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Graphite–Ni synergy unlocks a hydrogen-free pathway for carbon based integrated CO₂ capture and utilisation (ICCU) 石墨-镍协同作用为碳基集成二氧化碳捕获和利用(ICCU)开辟了无氢途径
Pub Date : 2025-12-01 DOI: 10.1016/j.ccst.2025.100546
Junhan Lu, Xiaotong Zhao, Jia Hu, Bo Zong, Yuanyuan Wang, Chunfei Wu
Integrated carbon capture and utilisation (ICCU) is a promising technology to mitigate the impact of carbon emissions, as it combines sorbent regeneration and CO2 utilisation. ICCU has been intensively studied for reverse water shift reaction (RWGS), methanation and dry methane reforming (DRM). However, ICCU-RWGS and ICCU-Methanation rely on hydrogen, which compromises economic viability and safety, and the complex synthesis of DFMs for ICCU-DRM, requiring promoters or multilayer structures. To enhance the practicality of ICCU technology, here we investigated carbon-based ICCU (C-ICCU), which utilises the reverse Boudouard reaction with carbon as the reducing agent. In this study, we explored the key operational factors influencing C-ICCU performance, specifically Ni loading, the Ni/graphite mass, and temperature. Our findings indicate that Ni/graphite is a highly effective catalyst for the in-situ conversion of CO2 to CO. Specifically, a Ni loading of 3 wt.% or higher achieved a CO2 conversion greater than 95% at 650°C. Furthermore, in-situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) analysis revealed the synergistic interactions between graphite and nickel. Specifically, graphite promotes CO2 generation while nickel catalyses its subsequent conversion. Our research demonstrates that the C-ICCU mechanism is a complex synergistic process involving the dynamic evolution of surface species. This work offers a promising, safer, and potentially more economical pathway for industrial carbon capture and utilisation.
综合碳捕获与利用(ICCU)是一种很有前途的技术,可以减轻碳排放的影响,因为它结合了吸附剂再生和二氧化碳利用。ICCU在逆水变换反应(RWGS)、甲烷化和干甲烷重整(DRM)中得到了广泛的研究。然而,ICCU-RWGS和iccu -甲烷化依赖于氢,这损害了经济可行性和安全性,并且ICCU-DRM的dms合成复杂,需要启动子或多层结构。为了提高ICCU技术的实用性,我们研究了碳基ICCU (C-ICCU),它利用碳作为还原剂进行反向Boudouard反应。在这项研究中,我们探讨了影响C-ICCU性能的关键操作因素,特别是Ni负载,Ni/石墨质量和温度。我们的研究结果表明,Ni/石墨是一种非常有效的催化剂,可以将CO2原位转化为CO。具体来说,在650°C下,3 wt.%或更高的Ni负载可以实现95%以上的CO2转化率。此外,原位漫反射红外傅立叶变换光谱(DRIFTS)分析揭示了石墨和镍之间的协同作用。具体来说,石墨促进二氧化碳的产生,而镍则催化其随后的转化。我们的研究表明,C-ICCU机制是一个复杂的协同过程,涉及地表物种的动态进化。这项工作为工业碳捕获和利用提供了一条有前途、更安全、潜在更经济的途径。
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引用次数: 0
Advanced soil carbonation strategies: insights into quantification, performance, and scalable carbon capture 先进的土壤碳化策略:对量化,性能和可扩展的碳捕获的见解
Pub Date : 2025-12-01 DOI: 10.1016/j.ccst.2025.100551
Aaqib Ali , Arshad Raza , Mubashir Aziz , Mohamed Mahmoud , Umair Ali , Ammar Mohammed Alshammari
Accelerated soil carbonation (ASC) is a rapidly advancing carbon capture and storage technique which provides a dual benefit of permanent CO2 sequestration and geotechnical soil stabilization. This paper presents a comprehensive review of soil carbonation processes, emphasizing the mechanisms, quantification methods, and engineering performance improvements achieved through MgO and CaO-based binders and industrial by-products. The carbonation process transforms reactive oxides into stable carbonate minerals, enhancing soil strength, stiffness, and durability while reducing moisture content and porosity. A systematic analysis of the impact of carbonation on physical, chemical, mechanical, and microstructural behavior is presented, together with quantification approaches such as thermogravimetric analysis, calcimetry, and gas-balance techniques. The techno-economic evaluation highlights that optimized magnesia-lime-slag systems can offset up to 70 % of embodied emissions, offering a cost-effective and scalable pathway for carbon-negative ground improvement. Despite these advances, the field faces challenges related to reaction uniformity, long-term durability, and standardization of quantification and field protocols. The study identifies key research directions to establish ASC as a reliable, sustainable, and verifiable carbon sequestration strategy in geotechnical engineering.
