Journal of CO2 Utilization最新文献

{"title":"Combining enhanced basalt weathering with soda saline soil: A novel CO₂ mineralisation strategy","authors":"Lianghan Cong,&nbsp;Shuaiyi Lu,&nbsp;Pan Jiang,&nbsp;Xiaoshu Lü","doi":"10.1016/j.jcou.2026.103606","DOIUrl":"10.1016/j.jcou.2026.103606","url":null,"abstract":"<div><div>Enhanced rock weathering in saline–alkaline soils can couple CO₂ mineralisation with reclamation of salt-affected land. We incubated 30 g basalt with 30 g sodic saline soil for 90 days at 15 °C using three particle sizes (0.074, 0.42 and 5 mm) and two water additions (30 and 60 g). Endpoint aqueous chemistry, SEM–EDS, thermogravimetric analysis and PHREEQC saturation modelling were integrated with a regional life-cycle assessment for Jilin Province, China. Endpoint Ca accounting yielded apparent weathered-basalt masses, which were converted using a primary Ca-only carbonate capacity of 0.072 g CO₂ g⁻¹ basalt and an all-base-cation carbonate-equivalent upper capacity of 0.142 g CO₂ g⁻¹ basalt. Particle-size-specific effective rates linked the incubation results to 30-year weathering trajectories. Gross CDR reached 72.45–72.47 kg CO₂ t⁻¹ basalt in the primary case and 141.92–141.96 kg CO₂ t⁻¹ basalt in the upper case. Across twelve scenarios, primary-case net CDR ranged from −5.53 to 38.45 kg CO₂-eq t⁻¹ basalt, while upper-case net CDR ranged from 63.96 to 107.92 kg CO₂-eq t⁻¹ basalt. Net-removal costs ranged from USD 1327–29,328 t⁻¹ CO₂ in the primary net-removing scenarios and from USD 473–4667 t⁻¹ CO₂ in the upper case. The identified 6376,490 ha of Jilin cropland, equivalent to 482.06 Mt basalt at 75.6 t ha⁻¹ , had gross capacities of 34.93 Mt CO₂ (primary) and 68.43 Mt CO₂ (upper). Finer particles reached the composition-controlled capacity sooner, whereas coarse basalt had lower supply-chain emissions in the evaluated scenarios.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"113 ","pages":"Article 103606"},"PeriodicalIF":8.6,"publicationDate":"2026-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149363753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Closed-loop CO2 capture and utilization during biomass gasification","authors":"Viktória Zsinka,&nbsp;Adél Kollár,&nbsp;Norbert Miskolczi","doi":"10.1016/j.jcou.2026.103609","DOIUrl":"10.1016/j.jcou.2026.103609","url":null,"abstract":"<div><div>Biomass gasification is a promising thermochemical conversion technology for producing renewable synthesis gas; however, the significant amount of generated CO₂ during the process reduces gas quality and carbon utilization efficiency. Integrating carbon capture with thermochemical conversion offers an opportunity to improve both process sustainability and resource efficiency. In this study, a closed-loop CO₂ capture and utilization system was developed by coupling post-situ adsorption with biomass gasification. Maize biomass was thermally pretreated at 200–500°C before gasification at 800°C and 900°C. The produced CO₂ was captured using cattle manure derived biochar, while the desorption was made at 80°C where the gases were subsequently recycled into the gasification process. Thermal pretreatment and CO₂ reutilization significantly enhanced gasification performance, with the highest syngas yield. The proposed approach demonstrates that captured CO₂ can effectively be recycled as a gasification agent, improving synthesis gas quality while promoting carbon circularity and reducing process related CO₂ emissions.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"113 ","pages":"Article 103609"},"PeriodicalIF":8.6,"publicationDate":"2026-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149363749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Carrier-dependent pressure of maximum loading in supercritical CO₂ drug impregnation: Ibuprofen and ketoprofen in MCM-48 with a three-dimensional pore network","authors":"Yuto Asai,&nbsp;Ikuo Ushiki","doi":"10.1016/j.jcou.2026.103613","DOIUrl":"10.1016/j.jcou.2026.103613","url":null,"abstract":"<div><div>Mesoporous silica is an attractive carrier for poorly water-soluble drugs, and supercritical fluid deposition (SCFD) with CO₂ loads them without organic solvents. The loading passes through a maximum with impregnation pressure, commonly attributed to the opposing effects of CO₂ density on drug solubility and competitive CO₂ adsorption. Because solubility is a property of