH + 4 H + CO → CH₃COCH₃ ，2 CH + 3 H + OH → C₂H₅OH. The yield of acetone (8 mg/L) is lower compared with ethanol (14.3 mg/L) under the cooling conditions. The process proceeds through repeated plasma–quenching cycles, approaching an apparent chemical equilibrium within 60 min. This plasma method demonstrates an efficient and sustainable route for CO₂ utilization of carbonate and water, offering a promising approach for carbon-neutral fuel production and Carbon Capture, Utilization, and Storage (CCUS) process.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"99 ","pages":"Article 103159"},"PeriodicalIF":7.2,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144481679","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":"Catalytic performance and hydrogen spillover in Cu/ZnO/Al2O3: Insights from DFT calculations on alkali and alkaline earth oxides promoters for CO2 hydrogenation","authors":"Mohammad Sadegh Arabahmadi ,&nbsp;Reza Golhosseini ,&nbsp;Masoud Safari Yazd ,&nbsp;Fereshteh Meshkani","doi":"10.1016/j.jcou.2025.103162","DOIUrl":"10.1016/j.jcou.2025.103162","url":null,"abstract":"<div><div>This study evaluates Cu/ZnO/Al₂O₃ catalysts promoted with K₂O, BaO, Cs₂O, and SrO for CO₂ hydrogenation to methanol, focusing on the effect of synthesis methods. Catalysts prepared via co-precipitation and impregnation were evaluated for activity, selectivity, and stability under industrial conditions. Analyses (H₂-TPR, H₂/CO₂-TPD, XRD) showed potassium and barium improve copper reducibility, enhance H₂/CO₂ adsorption, and reduce sintering through strong promoter-support interactions. Co-precipitated potassium demonstrated superior performance, achieving higher methanol production rates, improved stability, and minimal deactivation, with methanol selectivity exceeding 86 % and CO₂ conversion surpassing 42 %. In contrast, impregnated Potassium increased CO formation, highlighting the significance of the synthesis strategy. DFT calculations revealed that K₂O and BaO promote strong H₂/CO₂ adsorption and favorable reaction pathways. These findings offer valuable insights into optimizing promoter selection and synthesis techniques for advanced catalysts, enabling efficient CO₂ conversion and sustainable methanol production.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"99 ","pages":"Article 103162"},"PeriodicalIF":7.2,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144481680","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":"Enhancing photoelectrochemical CO2 reduction: The impact of polyelectrolytes modification on copper oxide catalysts","authors":"Nabila Nawaz ,&nbsp;Krzysztof Bienkowski ,&nbsp;Karthick Ramalingam ,&nbsp;Aleksandra Parzuch ,&nbsp;Piotr Wróbel ,&nbsp;Marcin Strawski ,&nbsp;Renata Solarska","doi":"10.1016/j.jcou.2025.103160","DOIUrl":"10.1016/j.jcou.2025.103160","url":null,"abstract":"<div><div>Reducing CO₂ into value-added chemicals and fuels by artificial photosynthesis is a critical turnover in research as one of the considerable solutions to global environmental and energy issues. Copper (I) oxide (Cu₂O), a low-cost semiconductor, is one of the promising candidates for application in CO₂RR systems. However, the performance is still unsatisfactory, and the products, like acids and alcohols, can be obtained regarding the system parameters. Cu₂O's main drawback is its susceptibility to photo corrosion, which limits its effectiveness in the CO₂ reduction reaction (CO₂RR) due to instability. The presence of Cu⁺ on the electrode surface is essential for suppressing hydrogen evolution and improving CO₂RR selectivity. In this study, we explore the use of polyethyleneimine (PEI) to enhance the performance of Cu₂O electrodes and protect against photo corrosion. We hypothesized that PEI's amine groups would bind CO₂ and facilitate its transformation into intermediate products during reduction reactions. Chronoamperometry and mass spectrometry results showed that, after 20 h, the photostability of PEI-coated electrodes was significantly improved compared to bare Cu₂O. Under illumination at 0.3 V vs. RHE, the PEI@Cu₂O photocathode produces methanol, ethanol, and formate species. Our preliminary findings suggest that PEI might be an effective tool for CO₂ capture and utilization.