加速土壤碳化(ASC)是一项快速发展的碳捕获和储存技术,它提供了永久二氧化碳封存和岩土土壤稳定的双重好处。本文对土壤碳酸化过程进行了全面的综述,重点介绍了MgO和cao基粘结剂以及工业副产品对土壤碳酸化过程的机理、量化方法和工程性能的改善。碳化过程将活性氧化物转化为稳定的碳酸盐矿物,增强土壤的强度、刚度和耐久性,同时减少水分含量和孔隙率。系统地分析了碳化对物理、化学、机械和微观结构行为的影响,并结合了热重分析、钙量测定和气体平衡技术等量化方法。技术经济评估强调,优化的镁-石灰-渣系统可以抵消高达70%的实际排放,为碳负的土地改善提供了一种具有成本效益和可扩展的途径。尽管取得了这些进步,但该领域仍面临着与反应均匀性、长期耐久性以及量化和现场协议标准化相关的挑战。研究确定了在岩土工程中建立可靠、可持续、可验证的ASC固碳策略的重点研究方向。
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引用次数: 0
Volatile nitrosamine manual stack monitoring method: sampling validation and performance assessment on stack simulated conditions 挥发性亚硝胺人工堆监测方法:堆模拟条件下的抽样验证与性能评估
Pub Date : 2025-12-01 DOI: 10.1016/j.ccst.2025.100539
Haydn Barros, Richard Harvey, Hannah Cheales-Norman, Chris Dimopoulos, Rod Robinson
Degradation products of sorbent amines used in Post Combustion CO2 Capture (PCC) (amines, nitrosamines, etc.) are potentially emitted to the atmosphere, impacting health and the environment. This paper proposes and validates for the first time a manual stack sampling method for monitoring nitrosamine emissions, using a purpose-built test bench and simulating nitrosamine sampling through monitoring tests under controlled conditions mimicking those of a PCC plant. The method uses isokinetic sampling (due to the presence of water droplets in the PCC flue gas), a combination of liquid sampling (three impingers in series) and dry sampling cartridges. Collected samples were refrigerated and send to for laboratory analysis (using a Gas Chromatography - Thermal Energy Analyser). In terms of the recovered mass of the target analytes, the method was successfully validated for the five more volatile compounds (NDMA, NMEA, NDEA, NDPA, and NPIP), while the three less volatile nitrosamine’s (NDBA, NPYR, and NMOR) had recoveries of 75–80 %. However, based on the same experimental data but using the criterion of recovering in the last impinger <5 % of the total (for each species), only the linear nitrosamines with medium volatility failed, NDPA and NDBA, capturing 11 and 22 % respectively. As expected, these last two nitrosamines were also found in sizeable amounts in the back-end cartridge, demonstrating significant breakthrough from all the impingers. In spite of the general good recovery of the method for volatile nitrosamines, the results for some of the semi-volatile species show that is advisable to enhance the method to achieve a recovery closer to 100 % for all the nitrosamines. Two simple proposals to achieve that goal are discussed. The sampling recovery depends on the volatility and chemical structure of the specific nitrosamines. The conclusions presented here could be carefully extrapolated to other species with similar volatilities and structures, but not to low volatile nitrosamines which will require different sample media to be sampled, for that reason they are outside of the scope of this work.
燃烧后二氧化碳捕集(PCC)中使用的吸附胺的降解产物(胺、亚硝胺等)有可能排放到大气中,影响健康和环境。本文首次提出并验证了一种监测亚硝胺排放的人工堆样方法,利用专门搭建的试验台,通过模拟PCC工厂控制条件下的监测试验模拟亚硝胺采样。该方法使用等速采样(由于PCC烟气中存在水滴)、液体采样(串联三个撞击器)和干式采样筒的组合。收集的样品被冷藏并送到实验室分析(使用气相色谱-热能分析仪)。在目标分析物的回收率方面,该方法成功地验证了5种挥发性较高的化合物(NDMA、NMEA、NDEA、NDPA和NPIP),而3种挥发性较低的亚硝胺(NDBA、NPYR和NMOR)的回收率为75 - 80%。然而,基于相同的实验数据,但使用在最后一个冲击中恢复总数的5%(每个物种)的标准,只有中等挥发性的线性亚硝胺失败,NDPA和NDBA分别捕获11%和22%。正如预期的那样,后端枪弹中也发现了大量的这最后两种亚硝胺,这表明所有撞击物都取得了重大突破。尽管该方法对挥发性亚硝胺的回收率一般较好,但对某些半挥发性亚硝胺的结果表明,建议对该方法进行改进,使所有亚硝胺的回收率接近100%。本文讨论了实现这一目标的两个简单建议。采样回收率取决于特定亚硝胺的挥发性和化学结构。这里提出的结论可以谨慎地外推到具有类似挥发性和结构的其他物种,但不能外推到低挥发性亚硝胺,因为这需要不同的样品介质进行取样,因此它们不在本工作的范围之内。
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引用次数: 0
Integrating diabatic CAES with post-combustion capture to mitigate combustion emissions: case study and regional sensitivity 将绝热CAES与燃烧后捕获相结合以减少燃烧排放:案例研究和区域敏感性
Pub Date : 2025-12-01 DOI: 10.1016/j.ccst.2025.100543
Zhaoxi Dong , Yurong Liu , Feihu Ma , Honghai Ma , Xin Peng , Weimin Zhong , Feng Qian
