Journal of CO2 Utilization最新文献

英文中文

A co-feeding strategy of formate and H2 for methanogens – Enhancing growth parameters and methane production

IF 7.2 2区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization

Pub Date : 2025-03-01 DOI: 10.1016/j.jcou.2025.103049

Björn Sabel-Becker , Nicolas Patrick Jost , Anne-Kristin Kaster , Dirk Holtmann

Carbon dioxide emissions could be reduced by developing alternative production processes based on a renewable C1 building block. Formate could link the electrical and chemical sectors as its production can be realized through the electrochemical reduction of CO₂. Its function could be either a long-term energy storage medium or a starting material in a bioprocess. In this study, formate served as an energy and carbon source for methane production with a formatotrophic mixed culture. It was successfully shown that the theoretical maximum of 0.25 methane per formate can be overcome by co-feeding formate with H₂. The production yield doubled to 0.555 ± 0.021 in a CO₂-free buffer and 0.591 ± 0.032 in a bicarbonate buffer. With excess CO₂ in the bicarbonate buffered culture, it was shown that the H₂ transfer rate was the limiting factor for this process. Otherwise, the bicarbonate buffered culture outperformed other buffered cultures in terms of start-up time, formate consumption, and methane production rate. The additional CO₂ in the gas phase might have enhanced the growth of methanogens in an early stage of cultivation. 16S sequencing revealed the composition of the cultures. With nearly 25 %, the genus Methanofollis was one of the most dominant strains and the only detectable methanogen in the mixed culture, making it an interesting candidate for formatotrophic methane production. In summary, the co-feeding strategy might be an approach to utilizing formate as feedstock for the bioproduction of methane if hurdles like the H₂ transfer rates can be overcome.

{"title":"A co-feeding strategy of formate and H2 for methanogens – Enhancing growth parameters and methane production","authors":"Björn Sabel-Becker , Nicolas Patrick Jost , Anne-Kristin Kaster , Dirk Holtmann","doi":"10.1016/j.jcou.2025.103049","DOIUrl":"10.1016/j.jcou.2025.103049","url":null,"abstract":"<div><div>Carbon dioxide emissions could be reduced by developing alternative production processes based on a renewable C1 building block. Formate could link the electrical and chemical sectors as its production can be realized through the electrochemical reduction of CO<sub>2</sub>. Its function could be either a long-term energy storage medium or a starting material in a bioprocess. In this study, formate served as an energy and carbon source for methane production with a formatotrophic mixed culture. It was successfully shown that the theoretical maximum of 0.25 methane per formate can be overcome by co-feeding formate with H<sub>2</sub>. The production yield doubled to 0.555 ± 0.021 in a CO<sub>2</sub>-free buffer and 0.591 ± 0.032 in a bicarbonate buffer. With excess CO<sub>2</sub> in the bicarbonate buffered culture, it was shown that the H<sub>2</sub> transfer rate was the limiting factor for this process. Otherwise, the bicarbonate buffered culture outperformed other buffered cultures in terms of start-up time, formate consumption, and methane production rate. The additional CO<sub>2</sub> in the gas phase might have enhanced the growth of methanogens in an early stage of cultivation. 16S sequencing revealed the composition of the cultures. With nearly 25 %, the genus <em>Methanofollis</em> was one of the most dominant strains and the only detectable methanogen in the mixed culture, making it an interesting candidate for formatotrophic methane production. In summary, the co-feeding strategy might be an approach to utilizing formate as feedstock for the bioproduction of methane if hurdles like the H<sub>2</sub> transfer rates can be overcome.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"93 ","pages":"Article 103049"},"PeriodicalIF":7.2,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143547858","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}

引用次数: 0

Black-box and white-box machine learning tools to estimate the frost formation condition during cryogenic CO2 capture from natural gas blends

IF 7.2 2区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization

Pub Date : 2025-02-26 DOI: 10.1016/j.jcou.2025.103052

Farag M.A. Altalbawy , Fadhel F. Sead , Dharmesh Sur , Anupam Yadav , José Gerardo León Chimbolema , Suhas Ballal , Abhayveer Singh , Anita Devi , Kamal Kant Joshi , Nizomiddin Juraev , Hossein Mahabadi Asl