the drug–CO₂ pair alone, the pressure of the maximum might be assumed transferable between carriers, but pressure-resolved data for ordered mesoporous silicas exist only for one-dimensional channels. Ibuprofen and ketoprofen were impregnated into MCM-48, with a three-dimensional bicontinuous pore network, at 333 K and 8–21 MPa; loadings were measured by thermogravimetry and pore structures by nitrogen adsorption. Among the pressures examined, the loading of both drugs was highest at 18 MPa, versus 15 MPa in published SBA-15 data. The ketoprofen data support the shift: loading fell by 33% from 15 to 17 MPa on SBA-15 but rose by 20% from 15 to 18 MPa on MCM-48; for ibuprofen, the differences near the maximum are within the reproducibility. As the silicas also differ in surface area and pore size, its cause was not isolated. The occupied-volume ratio <em>R</em>, the pore volume made inaccessible to nitrogen per volume of drug loaded, was 0.8–1.1 for ibuprofen up to 18 MPa and 2.2–3.2 for ketoprofen, which we interpret as nearly volumetric filling by ibuprofen and obstruction of pore entrances by ketoprofen. The pressure of maximum loading thus depends on the carrier and should be verified for each drug–carrier system.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"113 ","pages":"Article 103613"},"PeriodicalIF":8.6,"publicationDate":"2026-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149364200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Simultaneous conversion of carbon dioxide and methane using thermal plasma","authors":"Hye Young Ko,&nbsp;Yong Hee Lee,&nbsp;Hyeokjun Kang,&nbsp;Subin Yang,&nbsp;Jeong-Hwan Oh,&nbsp;Sooseok Choi","doi":"10.1016/j.jcou.2026.103605","DOIUrl":"10.1016/j.jcou.2026.103605","url":null,"abstract":"<div><div>This study presents the thermal plasma-based process for the simultaneous conversion of carbon dioxide (CO₂) and methane (CH₄), targeting the production of hydrogen (H₂) and value-added solid carbon without catalysts. The triple thermal plasma torch system was employed, enabling direct injection of process gases into the high-temperature plasma zone. Three different gas injection configurations were tested: simultaneous CO₂ and CH₄ injection through the co-flow injection nozzle, and separate injections through the co-flow and counter-flow injection nozzles. Simultaneous co-flow injection achieved CO₂ and CH₄ conversion rates of approximately 96.5% and 98.8%, respectively, with H₂ and CO selectivities of 87.2% and 77.3%, respectively. The corresponding specific energy requirement for H₂ production was 159.74 kWh/kg-H₂. The recovered-carbon yields were 1.55% and 4.66% under conditions 2 and 3, respectively, relative to the total carbon supplied in CH₄ and CO₂. Carbon flakes with a layered structure were obtained when CH₄ was injected via the co-flow nozzle and CO₂ via the counter-flow nozzle, as characterized by Raman spectroscopy and TEM analysis. Conversely, carbon black-like material was obtained when CO₂ was injected through the co-flow nozzle and CH₄ through the counter-flow nozzle. These results highlight the influence of process gas injection configuration on gaseous product performance, solid carbon recovery, and recovered carbon structure.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"113 ","pages":"Article 103605"},"PeriodicalIF":8.6,"publicationDate":"2026-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149364201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Integrated green processing for cannabidiol production: Supercritical CO₂ extraction followed by optimized thin-film distillation and crystallization","authors":"Min Hong,&nbsp;Joon-Hee Han,&nbsp;Jong-Hui Kim,&nbsp;Ka Hee Park,&nbsp;Ahyoung Yoo,&nbsp;Yeonhee Park,&nbsp;So Yeon Kim,&nbsp;Ye Rim Shin,&nbsp;Jung Dae Lim,&nbsp;Keun-Cheol Kim,&nbsp;Saeyoull Cho,&nbsp;Tae-Hyung Kwon","doi":"10.1016/j.jcou.2026.103612","DOIUrl":"10.1016/j.jcou.2026.103612","url":null,"abstract":"<div><div>Supercritical carbon dioxide (scCO₂) extraction has emerged as a promising green technology for extracting cannabinoids because it does not require any solvents and is environmentally friendly. However, the resulting scCO₂ crude extracts often contain high levels of co-extracted impurities, such as waxes and pigments, which hinder direct crystallization and necessitate efficient downstream purification. Cannabidiol (CBD) is a