Energy storage technology is essential for addressing the intermittency of renewable energy, particularly wind power. Diabatic compressed air energy storage (DCAES) technology is relatively mature, however, it suffers from the drawback of greenhouse gas (GHG) emissions caused by fuel combustion. In this study, an integrated system that combines post-combustion carbon capture (PCC) with DCAES is proposed to decrease GHG emissions without purchasing outsource steam. A case study over a typical 24-hour period shows that the integrated system can ensure the stability of the power output from wind power to the grid during peak electricity usage period. The integration of PCC reduces the power output of DCAES during the discharge phase by 23.6 %, while the levelized cost of electricity rises from 55.63 $/MWh to 88.77 $/MWh. Otherwise, PCC subsystem contributes 12.7 % of the whole exergy destruction of the integrated system. These indicates that the cost of the PCC integration is acceptable from the thermodynamic and economic standing. Whereas, when wind power is used as the charging source, PCC integration can reduce life cycle GHG emissions by 66.9 % of the output electricity and the effect of GHG emission reduction is affected by region. This work provides valuable insights into achieving low-carbon operation of DCAES systems.
储能技术对于解决可再生能源,特别是风能的间歇性问题至关重要。非绝热压缩空气储能(DCAES)技术相对成熟,但存在燃料燃烧产生温室气体排放的缺点。本研究提出了一种将燃烧后碳捕集(PCC)与DCAES相结合的综合系统,在不购买外包蒸汽的情况下减少温室气体排放。以典型的24小时时段为例进行了分析,结果表明,该集成系统能够保证风电在用电高峰时段向电网输出电力的稳定性。PCC的集成使DCAES在放电阶段的输出功率降低了23.6%,而电力平准化成本从55.63美元/兆瓦时上升到88.77美元/兆瓦时。另外,PCC分系统对整个系统的火用破坏贡献率为12.7%。这表明,从热力学和经济的角度来看,PCC集成的成本是可以接受的。而风电作为充电源时,PCC集成可使全生命周期温室气体排放量减少66.9%,且温室气体减排效果受区域影响。这项工作为实现DCAES系统的低碳运行提供了有价值的见解。
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引用次数: 0
Prediction of CO2 capture performance of a direct air capture unit under representative atmospheric flow conditions using large eddy simulation 用大涡模拟预测典型大气流动条件下直接空气捕集装置的CO2捕集性能
Pub Date : 2025-12-01 DOI: 10.1016/j.ccst.2025.100545
Esmaeel Eftekharian , Ali Kiani , Vassili Kitsios , Ashok K. Luhar , Paul Feron , Aaron W. Thornton , Kathryn M. Emmerson
The removal of carbon dioxide (CO2) from the atmosphere using direct air capture (DAC) is crucial in achieving the net-zero emissions target and combating global warming. We develop a new numerical model that predicts the performance of DAC units under representative atmospheric flow conditions which captures the interaction between these units and the instantaneous flow fields. A new boundary condition for the CO2 concentration associated with the CO2-depleted exit plume was developed. This boundary condition dynamically calculates the time-varying fraction of CO2 removed from the air (capture rate) and the total mass of CO2 captured by the system per unit time (capture amount). We have also conducted experiments in a lab-scale DAC unit at different inlet air velocities. The experiment showed that both the CO2 capture rate and the capture amount depend on the unit’s inlet airflow velocity. Specifically, the CO2 capture rate decreases with an increase in unit inlet airflow velocity, while the CO2 capture amount increases. These data were used to validate our computational fluid dynamics analysis using a large eddy simulation (LES) approach. After validating the new boundary condition model with experimental data in still air, the LES simulations were extended to include the interaction of atmospheric boundary layer wind with individual DAC units. The CO2 capture rate and capture amount are almost constant in still air, whilst they strongly fluctuate for wind speeds above 7 m/s. The amplitude of these fluctuations grows with increasing wind velocity. The LES results showed that when the wind velocity increased, both the CO2 capture rate and the overall mean CO2 capture amount of an individual DAC unit were reduced. In strong winds of 9 m/s, the total CO2 mass removal was reduced by up to 7.5 % ± 6.5 % over one year. The new boundary condition model can more accurately predict the overall CO2 capture characteristics of large-scale DAC plants in complex real environmental conditions.