Cryogenic carbon capture (CCC), a promising technology for the sequestration of CO₂ from natural gas streams, relies on the CO₂ frost formation at cryogenic temperatures. Precise estimation of the CO₂ frost formation temperature (FFT) is vital for optimizing CCC processes and maximizing efficiency. This study deals with the development of machine learning models for predicting the FFT of CO₂ in natural gas blends. A comprehensive dataset, including 430 experimental samples, was assembled from the literature. The foregoing dataset included the FFT data for binary and ternary natural gas blends across a wide range of pressures and component fractions. Three distinct black-box algorithms, including Regression Tree (RT), Radial Basis Function Neural Network (RBF-NN) and Support Vector Machine (SVM) were employed to model FFT. The performance of each model was rigorously explored through diverse statistical and graphical methods. While all developed models demonstrated high accuracy, the RBF-NN model was the superior predictive tool, achieving a mean absolute percentage error (MAPE) of 0.82 % and a standard deviation (SD) of 1.19 % during the validation phase. Also, an explicit correlation for FFT was proposed using the white-box machine learning technique of Gene Expression Programming (GEP), which achieved the MAPE of 0.59 % for all data. The models were also capable of predicting the FFT of CO₂ in both binary and ternary blends, and favorably captured the complicated physical variations of FFT under diverse operating conditions. To gain deeper insights into the most fundamental factors in controlling the FFT of CO₂, a sensitivity analysis was conducted. The findings of the current study, in turn, contribute to the understanding of FFT of CO₂ and the optimal design of the CCC processes in natural gas industries.

{"title":"Black-box and white-box machine learning tools to estimate the frost formation condition during cryogenic CO2 capture from natural gas blends","authors":"Farag M.A. Altalbawy , Fadhel F. Sead , Dharmesh Sur , Anupam Yadav , José Gerardo León Chimbolema , Suhas Ballal , Abhayveer Singh , Anita Devi , Kamal Kant Joshi , Nizomiddin Juraev , Hossein Mahabadi Asl","doi":"10.1016/j.jcou.2025.103052","DOIUrl":"10.1016/j.jcou.2025.103052","url":null,"abstract":"<div><div>Cryogenic carbon capture (CCC), a promising technology for the sequestration of CO<sub>2</sub> from natural gas streams, relies on the CO<sub>2</sub> frost formation at cryogenic temperatures. Precise estimation of the CO<sub>2</sub> frost formation temperature (FFT) is vital for optimizing CCC processes and maximizing efficiency. This study deals with the development of machine learning models for predicting the FFT of CO<sub>2</sub> in natural gas blends. A comprehensive dataset, including 430 experimental samples, was assembled from the literature. The foregoing dataset included the FFT data for binary and ternary natural gas blends across a wide range of pressures and component fractions. Three distinct black-box algorithms, including Regression Tree (RT), Radial Basis Function Neural Network (RBF-NN) and Support Vector Machine (SVM) were employed to model FFT. The performance of each model was rigorously explored through diverse statistical and graphical methods. While all developed models demonstrated high accuracy, the RBF-NN model was the superior predictive tool, achieving a mean absolute percentage error (MAPE) of 0.82 % and a standard deviation (SD) of 1.19 % during the validation phase. Also, an explicit correlation for FFT was proposed using the white-box machine learning technique of Gene Expression Programming (GEP), which achieved the MAPE of 0.59 % for all data. The models were also capable of predicting the FFT of CO<sub>2</sub> in both binary and ternary blends, and favorably captured the complicated physical variations of FFT under diverse operating conditions. To gain deeper insights into the most fundamental factors in controlling the FFT of CO<sub>2</sub>, a sensitivity analysis was conducted. The findings of the current study, in turn, contribute to the understanding of FFT of CO<sub>2</sub> and the optimal design of the CCC processes in natural gas industries.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"93 ","pages":"Article 103052"},"PeriodicalIF":7.2,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143487046","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}