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"99 ","pages":"Article 103160"},"PeriodicalIF":7.2,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144472478","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":"Control of electrolyte intrusion in carbon-free silver gas diffusion electrodes for electrochemical CO2 reduction","authors":"Inga Dorner ,&nbsp;Jens Osiewacz ,&nbsp;Philipp Röse ,&nbsp;Barbara Ellendorff ,&nbsp;Maximilian Röhe ,&nbsp;Thomas Turek ,&nbsp;Ulrike Krewer","doi":"10.1016/j.jcou.2025.103163","DOIUrl":"10.1016/j.jcou.2025.103163","url":null,"abstract":"<div><div>Achieving high conversion rates in electrochemical CO₂ reduction requires gas diffusion electrodes to ensure sufficient CO₂ availability at the electrode surface. Carbon-free Ag electrodes offer superior stability compared to carbon-based ones but are challenged by complex electrolyte intrusion and distribution. This study combines experimental variations in electrode design and operating parameters with modeling to identify key factors for high Faradaic efficiency towards CO and high current densities. Results emphasize the importance of an optimal gas/liquid interface. Increasing gas-side overpressure from 60 to 100 mbar doubled the Faradaic efficiency for CO from 20 % to 42 % at 200 mA cm⁻² due to higher local CO₂ concentrations in electrolyte-flooded regions. Thin electrodes of 200 µm outperformed thicker ones up to 390 µm, achieving higher efficiencies by enhancing CO₂ and electrolyte transport, which lowered local pH levels. Optimizing PTFE content further improved performance; reducing PTFE from 2 to 1 wt% increased Faradaic efficiency by 20 % at 200 mA cm⁻² by balancing hydrophobicity and active surface exposure. These insights into the relationship between electrode properties, operating conditions, and gas-liquid distribution advance the design of gas diffusion electrodes for competitive CO₂ reduction applications.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"99 ","pages":"Article 103163"},"PeriodicalIF":7.2,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144366656","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":"CO2 solubilities in low-density polyethylene (LDPE) in its molten state over high temperatures and pressures conditions","authors":"Rizqy Romadhona Ginting,&nbsp;Ikuo Ushiki,&nbsp;Kanako Otsubo","doi":"10.1016/j.jcou.2025.103164","DOIUrl":"10.1016/j.jcou.2025.103164","url":null,"abstract":"<div><div>This study investigates the solubility behavior of carbon dioxide (CO₂) in low-density polyethylene (LDPE) under molten conditions across a broad temperature range (398–473 K) and pressures up to 20 MPa. CO₂ solubility was determined using a magnetic suspension balance and quantitatively modeled with the Sanchez–Lacombe equation of state. Results indicate that CO₂ solubility increases linearly with pressure and decreases with temperature, consistent with typical condensable gas behavior. The model achieved high accuracy, with an average relative deviation of less than 0.9 %. Derived Henry’s constants and interaction parameters further clarify the thermodynamic interactions between CO₂ and LDPE, providing critical insights for optimizing polymer foaming processes. For comparison, nitrogen solubility was also measured, exhibiting lower values and an opposite temperature dependence, which highlights the distinct dissolution mechanisms of the two gases.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"99 ","pages":"Article 103164"},"PeriodicalIF":7.2,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144338703","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":"Design of novel inverse ZrO2/Ni catalysts for CO2 utilization: From CO2 to syn-methane","authors":"Li Li ,&nbsp;Xueshuang Wu ,&nbsp;Jing Yang ,&nbsp;Changwei Hu ,&nbsp;Patrick Da Costa","doi":"10.1016/j.jcou.2025.103161","DOIUrl":"10.1016/j.jcou.2025.103161","url":null,"abstract":"<div><div>The conversion of CO₂ has garnered significant attention due to escalating environmental and resource concerns. The metal-oxide (M-O) interface plays a pivotal role in catalysis, guiding the design of highly active catalysts. Unlike conventional catalysts, inverse catalysts load small inert oxide nanoparticles onto large active metal substrates, emphasizing the importance of the O-M interface. In this study, we synthesized and characterized various ZrO₂/Ni catalysts using a range of techniques, including XRD, BET, H₂-TPR, CO₂-TPD, quasi <em>in-situ</em> XPS, TEM, HRTEM, and <em>in-situ</em> DRIFTS. 70ZrO₂/30Ni catalyst exhibited the highest catalytic performance, attributed to its optimal balance of Ni and ZrO₂, which provided a high ratio of metallic Ni, an increased concentration of oxygen vacancies and more basic sites. These features facilitated efficient CO₂ adsorption and activation, resulting in superior catalytic activity. <em>In-situ</em> DRIFTS experiments revealed that the CO₂ methanation mechanism follows the formate pathway on inverse ZrO₂/Ni catalysts. These findings offer valuable insights into the design and optimization of ZrO₂/Ni catalysts for CO₂ methanation.