利用直接空气捕获(DAC)从大气中去除二氧化碳(CO2)对于实现净零排放目标和应对全球变暖至关重要。我们开发了一个新的数值模型来预测DAC单元在典型大气流动条件下的性能,该模型捕捉了这些单元与瞬时流场之间的相互作用。提出了一个新的CO2浓度边界条件,该边界条件与CO2耗尽的出口羽流有关。该边界条件动态地计算从空气中去除的随时间变化的CO2分数(捕获率)和单位时间内系统捕获的CO2总质量(捕获量)。我们还在实验室规模的DAC单元中进行了不同进气速度的实验。实验表明,CO2的捕集速率和捕集量都取决于装置的入口气流速度。具体来说,CO2捕集率随着单位进口气流速度的增加而降低,而CO2捕集量则增加。这些数据用于验证我们使用大涡模拟(LES)方法进行的计算流体动力学分析。在用静止空气中的实验数据验证了新的边界条件模型后,扩展了LES模拟,以包括大气边界层风与各个DAC单元的相互作用。在静止的空气中,CO2的捕获速率和捕获量几乎是恒定的,而风速超过7米/秒时,它们的波动很大。这些波动的幅度随着风速的增大而增大。LES结果表明,随着风速的增加,DAC单元的CO2捕集率和总体平均CO2捕集量均降低。在9米/秒的强风中,二氧化碳的总去除率在一年内减少了7.5%±6.5%。新的边界条件模型可以更准确地预测复杂真实环境条件下大型DAC厂的整体CO2捕集特性。
{"title":"Prediction of CO2 capture performance of a direct air capture unit under representative atmospheric flow conditions using large eddy simulation","authors":"Esmaeel Eftekharian ,&nbsp;Ali Kiani ,&nbsp;Vassili Kitsios ,&nbsp;Ashok K. Luhar ,&nbsp;Paul Feron ,&nbsp;Aaron W. Thornton ,&nbsp;Kathryn M. Emmerson","doi":"10.1016/j.ccst.2025.100545","DOIUrl":"10.1016/j.ccst.2025.100545","url":null,"abstract":"<div><div>The removal of carbon dioxide (CO<sub>2</sub>) from the atmosphere using direct air capture (DAC) is crucial in achieving the net-zero emissions target and combating global warming. We develop a new numerical model that predicts the performance of DAC units under representative atmospheric flow conditions which captures the interaction between these units and the instantaneous flow fields. A new boundary condition for the CO<sub>2</sub> concentration associated with the CO<sub>2</sub>-depleted exit plume was developed. This boundary condition dynamically calculates the time-varying fraction of CO<sub>2</sub> removed from the air (capture rate) and the total mass of CO<sub>2</sub> captured by the system per unit time (capture amount). We have also conducted experiments in a lab-scale DAC unit at different inlet air velocities. The experiment showed that both the CO<sub>2</sub> capture rate and the capture amount depend on the unit’s inlet airflow velocity. Specifically, the CO<sub>2</sub> capture rate decreases with an increase in unit inlet airflow velocity, while the CO<sub>2</sub> capture amount increases. These data were used to validate our computational fluid dynamics analysis using a large eddy simulation (LES) approach. After validating the new boundary condition model with experimental data in still air, the LES simulations were extended to include the interaction of atmospheric boundary layer wind with individual DAC units. The CO<sub>2</sub> capture rate and capture amount are almost constant in still air, whilst they strongly fluctuate for wind speeds above 7 m/s. The amplitude of these fluctuations grows with increasing wind velocity. The LES results showed that when the wind velocity increased, both the CO<sub>2</sub> capture rate and the overall mean CO<sub>2</sub> capture amount of an individual DAC unit were reduced. In strong winds of 9 m/s, the total CO<sub>2</sub> mass removal was reduced by up to 7.5 % ± 6.5 % over one year. The new boundary condition model can more accurately predict the overall CO<sub>2</sub> capture characteristics of large-scale DAC plants in complex real environmental conditions.</div></div>","PeriodicalId":9387,"journal":{"name":"Carbon Capture Science & Technology","volume":"17 ","pages":"Article 100545"},"PeriodicalIF":0.0,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145614610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A comprehensive review on the conversion of CO2 into solid carbon materials 二氧化碳转化为固体碳材料的研究综述
Pub Date : 2025-11-28 DOI: 10.1016/j.ccst.2025.100547
Bentolhoda Chenarani, Ahad Ghaemi, Alireza Hemmati
The conversion of carbon dioxide (CO2) into valuable solid carbon materials presents a promising approach for carbon utilization and climate change mitigation. This review systematically evaluates six major carbon allotropes: graphene, carbon nanotubes (CNTs), carbon nanofibers (CNFs), fullerenes, diamonds, and porous carbon, with a focus on synthesis methods, operating conditions, and industrial feasibility. Among these, CNTs and CNFs show the highest potential, especially when produced via molten carbonate electrolysis or the Solar Thermal Electrochemical Process (STEP), which operate at approximately 750–770 °C and near-atmospheric pressure. These methods have demonstrated high carbon conversion efficiencies and significantly lower estimated production costs compared to conventional CVD techniques, due to their simpler operation and lower material costs. Graphene, although high in quality, requires approximately 1000 °C and expensive catalysts, making it less scalable. Fullerenes (C60) and diamonds have very low yields (<1 %) and require extreme pressures (up to 1000 atm), limiting their industrial use. Porous carbons, synthesized electrochemically or by metal/inorganic reduction at 500–850 °C, show promise for supercapacitors and adsorption, with yields up to 55.3 wt % and built-in doping capabilities. Metal-mediated methods using Mg, Zn, and NaBH4 offer simplicity, moderate conditions, and tunable structures, while new hybrid approaches provide synergistic benefits. Overall, molten salt electrochemical methods are highly promising candidates for scalable and energy-efficient processes, supporting CO2 valorization in sustainable carbon material production.