引用次数: 0

Direct biogas methanation at moderate pressure: Mechanism investigation over Ni-based catalysts

IF 7.2 2区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization

Pub Date : 2025-02-25 DOI: 10.1016/j.jcou.2025.103045

Ilenia Giarnieri , Sining Chen , Daniel Ballesteros-Plata , Juan P. Holgado , Francesco Maluta , Alfonso Caballero , Francesca Ospitali , Enrique Rodríguez-Castellón , Giuseppe Fornasari , Andrew M. Beale , Patricia Benito

Direct upgrading of biogas by CO₂ methanation aims to produce a gas to be injected into the grid. Operating at moderate pressures favors thermodynamics, but catalyst surface and reaction mechanism under realistic conditions are not well investigated. We study the role of basic and metallic sites on performance and mechanism of clean biogas methanation (CO₂/CH₄=1/1 v/v) at 1, 5 and 7 bar. Ni/Mg/La/Al hydrotalcite-derived catalysts, with different Ni and La contents, are investigated combining tests and physico-chemical characterization, including quasi-in situ XPS at 7 bar, with CO₂-adsorption and methanation DRIFTS at 1 and 7 bar, respectively. An optimized catalyst (6.5 wt% La, 35 wt% Ni) with 3–4 nm Ni⁰ and balanced basicity, achieves 96 L_CH4*gcat⁻¹* h⁻¹ (300°C, 7 bar). DRIFTS confirm catalysts activity experimental trend. Optimizing Ni and La results in higher consumption rates of formate intermediate and sufficient Ni⁰ sites for CO formation. Increasing pressure to 7 bar promotes CO and m-HCOO reactivity.

{"title":"Direct biogas methanation at moderate pressure: Mechanism investigation over Ni-based catalysts","authors":"Ilenia Giarnieri , Sining Chen , Daniel Ballesteros-Plata , Juan P. Holgado , Francesco Maluta , Alfonso Caballero , Francesca Ospitali , Enrique Rodríguez-Castellón , Giuseppe Fornasari , Andrew M. Beale , Patricia Benito","doi":"10.1016/j.jcou.2025.103045","DOIUrl":"10.1016/j.jcou.2025.103045","url":null,"abstract":"<div><div>Direct upgrading of biogas by CO<sub>2</sub> methanation aims to produce a gas to be injected into the grid. Operating at moderate pressures favors thermodynamics, but catalyst surface and reaction mechanism under realistic conditions are not well investigated. We study the role of basic and metallic sites on performance and mechanism of clean biogas methanation (CO<sub>2</sub>/CH<sub>4</sub>=1/1 v/v) at 1, 5 and 7 bar. Ni/Mg/La/Al hydrotalcite-derived catalysts, with different Ni and La contents, are investigated combining tests and physico-chemical characterization, including <em>quasi-in situ</em> XPS at 7 bar, with CO<sub>2</sub>-adsorption and methanation DRIFTS at 1 and 7 bar, respectively. An optimized catalyst (6.5 wt% La, 35 wt% Ni) with 3–4 nm Ni<sup>0</sup> and balanced basicity, achieves 96 L<sub>CH4</sub>*gcat<sup>−1</sup>* h<sup>−1</sup> (300°C, 7 bar). DRIFTS confirm catalysts activity experimental trend. Optimizing Ni and La results in higher consumption rates of formate intermediate and sufficient Ni<sup>0</sup> sites for CO formation. Increasing pressure to 7 bar promotes CO and m-HCOO reactivity.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"93 ","pages":"Article 103045"},"PeriodicalIF":7.2,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143487044","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}

引用次数: 0

Effect of light-burned MgO on the microstructure and electrochemical corrosion behavior of carbonatable protective coatings