pharmacologically significant cannabinoid; however, achieving high-purity production sustainably remains challenging. This study presents a comprehensive and eco-friendly biorefinery framework for CBD purification that integrates scCO₂ extraction with optimized thin-film distillation (TFD) and crystallization. Crude oil from the 'Pink Pepper' hemp variety, extracted using scCO₂, was subjected to pretreatments followed by TFD optimization using response surface methodology (RSM) with a Box-Behnken design. Three independent variables, evaporation zone temperature, vacuum pressure, and feed rate were evaluated. The optimal TFD conditions were determined to be an evaporation temperature of 207.57 °C, a vacuum pressure of 0.050 mbar, and a feed rate of 37.47 Hz, achieving a CBD conversion rate of 68.05%. Under these conditions, CBD purity was significantly enhanced from 41.56% in the scCO₂ crude oil to 72.89% in the distillate, providing a refined feedstock for subsequent processing. High-purity CBD crystals (&gt;99.0%) were successfully obtained through solvent-minimal crystallization using pentane at −10 °C. This integrated scCO₂-TFD approach offers a robust and sustainable industrial paradigm for high-purity CBD production, significantly reducing reliance on organic solvents and highlighting the effectiveness of CO₂-based processing in the cannabinoid industry.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"113 ","pages":"Article 103612"},"PeriodicalIF":8.6,"publicationDate":"2026-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149364202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Integrating Spirulina cultivation as a bioregeneration step in a closed loop CO2 absorption process: Experimental validation","authors":"Danilo Marchese,&nbsp;Elena Barbera,&nbsp;Eleonora Sforza","doi":"10.1016/j.jcou.2026.103600","DOIUrl":"10.1016/j.jcou.2026.103600","url":null,"abstract":"<div><div>The integration of microalgal cultivation with CO₂ capture via chemical scrubbing can improve carbon utilization efficiency while reducing operational costs. However, the reciprocal effects between absorption and cultivation units need further investigation. This study evaluated the integration of carbonate-based CO₂ capture with cultivation of the alkaliphilic cyanobacterium <em>Spirulina</em> sp. in a Bicarbonate-based Carbon Capture and Algae Production System (BICCAPS). The effects of bicarbonate concentration, air sparging, medium recycling and absorption promoters were investigated experimentally, and the absorption step was assessed through Aspen Plus simulations. Air sparging removal did not significantly affect biomass concentration. Increasing sodium bicarbonate to 0.54 mol L⁻¹ maximized steady-state biomass concentration, whereas 0.72 mol L⁻¹ inhibited growth. Complete medium recycling progressively reduced biomass productivity, likely due to exopolysaccharide (EPS) accumulation, although CO₂ absorption kinetics were not significantly affected. In continuous operation, 85% medium recovery sustained biomass concentrations comparable to the no-recycle control, but reduced phycobiliprotein content; conversely, 90% recovery promoted excessive EPS accumulation and culture instability. Boric acid and triethanolamine negatively affected growth, although partial adaptation to prolonged exposure was observed. Absorption simulations indicated that increasing K₂CO₃ concentration from 1.5 to 4 wt%, while producing inorganic carbon levels compatible with cyanobacterial growth, reduced both absorber diameter and solvent flow rate relative to the reference condition. Overall, these results support the potential of bicarbonate-based microalgal cultivation in integrated carbon capture processes and identify bicarbonate tolerance, EPS accumulation, medium recycling and promoter toxicity as key parameters for BICCAPS optimization.