将二氧化碳(CO2)转化为有价值的固体碳材料是碳利用和减缓气候变化的一种有前途的方法。本文系统评价了六种主要的碳同素异形体:石墨烯、碳纳米管(CNTs)、碳纳米纤维(CNFs)、富勒烯、金刚石和多孔碳,重点介绍了合成方法、操作条件和工业可行性。其中,碳纳米管和CNFs表现出最大的潜力,特别是通过熔融碳酸盐电解或太阳能热电化学过程(STEP)生产时,其工作温度约为750-770°C,接近大气压。与传统的CVD技术相比,这些方法具有较高的碳转化效率和显著降低的估计生产成本,因为它们的操作更简单,材料成本更低。石墨烯虽然质量很高,但需要大约1000°C的温度和昂贵的催化剂,这使得它的可扩展性较差。富勒烯(C60)和钻石的产率非常低(1%),并且需要极高的压力(高达1000 atm),限制了它们的工业应用。多孔碳,在500-850℃下通过电化学或金属/无机还原合成,有望用于超级电容器和吸附,收率高达55.3% wt %,并具有内置掺杂能力。使用Mg、Zn和NaBH4的金属介导方法具有简单、条件适中和结构可调的优点,而新的混合方法具有协同效应。总的来说,熔盐电化学方法是非常有前途的可扩展和节能工艺,支持可持续碳材料生产中的二氧化碳增值。
{"title":"A comprehensive review on the conversion of CO2 into solid carbon materials","authors":"Bentolhoda Chenarani,&nbsp;Ahad Ghaemi,&nbsp;Alireza Hemmati","doi":"10.1016/j.ccst.2025.100547","DOIUrl":"10.1016/j.ccst.2025.100547","url":null,"abstract":"<div><div>The conversion of carbon dioxide (CO<sub>2</sub>) into valuable solid carbon materials presents a promising approach for carbon utilization and climate change mitigation. This review systematically evaluates six major carbon allotropes: graphene, carbon nanotubes (CNTs), carbon nanofibers (CNFs), fullerenes, diamonds, and porous carbon, with a focus on synthesis methods, operating conditions, and industrial feasibility. Among these, CNTs and CNFs show the highest potential, especially when produced via molten carbonate electrolysis or the Solar Thermal Electrochemical Process (STEP), which operate at approximately 750–770 °C and near-atmospheric pressure. These methods have demonstrated high carbon conversion efficiencies and significantly lower estimated production costs compared to conventional CVD techniques, due to their simpler operation and lower material costs. Graphene, although high in quality, requires approximately 1000 °C and expensive catalysts, making it less scalable. Fullerenes (C<sub>60</sub>) and diamonds have very low yields (&lt;1 %) and require extreme pressures (up to 1000 atm), limiting their industrial use. Porous carbons, synthesized electrochemically or by metal/inorganic reduction at 500–850 °C, show promise for supercapacitors and adsorption, with yields up to 55.3 wt % and built-in doping capabilities. Metal-mediated methods using Mg, Zn, and NaBH<sub>4</sub> offer simplicity, moderate conditions, and tunable structures, while new hybrid approaches provide synergistic benefits. Overall, molten salt electrochemical methods are highly promising candidates for scalable and energy-efficient processes, supporting CO<sub>2</sub> valorization in sustainable carbon material production.</div></div>","PeriodicalId":9387,"journal":{"name":"Carbon Capture Science & Technology","volume":"18 ","pages":"Article 100547"},"PeriodicalIF":0.0,"publicationDate":"2025-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145683712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Continuous electrolytic methanol synthesis from air-captured CO2 at ordinary temperature and pressure 在常温常压下,用空气捕获的二氧化碳连续电解合成甲醇
Pub Date : 2025-11-28 DOI: 10.1016/j.ccst.2025.100552
Yoshiyuki Sakamoto , Yuna Takeno , Yusaku F. Nishimura , Yohsuke Mizutani , Shintaro Mizuno , Ryo Hishinuma , Kazumasa Okamura , Yasuhiko Takeda , Tsuyoshi Hamaguchi , Masaoki Iwasaki
A system for synthesizing methanol (MeOH) from carbon dioxide (CO2) in the air as a feedstock using electrical energy was developed to open a new avenue for atmospheric carbon capture and utilization. This system integrates three processes: direct air capture (DAC), direct carbonate reduction (DCR), and MeOH synthesis (MeS). A mixture of potassium carbonate and potassium bicarbonate aqueous solutions captures CO2 from the air as carbonate ions. Carbonate ions in the solution are directly reduced electrolytically to carbon monoxide (CO) using a nanoporous gold electrocatalyst. The produced CO is subsequently reduced electrolytically to MeOH using a cobalt phthalocyanine/carbon nanotube electrocatalyst. The system operated stably for 1.5 h, showing continuous CO2 capture and MeOH synthesis. This demonstrates the feasibility of the DAC-DCR-MeS integrated system operating under ordinary temperature and pressure conditions throughout all the steps. A notable feature of no need for high temperature or high pressure makes the system compatible with time-varying renewable energies including solar energy, which are essential for reducing net CO2 emissions.