IF 7.2 2区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization

Pub Date : 2025-02-24 DOI: 10.1016/j.jcou.2025.103047

Zhaohua Xia , Chenxi Liu , Zhichao Liu , Fazhou Wang , Yunpeng Liu , Shuguang Hu

A novel γ-C₂S-MgO-based coatings were developed for steel protection by providing a carbonated layer on the surface of the steel. The effects of light-burned MgO on the coating's microstructure and electrochemical corrosion behavior were analyzed through XRD, FTIR, SEM, and electrochemical tests. The results showed that the incorporation of MgO inhibited the nucleation and growth of calcite, improved the cementation ability of carbonization products, and optimized the pore structure of the coating. Compared to the γ-C₂S group, the addition of MgO provides a two-stage densifying effect: it reacts with water and carbonate dioxide to generate magnesium carbonates at the first stage; then the partial crystalline transformation of magnesium carbonate occurs during the immersion process, provoking coating secondary compaction in the late period. The corrosion current density of the coating without film-forming components soaked in 3.5 wt% NaCl solution for 21 days maintained below 0.001 μA∙cm⁻². The impedance value of the EIS test reaches 10⁶ Ω·cm².

{"title":"Effect of light-burned MgO on the microstructure and electrochemical corrosion behavior of carbonatable protective coatings","authors":"Zhaohua Xia , Chenxi Liu , Zhichao Liu , Fazhou Wang , Yunpeng Liu , Shuguang Hu","doi":"10.1016/j.jcou.2025.103047","DOIUrl":"10.1016/j.jcou.2025.103047","url":null,"abstract":"<div><div>A novel γ-C<sub>2</sub>S-MgO-based coatings were developed for steel protection by providing a carbonated layer on the surface of the steel. The effects of light-burned MgO on the coating's microstructure and electrochemical corrosion behavior were analyzed through XRD, FTIR, SEM, and electrochemical tests. The results showed that the incorporation of MgO inhibited the nucleation and growth of calcite, improved the cementation ability of carbonization products, and optimized the pore structure of the coating. Compared to the γ-C<sub>2</sub>S group, the addition of MgO provides a two-stage densifying effect: it reacts with water and carbonate dioxide to generate magnesium carbonates at the first stage; then the partial crystalline transformation of magnesium carbonate occurs during the immersion process, provoking coating secondary compaction in the late period. The corrosion current density of the coating without film-forming components soaked in 3.5 wt% NaCl solution for 21 days maintained below 0.001 μA∙cm<sup>−2</sup>. The impedance value of the EIS test reaches 10<sup>6</sup> Ω·cm<sup>2</sup>.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"93 ","pages":"Article 103047"},"PeriodicalIF":7.2,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479353","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}

引用次数: 0

Efficient utilization of high CO2 landfill-gas for syngas generation: Ultra-rich combustion pathways study in porous media reactor via CFD simulation

IF 7.2 2区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization

Pub Date : 2025-02-20 DOI: 10.1016/j.jcou.2025.103044

Mohammadreza Mohammadpour , Amirreza Mohammadpour , Mehdi Ashjaee , Ehsan Houshfar

The current investigation explores the possibility of extracting syngas from low-calorific value landfill-gas rich-combustion with pure O₂, which contains a considerable amount of CO₂ in its composition as an effective strategy in CO₂ utilization. The results illustrate that enhancement in mixture velocity leads to a notable increment in syngas energy conversion efficiency from 36.9 % to 44.14 %. Furthermore, it was observed that the maximum rate of H₂ production occurs at an equivalence ratio of 2.2, followed by a subsequent decrease until the end of the studied interval. At a mixture velocity of 25 cm/s, CH₄ and CO₂ conversion ratios reach a maximum of 89.02 % and 42.85 %, respectively, alongside the highest syngas production efficiency. Moreover, with an equivalence ratio of 1.6 and a fuel mixture containing 70 % CH₄, the highest achievable syngas composition was found to be 0.3277 for CO, 0.2841 for H₂, 0.0676 for CH₄, and 0.2534 for CO₂, indicating useful conditions for syngas production. Eventually, reaction pathways analyses revealed that the hydrogen abstraction reactions of hydrocarbon species by H radical which majorly progress through direct CH₄ to H₂ conversion route, and hydrocarbon recombination routes have a key role in H₂ production from landfill gas. Moreover, for landfill gas with high CO₂ content, direct CO₂ to the CO reduction route is determinative. Conversely, when the CH₄ content of landfill gas is high, hydrocarbon recombination followed by ketenyl radical formation and decomposition to CO is the primary pathway in different mixture equivalence ratios.