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"99 ","pages":"Article 103161"},"PeriodicalIF":7.2,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144366805","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":"Supercritical CO2 extraction behavior of electrolyte solvents from Li-ion battery black mass","authors":"Nils Zachmann,&nbsp;Burçak Ebin","doi":"10.1016/j.jcou.2025.103145","DOIUrl":"10.1016/j.jcou.2025.103145","url":null,"abstract":"<div><div>Electrolyte recovery from spent Li-ion batteries remains a significant challenge in the current recycling process. Li-ion battery waste streams containing electrolyte residues are classified as hazardous waste and entail a financial and workplace safety burden for the recycling industry. Recent studies show the potential use of supercritical CO₂ extraction for the recovery of electrolyte solvents. In this study, the extraction behavior of electrolyte solvents from Li-ion battery black mass using supercritical CO₂ process under pressures of 100 and 140 bar at 40°C was investigated. The extraction yield of dimethyl carbonate, ethyl methyl carbonate, and diethyl carbonate exceeded 99 % at both pressures. Ethylene carbonate, biphenyl, and propylene carbonate were successfully extracted with an extraction yield exceeding 95 % using 140 bar and 40°C. The extraction rates of biphenyl, ethylene carbonate and propylene carbonate at 140 bar and 40°C in the linear extraction regime of the extraction curve were determined to be 0.18 mg/g CO₂, 1.9 mg/g CO₂ and 0.4 mg/g CO₂, respectively. The research demonstrates that supercritical CO₂ processing is a highly promising method not only for recycling electrolytes but also for mitigating the hazardous risks associated with battery waste.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"99 ","pages":"Article 103145"},"PeriodicalIF":7.2,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144331165","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":"Techno-economic assessment of an integrated GTL facility for urea production","authors":"Kelvin Awani ,&nbsp;Navid Khallaghi ,&nbsp;Vinod Kumar ,&nbsp;Seyed Ali Nabavi","doi":"10.1016/j.jcou.2025.103157","DOIUrl":"10.1016/j.jcou.2025.103157","url":null,"abstract":"<div><div>Decarbonising industrial processes remains a critical challenge, particularly in gas-to-liquid (GTL) and chemical manufacturing sectors. This study conducts a comprehensive techno-economic assessment of an integrated GTL-urea facility that leverages hydrogen from Fischer-Tropsch (FT) tail gas and green hydrogen via proton exchange membrane (PEM) electrolysis. Using ASPEN Plus simulations, process synergies, emission reductions, and profitability are analysed across multiple configurations. Key findings indicate that utilising internally generated hydrogen is more cost-effective, achieving a 4 % reduction in equipment costs, lowering total equipment cost from $2.58 billion in the base case to $2.47 billion. This results in a total annualised cost saving of $225 million and a 32 % increase in profitability, raising annual profits from $412 million in the base case to $543 million.</div><div>The integration efficiently repurposes CO₂ emissions and nitrogen-rich waste streams to produce urea, demonstrating strong potential for promoting circularity . It enhances carbon efficiency to 84 % reducing overall emission from 180 tonnes CO₂e/h in the business-as-usual case to 135 tonnes CO₂e/h while PEM-based hydrogen reduces emissions by 14 tonnes CO₂e/h compared to internally generated hydrogen. The high capital and operational costs due to electricity demands for PEM-based hydrogen process limit its viability. The study identifies the 9 tonnes/h internally generated hydrogen configuration as the optimal solution, offering significant emission reductions and financial benefits. These findings highlight the importance of process integration, renewable energy, and advanced hydrogen strategies for industrial decarbonisation, providing a sustainable pathway for GTL and urea production in line with global net-zero goals.