开发了一种以空气中的二氧化碳(CO2)为原料,利用电能合成甲醇(MeOH)的系统,为大气碳捕获和利用开辟了一条新的途径。该系统集成了三个过程:直接空气捕获(DAC)、直接碳酸盐还原(DCR)和甲醇合成(MeS)。碳酸钾和碳酸氢钾水溶液的混合物以碳酸盐离子的形式从空气中捕获二氧化碳。溶液中的碳酸盐离子通过纳米孔金电催化剂直接电解还原为一氧化碳(CO)。生成的CO随后使用钴酞菁/碳纳米管电催化剂电解还原为甲醇。系统稳定运行1.5 h, CO2连续捕获,MeOH连续合成。这证明了DAC-DCR-MeS集成系统在所有步骤中在常温常压条件下工作的可行性。一个显著的特点是不需要高温或高压,使系统兼容时变可再生能源,包括太阳能,这对减少净二氧化碳排放至关重要。
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引用次数: 0
Hybrid ionic liquid amine solvents for CO₂ capture from natural gas: a systematic review of techno-economic and environmental performance 用于从天然气中捕集二氧化碳的混合离子液体胺溶剂:技术、经济和环境性能的系统综述
Pub Date : 2025-11-26 DOI: 10.1016/j.ccst.2025.100549
Syed Ali Ammar Taqvi , Bilal Kazmi , Dagmar Juchelková , Muhammad Shahbaz , Salman Raza Naqvi
The global transition to clean energy demands reliable low-carbon fuels, positioning natural gas (NG) as a critical bridge in mitigating climate change. Its lower greenhouse gas emissions compared to coal and oil, combined with abundant reserves, make NG a vital option for sustainable power generation and industrial use. However, its environmental benefits depend on effective purification, particularly CO₂ removal, which determines gas quality, efficiency, and processing costs. This study critically reviews recent developments (2000–2024) in CO₂ capture from NG using hybrid ionic liquid–amine systems, evaluating techno-economic and environmental performance. A systematic evaluation was performed using published experimental, modelling, and process simulation data. Published data concerning experimental, modelling, and techno-economic data were considered in a systematic evaluation to compare the performance of conventional absorption, adsorption, membrane, cryogenic and hybrid solvent processes. Hybrid IL–amine solvents achieve 93–98 % CO₂ capture efficiency with 20–30 % lower regeneration energy compared to MEA, although at TRL 5–6. These developments highlight the potential of NG to serve as a cleaner transitional fuel while reinforcing the need for integrated policies and technologies that ensure responsible production and utilization. Advancing purification technologies are therefore central to maximizing the role of natural gas in the global clean energy transition.