{"title":"Efficient utilization of high CO2 landfill-gas for syngas generation: Ultra-rich combustion pathways study in porous media reactor via CFD simulation","authors":"Mohammadreza Mohammadpour , Amirreza Mohammadpour , Mehdi Ashjaee , Ehsan Houshfar","doi":"10.1016/j.jcou.2025.103044","DOIUrl":"10.1016/j.jcou.2025.103044","url":null,"abstract":"<div><div>The current investigation explores the possibility of extracting syngas from low-calorific value landfill-gas rich-combustion with pure O<sub>2</sub>, which contains a considerable amount of CO<sub>2</sub> in its composition as an effective strategy in CO<sub>2</sub> utilization. The results illustrate that enhancement in mixture velocity leads to a notable increment in syngas energy conversion efficiency from 36.9 % to 44.14 %. Furthermore, it was observed that the maximum rate of H<sub>2</sub> production occurs at an equivalence ratio of 2.2, followed by a subsequent decrease until the end of the studied interval. At a mixture velocity of 25 cm/s, CH<sub>4</sub> and CO<sub>2</sub> conversion ratios reach a maximum of 89.02 % and 42.85 %, respectively, alongside the highest syngas production efficiency. Moreover, with an equivalence ratio of 1.6 and a fuel mixture containing 70 % CH<sub>4</sub>, the highest achievable syngas composition was found to be 0.3277 for CO, 0.2841 for H<sub>2</sub>, 0.0676 for CH<sub>4</sub>, and 0.2534 for CO<sub>2</sub>, indicating useful conditions for syngas production. Eventually, reaction pathways analyses revealed that the hydrogen abstraction reactions of hydrocarbon species by H radical which majorly progress through direct CH<sub>4</sub> to H<sub>2</sub> conversion route, and hydrocarbon recombination routes have a key role in H<sub>2</sub> production from landfill gas. Moreover, for landfill gas with high CO<sub>2</sub> content, direct CO<sub>2</sub> to the CO reduction route is determinative. Conversely, when the CH<sub>4</sub> content of landfill gas is high, hydrocarbon recombination followed by ketenyl radical formation and decomposition to CO is the primary pathway in different mixture equivalence ratios.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"93 ","pages":"Article 103044"},"PeriodicalIF":7.2,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143444807","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}

引用次数: 0

Preparation of municipal waste incineration fly ash artificial aggregate using CO₂ curing and its properties 利用 CO₂ 固化法制备城市垃圾焚烧飞灰人工骨料及其性能

IF 7.2 2区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization

Pub Date : 2025-02-15 DOI: 10.1016/j.jcou.2025.103042

Zhen Li , Zhiwen Wu , Qing Long , Wudi Feng , Shuhua Liu , Xianze Yuan

With the acceleration of urbanization and the continuous growth of population, the treatment of municipal solid waste incineration fly ash (MSWI-FA), a product of municipal solid waste incineration, has become an important issue. In this study, MSWI-FA, fly ash, and cement were used as raw materials to prepare artificial aggregates by CO₂ curing technology and to study their properties. The results showed that the best performance of aggregates was obtained under CO₂ curing conditions with a water-solid ratio of 0.26, a cement content of 30 %, and fly ash content of 15 %. The formulation of raw materials affects the strength of aggregates. The appropriate amount of cement and fly ash can improve the strength, while excessive cement and fly ash can hinder the absorption and fixation of carbon dioxide, affect the carbonation reaction and strengthening effect, and even lead to the deterioration of performance. The CO₂ curing increased the average compressive strength of the artificial aggregate at the age of 28 days by approximately 80 %, and reduced water absorption, and improved durability. The produced aggregates have good stabilization ability for heavy metals, and the leaching concentration is lower than the national standard, which can be used safely in the construction field. In this study, MSWI-FA waste was successfully converted into artificial aggregates for use in construction using CO₂ curing technology, achieving the dual goals of waste recycling and carbon sequestration.