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"113 ","pages":"Article 103600"},"PeriodicalIF":8.6,"publicationDate":"2026-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149363751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Simultaneous generation of hydrogen and carbon monoxide using a wet-type plasma reactor","authors":"Haruhiko Yamasaki,&nbsp;Ren Ushida,&nbsp;Tota Hiranaka,&nbsp;Junyang Wei,&nbsp;Tomoyuki Kuroki,&nbsp;Shiori Hori,&nbsp;Hashira Yamamoto,&nbsp;Masaaki Okubo","doi":"10.1016/j.jcou.2026.103604","DOIUrl":"10.1016/j.jcou.2026.103604","url":null,"abstract":"<div><div>Nonthermal plasma enables the conversion of carbon dioxide (CO₂) into carbon monoxide (CO), which can be used as a reducing agent or synthesis gas fuel. Additionally, wet-type plasma reactors can produce hydrogen (H₂) from liquid water (H₂O). The objective of this study is to use a wet-type plasma reactor to simultaneously generate H₂ and CO from liquid water and CO₂. The effects of water flow rate, α-alumina pellets packing, discharge wire diameter, and discharge frequency on product generation are evaluated. The maximum average H₂ and CO concentrations are 632 and 750 ppm, respectively, in the wet-type packed-bed plasma reactor at a water flow rate of 50 mL/min, discharge wire diameter of 2 mm, and pulsed frequency of 420 Hz, whereas the wet-type plasma reactor without pellet packing achieves concentrations of 2221 and 2086 ppm, respectively, at the same water flow rate with a wire diameter of 10 mm and pulsed frequency of 840 Hz. These results suggest that a wet-type plasma reactor without pellet packing is more favorable for the simultaneous production of H₂ and CO, as it promotes efficient electron-induced dissociation of H₂O and CO₂ while suppressing •OH-related secondary reactions. This reactor demonstrates an H₂ generation performance equivalent to or better than that of conventional humidified gas-phase plasma systems in the simultaneous generation of H₂ and CO. These results indicate that the direct interaction of plasma with liquid water is effective for the simultaneous generation of H₂ and CO from CO₂ and water.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"113 ","pages":"Article 103604"},"PeriodicalIF":8.6,"publicationDate":"2026-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149363784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Elucidating factors on carbonation behaviour of hardened cement fines in dripping technique","authors":"Dayoung Oh,&nbsp;Ryoma Kitagaki,&nbsp;Yaming Jin,&nbsp;Zhiwei Zhao","doi":"10.1016/j.jcou.2026.103602","DOIUrl":"10.1016/j.jcou.2026.103602","url":null,"abstract":"<div><div>This study investigates the carbonation behavior of hardened cement fines (HCF) using a dripping technique, a low-energy acceleration method designed to boost the carbonation of waste concrete under atmospheric CO₂ concentrations. The dripping technique subjects HCF to periodic water supply followed by drying phases, creating wet-dry cycle conditions that promote dissolution of calcium-bearing hydrates and advective ion transport. In this study, HCF with water-to-cement (w/c) ratios of 0.5 and 0.6 were exposed to wet–dry cycles at 40%, 60%, and 85% relative humidity (RH) and compared with conventional semi-dry carbonation at 60% RH. The results demonstrate that the dripping technique significantly improves carbonation efficiency, particularly at 40% RH with a 24-hour dripping interval, where the degree of carbonation (DoC) exceeded 60% within 28 days, compared to approximately 45% for the semi-dry 60% RH control. Low RH environment established a capillary pump mechanism via an evaporation-induced wicking effect, which promoted internal carbonation by continuously drawing ions to the surface. In contrast, high RH conditions promoted the formation of a thick, dense CaCO₃ surface layer, leading to reaction stagnation. Kinetic analysis using the Johnson-Mehl-Avrami-Kolmogorov (JMAK) model revealed that the dripping process at 40% RH shifts the reaction from diffusion-controlled to phase-boundary-controlled kinetics, effectively neutralizing transport resistance. The dripping solution promoted dissolution–reprecipitation into stable calcite and generated microcracking and pore coarsening, preserving a porous interior. These findings provide a mechanistic basis for adopting low-energy, dripping-based carbonation as a practical industrial method for recycling concrete fines.