全球向清洁能源的转型需要可靠的低碳燃料,天然气被定位为减缓气候变化的关键桥梁。与煤炭和石油相比,天然气的温室气体排放量更低,加上储量丰富,使其成为可持续发电和工业使用的重要选择。然而,它的环境效益取决于有效的净化,特别是CO₂的去除,这决定了气体的质量、效率和处理成本。本研究批判性地回顾了使用混合离子液体-胺系统从天然气中捕集CO₂的最新进展(2000-2024),评估了技术经济和环境性能。使用已发表的实验、建模和过程模拟数据进行系统评估。在系统评估中考虑了有关实验、建模和技术经济数据的公开数据,以比较传统吸收、吸附、膜、低温和混合溶剂工艺的性能。混合il -胺溶剂达到93 - 98%的CO₂捕获效率,与MEA相比,再生能量低20 - 30%,尽管TRL为5-6。这些发展突出了天然气作为一种更清洁的过渡燃料的潜力,同时加强了确保负责任的生产和利用的综合政策和技术的必要性。因此,先进的净化技术对于最大限度地发挥天然气在全球清洁能源转型中的作用至关重要。
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引用次数: 0
Amine-functionalized MOF-based hybrid membranes for CO₂ separation: Molecular interactions and separation performance 氨基功能化mof基杂化膜用于CO₂分离:分子相互作用和分离性能
Pub Date : 2025-11-15 DOI: 10.1016/j.ccst.2025.100542
Nadia Hartini Suhaimi , Norwahyu Jusoh , Boon Kar Yap , Mohammad Nur-E-Alam , Nonni Soraya Sambudi , Li Sze Lai , Amir Izzuddin Adnan
Polymer-filler incompatibility and interface defects are key challenges faced in hybrid membranes, hindering the effective separation performance in CO2 separation applications. Ligand modification on the metal-organic framework (MOF)-based filler is a beneficial approach to overcome these challenges by creating hydrogen bonding, which positively impacts the interfacial compatibility. This review aims to elucidate the role of amine-functionalization (-NH2) by discussing available synthesis techniques, its influence on the physicochemical properties of modified fillers, and macroscopic separation performance. Additionally, this review specifically highlights the NH2 group interactions at the filler-polymer-gas interface, which contribute to positive CO2 separation performance. Besides, the key challenges associated with adding amine-functionalized MOF-based filler within hybrid membranes are outlined, along with adaptive measures proposed in tackling these challenges. Overall, this review highlights the role of –NH₂ ligand modification in amine-functionalized MOF-based hybrid membranes, emphasizing current progress and outlining future potential to advance research in CO₂ separation technologies.
聚合物与填料的不相容性和界面缺陷是杂化膜面临的主要挑战,阻碍了其在CO2分离中的有效分离性能。在金属-有机骨架(MOF)基填料上进行配体修饰是克服这些挑战的一种有益方法,它可以产生氢键,从而对界面相容性产生积极影响。本文从胺功能化(-NH2)的合成技术、对改性填料理化性质的影响以及宏观分离性能等方面阐述了氨基功能化(-NH2)在改性填料中的作用。此外,本文特别强调了填料-聚合物-气体界面上NH2基团的相互作用,这有助于CO2的正分离性能。此外,概述了在杂化膜中添加胺功能化mof填料的关键挑战,以及解决这些挑战的自适应措施。总之,本文综述了- nh2配体修饰在胺功能化mof基杂化膜中的作用,强调了目前的进展,并概述了未来CO₂分离技术的研究潜力。
{"title":"Amine-functionalized MOF-based hybrid membranes for CO₂ separation: Molecular interactions and separation performance","authors":"Nadia Hartini Suhaimi ,&nbsp;Norwahyu Jusoh ,&nbsp;Boon Kar Yap ,&nbsp;Mohammad Nur-E-Alam ,&nbsp;Nonni Soraya Sambudi ,&nbsp;Li Sze Lai ,&nbsp;Amir Izzuddin Adnan","doi":"10.1016/j.ccst.2025.100542","DOIUrl":"10.1016/j.ccst.2025.100542","url":null,"abstract":"<div><div>Polymer-filler incompatibility and interface defects are key challenges faced in hybrid membranes, hindering the effective separation performance in CO<sub>2</sub> separation applications. Ligand modification on the metal-organic framework (MOF)-based filler is a beneficial approach to overcome these challenges by creating hydrogen bonding, which positively impacts the interfacial compatibility. This review aims to elucidate the role of amine-functionalization (-NH<sub>2</sub>) by discussing available synthesis techniques, its influence on the physicochemical properties of modified fillers, and macroscopic separation performance. Additionally, this review specifically highlights the NH<sub>2</sub> group interactions at the filler-polymer-gas interface, which contribute to positive CO<sub>2</sub> separation performance. Besides, the key challenges associated with adding amine-functionalized MOF-based filler within hybrid membranes are outlined, along with adaptive measures proposed in tackling these challenges. Overall, this review highlights the role of –NH₂ ligand modification in amine-functionalized MOF-based hybrid membranes, emphasizing current progress and outlining future potential to advance research in CO₂ separation technologies.</div></div>","PeriodicalId":9387,"journal":{"name":"Carbon Capture Science & Technology","volume":"17 ","pages":"Article 100542"},"PeriodicalIF":0.0,"publicationDate":"2025-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145568350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Performance analysis of oil recovery and CO2 retention in a greenfield residual oil zone: CO2-EOR in Tall Cotton Field (Permian Basin, West Texas, USA) 新油田剩余油区采收率和CO2滞留性能分析:美国德克萨斯州西部二叠纪盆地Tall棉田CO2- eor
Pub Date : 2025-11-15 DOI: 10.1016/j.ccst.2025.100544
C. Özgen Karacan
Residual oil zones (ROZs) can offer significant oil resources via enhanced oil recovery (EOR) as well as subsurface carbon dioxide (CO2) retention during injection. If injected CO2 is anthropogenic, the ROZs can offer a substantial geologic storage potential. The ROZs below the oil/water contact (OWC) of main pay zones (MPZ) in conventional reservoirs or brownfields, are more commonly developed for CO2 injection and oil production and reported in the literature. However, CO2-EOR in greenfield ROZs, reservoirs without a MPZ present, have rarely been developed for CO2-EOR operation. The Tall Cotton Field of West Texas, Permian Basin, which started production in 2015 (Phase 1) and expanded in 2017 (Phase 2) from the San Andres Limestone, is one of the first examples of greenfield ROZs developed for EOR by injecting CO2.