{"title":"Preparation of municipal waste incineration fly ash artificial aggregate using CO₂ curing and its properties","authors":"Zhen Li , Zhiwen Wu , Qing Long , Wudi Feng , Shuhua Liu , Xianze Yuan","doi":"10.1016/j.jcou.2025.103042","DOIUrl":"10.1016/j.jcou.2025.103042","url":null,"abstract":"<div><div>With the acceleration of urbanization and the continuous growth of population, the treatment of municipal solid waste incineration fly ash (MSWI-FA), a product of municipal solid waste incineration, has become an important issue. In this study, MSWI-FA, fly ash, and cement were used as raw materials to prepare artificial aggregates by CO₂ curing technology and to study their properties. The results showed that the best performance of aggregates was obtained under CO₂ curing conditions with a water-solid ratio of 0.26, a cement content of 30 %, and fly ash content of 15 %. The formulation of raw materials affects the strength of aggregates. The appropriate amount of cement and fly ash can improve the strength, while excessive cement and fly ash can hinder the absorption and fixation of carbon dioxide, affect the carbonation reaction and strengthening effect, and even lead to the deterioration of performance. The CO₂ curing increased the average compressive strength of the artificial aggregate at the age of 28 days by approximately 80 %, and reduced water absorption, and improved durability. The produced aggregates have good stabilization ability for heavy metals, and the leaching concentration is lower than the national standard, which can be used safely in the construction field. In this study, MSWI-FA waste was successfully converted into artificial aggregates for use in construction using CO₂ curing technology, achieving the dual goals of waste recycling and carbon sequestration.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"93 ","pages":"Article 103042"},"PeriodicalIF":7.2,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422516","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}

引用次数: 0

Sirolimus solubility in supercritical carbon dioxide: Measurement and modeling

IF 7.2 2区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization

Pub Date : 2025-02-15 DOI: 10.1016/j.jcou.2025.103034

Zohra Laggoune , Yasmine Masmoudi , Seyed Ali Sajadian , Elisabeth Badens

The solubility of drugs in supercritical carbon dioxide is a key parameter in their processing. This study focuses on sirolimus, an immunosuppressive drug used in organ transplantation. Its solubility in supercritical carbon dioxide was measured using a static gravimetric method. Measurements were carried out at pressures ranging from 12.5 MPa to 25.0 MPa and temperatures from 313 K to 328 K. The findings revealed a molar fraction range of sirolimus between 1.20 × 10⁻⁶ and 2.73 × 10⁻⁶ and a direct solubility behavior in the investigated domain. The experimental data were correlated using several models. These included semi-empirical density-based models (Chrastil, Mendez-Santiago and Teja, Bartle et al., Kumar and Johnston, Sparks et al., and Sodeifian et al.), as well as equation of state-based models (Soave-Redlich-Kwong and Peng-Robinson). The results indicated that Sparks et al. and Soave-Redlich-Kwong showed the lowest average absolute relative deviation (AARD%) and the corrected correlation coefficient (R_adj) of 4.12 %, 0.978 and 05.18 %, 0.980 respectively.