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"113 ","pages":"Article 103602"},"PeriodicalIF":8.6,"publicationDate":"2026-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149363750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Water-free dyeing of polypropylene fabrics in supercritical CO2 with functional dispersants for eco-friendly textile applications","authors":"Tz-An Ou,&nbsp;Jia-Wun Li,&nbsp;Cheng-Chieh Chang,&nbsp;Pei-Yi Yeh,&nbsp;Kuo-Chan Chiou,&nbsp;Tzong-Ming Lee,&nbsp;Shang-Ming Lin,&nbsp;Chih-Wei Chiu","doi":"10.1016/j.jcou.2026.103610","DOIUrl":"10.1016/j.jcou.2026.103610","url":null,"abstract":"<div><div>Owing to rising environmental awareness, the textile dyeing and finishing industry faces increasing pressure to reduce water consumption and chemical wastewater generation of conventional aqueous dyeing processes. Supercritical carbon dioxide (scCO₂) dyeing, a water-free dyeing method, conserves water resources and prevents water pollution. Polypropylene (PP) fabrics are promising eco-friendly textile materials owing to their simple structure, low carbon emissions, and less weight. High crystallinity and lack of polar functional groups in their molecular structure makes them difficult to dye. PP fibers are commonly colored via mass pigmentation. However, limited flexibility in masterbatch formulations restricts color mixing and shade modification. In this study, a series of styrene–maleic anhydride (SMA) copolymers grafted with long-chain alkyl amines were synthesized and used as dispersing agents in scCO₂ dyeing systems to enhance the disperse dye uptake of PP fibers. When applied to a disperse yellow dye (JY) and blue dye (JB), the SMA dispersants significantly improved dyeing performance under scCO₂ conditions. For a JY with an SMA dispersant, the Kubelka–Munk function (K/S) value increased by approximately 27.7%, whereas levelness (ΔE*) decreased by 47.1%. For a JB with an SMA dispersant, the K/S value increased by 39.7%, and ΔE* decreased by 42.6%. In a mixed-dye system, the SMA dispersant addition resulted in a 39.5% increase in K/S and 20.5% reduction in ΔE*. This study demonstrates the feasibility of using SMA–alkylamine polymeric dispersants to improve the dyeing performance and surface hydrophobicity of PP fabrics under water-free scCO₂ dyeing conditions without the use of fluorinated additives.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"113 ","pages":"Article 103610"},"PeriodicalIF":8.6,"publicationDate":"2026-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149364204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Temperature-dependent differences in CO2 foaming behavior between crude oil and its water-in-oil emulsion","authors":"Guangyu Sun,&nbsp;Fujun Sheng,&nbsp;Fei Yang,&nbsp;Bo Yao","doi":"10.1016/j.jcou.2026.103608","DOIUrl":"10.1016/j.jcou.2026.103608","url":null,"abstract":"<div><div>Emulsification and foaming frequently occur during crude oil production, transportation and separation. However, the mechanisms underlying the temperature-dependent differences in foaming behavior between crude oil and its emulsion remain insufficiently understood. This study examines these differences through measurements of viscosity-temperature behavior, wax precipitation, net CO₂ release, interfacial tension, interfacial dilational modulus, and foam drainage. Temperature markedly affects the foaming behavior of both fluids. At temperatures of 30 °C and below, the emulsion exhibits greater foamability than crude oil, whereas the difference is small at 35 °C and above. This behavior is associated with the coupled effects of bulk rheology and interfacial properties. Below the wax appearance temperature, dispersed droplets and networks of precipitated wax crystals increase the apparent viscosity of the emulsion. The oil-gas interface in the emulsion exhibits lower viscoelasticity than that in crude oil, which may be associated with the adsorption of surface-active components at oil-water interfaces. Higher viscosity favors foam persistence, whereas the lower interfacial dilational modulus may counteract this effect. The lower CO₂-liquid interfacial tension of the emulsion also favors bubble formation. In contrast, its lower net CO₂ release does not explain its greater foamability. The observed differences are therefore interpreted in terms of the combined effects of viscosity, interfacial tension, and net CO₂ release. These findings provide insight into the combined contributions of bulk rheology, interfacial properties, and CO₂ release dynamics, with implications for foam control, oil-gas separation, and flow assurance.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"113 ","pages":"Article 103608"},"PeriodicalIF":8.6,"publicationDate":"2026-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149363748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}