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"99 ","pages":"Article 103157"},"PeriodicalIF":7.2,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144331164","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":"Stoichiometric perovskites as new class supports for Fe and Co in Fischer Tropsch Synthesis: A review","authors":"Nothando Cynthia Shiba","doi":"10.1016/j.jcou.2025.103151","DOIUrl":"10.1016/j.jcou.2025.103151","url":null,"abstract":"<div><div>Direct hydrogenation of CO₂ to produce low-carbon footprint chemicals using multifunctional catalysts is among the most practical approaches to CO₂ utilisation. Iron (Fe) and Cobalt (Co) catalysts are widely used in Fischer Tropsch Synthesis (FTS) due to their high activity and selectivity, however, their performance is significantly influenced by the choice of support material. Due to their unique structural stability, tunable redox properties, strong metal-support interactions, perovskites are used in a wide range of gas-solid reactions and have emerged as promising supports in FTS. Recent studies show that the perovskite's A- and B-site cation selection, critically affects the reducibility and dispersion of the active phase, thereby impacting the FTS activity and selectivity. Furthermore, the lattice oxygen in stoichiometric perovskites can modulate the surface chemistry, thus influencing the adsorption and activation of CO or CO₂, and the hydrocarbon chain propagation. Emerging research have explored doping with high valence state elements to introduce charge imbalance to improve oxygen mobility, catalyst stability and enhance theexsolution of Co⁰ and Fe⁰ under H₂, thus increasing active site density and catalyst activity. This review highlights the role of stoichiometric perovskites as functionally supportive scaffolds in FTS (both CO and CO₂ hydrogenation), offering pathways to design robust, high-performance cobalt and iron catalysts for synthetic fuel production. The structural evolutions and thermochemical behaviour are discussed with respect to additional cations incorporated into the new class perovskites support lattice. The mechanisms governing this reaction are outlined; and finally, the current state of research on perovskite-supported catalysts in FTS is discussed.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"99 ","pages":"Article 103151"},"PeriodicalIF":7.2,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144331224","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":"Robust machine learning models for calculating the carbon dioxide desublimation point within natural gas mixtures at low temperature conditions","authors":"Walid Abdelfattah ,&nbsp;Munthar Kadhim Abosaoda ,&nbsp;Dharmesh Sur ,&nbsp;Menon Soumya V ,&nbsp;Prabhat Kumar Sahu ,&nbsp;Kamred Udham Singh ,&nbsp;R. Sivaranjani ,&nbsp;Rohit Chauhan ,&nbsp;Siya Singla ,&nbsp;Fereydoon Ranjbar","doi":"10.1016/j.jcou.2025.103150","DOIUrl":"10.1016/j.jcou.2025.103150","url":null,"abstract":"<div><div>Desublimation at low temperatures offers an efficient method for removing CO₂ from gas streams. Accurate prediction of the carbon dioxide desublimation temperature (CDDT) is essential for applying this method in natural gas processing. This investigation aimed to develop predictive tools utilizing machine learning approaches to estimate CDDT within natural gas mixtures. To reach this target, a large data set comprising 430 measurements obtained from published sources, was prepared. These data points cover the CDDT in binary and ternary natural gas mixtures under different pressures and gas fractions. In addition to black-box tools such as Decision Tree (DT), Gaussian Process Method (GPM) and Adaptive Neuro-Fuzzy Inference System (ANFIS) methods, a mathematical equation was developed via Genetic Programming (GP) technique for CDDT calculation. The performances of the designed models were rigorously evaluated through various visual inspections and statistical indices. While all models demonstrated excellent predictive accuracy, the GPM model provided superior results among black-box tools, exhibiting a mean absolute percentage error (MAPE) of 0.99 %. Furthermore, the GP equation achieved an overall MAPE of 0.65 % for the CDDT data. The intelligent models also performed well in predicting the data pertinent to both binary and ternary mixtures. A series of simulations based on the models’ outcomes were carried out to depict the CDDT variations in response to operational parameters, and the findings showed full consistency with previous experimental results. Ultimately, a sensitivity analysis was conducted to pinpoint the dominant factors affecting the CO₂ desublimation. Overall, the outcomes of this research enhance the understanding of CDDT behavior and provide valuable information for optimizing low-temperature CO₂ capture processes used in natural gas purification.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"99 ","pages":"Article 103150"},"PeriodicalIF":7.2,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144312846","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}