{"title":"Sirolimus solubility in supercritical carbon dioxide: Measurement and modeling","authors":"Zohra Laggoune , Yasmine Masmoudi , Seyed Ali Sajadian , Elisabeth Badens","doi":"10.1016/j.jcou.2025.103034","DOIUrl":"10.1016/j.jcou.2025.103034","url":null,"abstract":"<div><div>The solubility of drugs in supercritical carbon dioxide is a key parameter in their processing. This study focuses on sirolimus, an immunosuppressive drug used in organ transplantation. Its solubility in supercritical carbon dioxide was measured using a static gravimetric method. Measurements were carried out at pressures ranging from 12.5 MPa to 25.0 MPa and temperatures from 313 K to 328 K. The findings revealed a molar fraction range of sirolimus between 1.20 × 10<sup>−6</sup> and 2.73 × 10<sup>−6</sup> and a direct solubility behavior in the investigated domain. The experimental data were correlated using several models. These included semi-empirical density-based models (Chrastil, Mendez-Santiago and Teja, Bartle <em>et al</em>., Kumar and Johnston, Sparks <em>et al</em>., and Sodeifian <em>et al</em>.), as well as equation of state-based models (Soave-Redlich-Kwong and Peng-Robinson). The results indicated that Sparks <em>et al</em>. and Soave-Redlich-Kwong showed the lowest average absolute relative deviation (AARD%) and the corrected correlation coefficient (R<sub>adj</sub>) of 4.12 %, 0.978 and 05.18 %, 0.980 respectively.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"93 ","pages":"Article 103034"},"PeriodicalIF":7.2,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422517","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}

引用次数: 0

Bioelectrocatalytic CO2 reduction to formate by Candida boidinii formate dehydrogenase overcoming NADH dependence with tailored amino-viologen redox polymers

IF 7.2 2区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization

Pub Date : 2025-02-13 DOI: 10.1016/j.jcou.2025.103041

Mihai-Cristian Fera , Kavita Jayakumar , Diego García Bueno , Jose M. Abad , Antonio L. De Lacey , Marcos Pita

CO₂ reduction to formate through enzymatic systems represents a sustainable pathway for carbon utilization but is often limited by the cost and irreversibility of cofactors like NADH. In this study, we introduce a novel biocathode integrating NAD-dependent formate dehydrogenase (cbFDH) and an amino-viologen redox polymer (NH₂Et-PVI) to act as a mediating artificial cofactor, enabling continuous formate production without re-supply of exogenous cofactors. This bioelectrode achieves a faradaic efficiency of 95.4 % and a 43-fold increase in formate yield over traditional NADH-dependent biocatalytic systems, which highlights the cbFDH/NH₂Et-PVI bioelectrode as a promising advancement for economically viable CO₂ conversion.

引用次数: 0

Biogas upgrading through CO2 methanation in a multiple-inlet fixed bed reactor: Simulated parametric analysis

IF 7.2 2区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization

Pub Date : 2025-02-12 DOI: 10.1016/j.jcou.2025.103038

P. Aragüés-Aldea, V.D. Mercader, P. Durán, E. Francés, J.Á. Peña, J. Herguido

A simulation of the catalytic CO₂ methanation reaction was carried out, evaluating the effect of reactants distributed feeding throughout the bed. The main operational parameters were studied in a multiple-inlet reactor to test their effect on conversions and, most importantly, on selectivities towards both CO and CH₄ as reaction products. The analyzed parameters were, firstly, the number of feeding points (N) and the dosage degree of reactants, followed by temperature (T), partial pressures of reactants (H₂:CO₂ ratios), and the composition of a sweetened biogas as feeding stream (CH₄:CO₂ ratios). It is confirmed that a distribution of biogas through several side inlets improves selectivities to the desired CH₄ product, over other feeding configurations. The effect of distributing reactants becomes intensified when the number of lateral feedings increases. This observation supports the experimental trends already proven in previous works. Regarding main operation parameters such as temperature and H₂:CO₂ molar ratio, the analysis confirmed that their influence on selectivities acts just as predicted at low conversions. However, when these conversions become higher the space velocity (WHSV) is the most important factor for selectivities. Finally, no significant changes in reaction performance were obtained when modifying the biogas CH₄:CO₂ ratio in the broad range of methane concentrations from 55 v% to 70 v%.