This paper analyses EOR and CO2 retention performance of Tall Cotton Field using allocated injection and production data from inverted 5-spot well patterns of Phase-1 and -2 developments. Production and injection data allocated to each of the 28 identified patterns (nine 20-acre patterns for Phase-1, three 20-acre and sixteen 10-acre patterns for Phase-2) were analyzed for historical and forecasted oil recovery using ratio-trend decline analysis, and for CO2 retention performance of the patterns. The allocated data were further used to calculate injected reservoir pore volume and void replacement ratios (VRR) for the analysis period. Quantitative results indicated that oil recovery factors of the 5-spot patterns varied between 4–10 %, and 5–30 % between the end of injection and the forecast periods, respectively. Storage of CO2, on the other hand, increased to a mean value of ∼7130 MMscf per pattern in Phase-1 and to a mean storage of 3700 MMscf per pattern in Phase-2 until the end of injection, followed by a decline after the end of injection and into the forecast period. Resulting CO2 utilization factors ∼6–50 Mscf/bbl were estimated at the end of injection. Overall, presented results suggested that developing greenfield ROZs for CO2-EOR can be as promising as brownfield ROZs and mature MPZs for EOR and underground storage of injected CO2. For Tall Cotton Field, results suggest that Phase-2 patterns generally outperformed Phase-1 for oil recovery factors, while Phase-1 performed better in CO2 retention performance metrics. This is the first study in the literature that reports a detailed CO2-EOR performance analysis of a greenfield ROZ in the Permian Basin, which can potentially allow for comparison with MPZs and brownfield ROZs.
剩余油区(ROZs)可以通过提高采收率(EOR)以及在注入过程中保留地下二氧化碳(CO2)来提供重要的石油资源。如果注入的二氧化碳是人为的,则roz可以提供大量的地质储存潜力。在常规油藏或棕地中,主要产层(MPZ)油水接触面(OWC)以下的roz更常被开发用于二氧化碳注入和采油,并在文献中有所报道。然而,在未开发的roz中,没有MPZ的油藏,很少进行二氧化碳eor操作。西德克萨斯州二叠纪盆地的Tall棉花田于2015年开始生产(第一期),并于2017年从圣安德烈斯石灰岩(San Andres Limestone)扩建(第二期),是通过注入二氧化碳进行EOR开发的绿地roz的首批例子之一。本文利用1期和2期倒置5点井网的分配注采数据,分析了Tall棉田的EOR和CO2滞留性能。利用比值趋势下降分析的方法,对28个已确定的模式(第一阶段为9个20英亩模式,第二阶段为3个20英亩模式和16个10英亩模式)的生产和注入数据进行了历史和预测采收率分析,并对模式的二氧化碳保留性能进行了分析。利用分配的数据进一步计算分析期内的注入储层孔隙体积和空隙替代比(VRR)。定量结果表明,从注井结束到预测期,5点模式的采收率分别在4 - 10%和5- 30%之间变化。另一方面,二氧化碳的储存量在第一阶段增加到每个模式的平均值约7130 MMscf,在第二阶段增加到每个模式的平均储存量3700 MMscf,直到注入结束,然后在注入结束后进入预测期。在注入结束时,估计CO2利用系数为6-50毫立方英尺/桶。总的来说,研究结果表明,开发用于二氧化碳提高采收率的绿地roz与开发用于提高采收率和注入二氧化碳地下储存的棕地roz和成熟mpz一样有前景。对于Tall Cotton Field,结果表明phase 2模式在采收率方面总体优于phase 1模式,而phase 1模式在CO2保留性能指标方面表现更好。这是文献中第一次对二叠纪盆地绿地ROZ进行详细的CO2-EOR性能分析,可以与mpz和棕地ROZ进行比较。
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Carbon Capture Science & Technology
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