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引用次数: 0

Steel-polypropylene hybrid fiber high performance cement-based composites: Mechanical properties, microscopic mechanisms, and carbon emission evaluation

IF 7.2 2区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization

Pub Date : 2025-02-11 DOI: 10.1016/j.jcou.2025.103039

Weiguo Zhang , Xiang Lv , Jun Tian , Hongbo Liu , Xiaowei Wu , Shengwen Tang , Nengzhong Lei , Yulin Wang , Wentong Huang

To overcome the problems of steel fiber reinforced high performance cementitious composites (SF/HPCC), such as mixing difficulties, self-weight, high cost and high carbon emissions. The polypropylene fiber (PPF) was selected to substitute steel fiber (SF) in equal volume to explore the rule of PPF replacement rate on workability, compressive strength and split tensile strength of SF-PPF/HPCC, and the mechanism of the effect of the substitution ratio of PPF for SF on the mechanical properties of SF-PPF/HPCC was revealed. Finally, the carbon emission and economic analysis of SF-PPF/HPCC were evaluated. The results showed that PPF substitution of SF improves the workability of SF-PPF/HPCC, Compared to SP0, the SP10, SP15, SP20, SP30, and SP40 showed an increase of 4.34 %, 6.52 %, 10.87 %, 13.04 %, and 13.04 % in slump, and an increase of 1.25 %, 2.5 %, 5 %, 6.25 %, and 7.5 % in slump flow, respectively. For the mechanical properties, when the replacement of SF by PPF was 20 % (SP20), the compressive strength decreased by 6.54 % and the splitting tensile strength increased by 16.82 % compared with SP0. From the quantitative analysis of microscopic morphology and microscopic parameters, the increase of the substitution rate of PPF weakened the cutting effect of SF, so that the particles tended to be elongated and the pore size increased. However, the reasonable blending of PPF and SF can make the size of particle and pore tend to be fine and improve the macroscopic properties of SF-PPF/HPCC. Replacing SF with PPF can reduce CO₂ emission, lower the social cost of CO₂ emission, and lower the production cost of SF-PPF/HPCC, which was an effective strategy to achieve low-carbon and low-cost production, and was of great significance to promote its application in the engineering field.

{"title":"Steel-polypropylene hybrid fiber high performance cement-based composites: Mechanical properties, microscopic mechanisms, and carbon emission evaluation","authors":"Weiguo Zhang , Xiang Lv , Jun Tian , Hongbo Liu , Xiaowei Wu , Shengwen Tang , Nengzhong Lei , Yulin Wang , Wentong Huang","doi":"10.1016/j.jcou.2025.103039","DOIUrl":"10.1016/j.jcou.2025.103039","url":null,"abstract":"<div><div>To overcome the problems of steel fiber reinforced high performance cementitious composites (SF/HPCC), such as mixing difficulties, self-weight, high cost and high carbon emissions. The polypropylene fiber (PPF) was selected to substitute steel fiber (SF) in equal volume to explore the rule of PPF replacement rate on workability, compressive strength and split tensile strength of SF-PPF/HPCC, and the mechanism of the effect of the substitution ratio of PPF for SF on the mechanical properties of SF-PPF/HPCC was revealed. Finally, the carbon emission and economic analysis of SF-PPF/HPCC were evaluated. The results showed that PPF substitution of SF improves the workability of SF-PPF/HPCC, Compared to SP0, the SP10, SP15, SP20, SP30, and SP40 showed an increase of 4.34 %, 6.52 %, 10.87 %, 13.04 %, and 13.04 % in slump, and an increase of 1.25 %, 2.5 %, 5 %, 6.25 %, and 7.5 % in slump flow, respectively. For the mechanical properties, when the replacement of SF by PPF was 20 % (SP20), the compressive strength decreased by 6.54 % and the splitting tensile strength increased by 16.82 % compared with SP0. From the quantitative analysis of microscopic morphology and microscopic parameters, the increase of the substitution rate of PPF weakened the cutting effect of SF, so that the particles tended to be elongated and the pore size increased. However, the reasonable blending of PPF and SF can make the size of particle and pore tend to be fine and improve the macroscopic properties of SF-PPF/HPCC. Replacing SF with PPF can reduce CO<sub>2</sub> emission, lower the social cost of CO<sub>2</sub> emission, and lower the production cost of SF-PPF/HPCC, which was an effective strategy to achieve low-carbon and low-cost production, and was of great significance to promote its application in the engineering field.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"93 ","pages":"Article 103039"},"PeriodicalIF":7.2,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143378125","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}

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