Pub Date : 2025-12-01Epub Date: 2025-10-30DOI: 10.1016/j.ccst.2025.100536
Naveed Akhtar , Habib Ullah , Amir Zada , Shohreh Azizi , Muhammad Ateeq , Javed Ali Khan , Muhammad Ishaq Ali Shah , Mohammad Naeem , Muhammad Shakeel Khan , Zakir Ullah , Hyun You Kim
Transforming carbon dioxide (CO2) into valuable fuels and chemicals through photocatalysis and electrocatalysis presents a sustainable approach to reducing carbon emissions and tackling global energy challenges. However, the major hurdles lie in the low activity and selectivity of these processes. This review critically analyzes the fundamental mechanisms and reaction pathways for CO2 reduction, with a focus on photocatalytic and electrocatalytic approaches. Key factors influencing product selectivities, including the band structure of photocatalysts, light-excitation properties, charge carrier separation, and surface interactions, are thoroughly examined. We also emphasize recent advancements such as bandgap engineering, doping, nanostructure tailoring, and the use of innovative catalysts to enhance selectivity and efficiency. Unlike previous reviews that focus on either photocatalysis or electrocatalysis in isolation, this review offers a unified perspective on both system, whether highlighting comparative trends, mechanistic insights, and future research directions. This integrated and comprehensive analysis fills a critical gap in the current literature and expected to guide the development of next-generation catalytic systems for efficient and selective CO2 conversion.
{"title":"CO2 reduction reimagined: From light-driven to electrocatalytic pathways with computational insight towards enhanced product selectivity","authors":"Naveed Akhtar , Habib Ullah , Amir Zada , Shohreh Azizi , Muhammad Ateeq , Javed Ali Khan , Muhammad Ishaq Ali Shah , Mohammad Naeem , Muhammad Shakeel Khan , Zakir Ullah , Hyun You Kim","doi":"10.1016/j.ccst.2025.100536","DOIUrl":"10.1016/j.ccst.2025.100536","url":null,"abstract":"<div><div>Transforming carbon dioxide (CO<sub>2</sub>) into valuable fuels and chemicals through photocatalysis and electrocatalysis presents a sustainable approach to reducing carbon emissions and tackling global energy challenges. However, the major hurdles lie in the low activity and selectivity of these processes. This review critically analyzes the fundamental mechanisms and reaction pathways for CO<sub>2</sub> reduction, with a focus on photocatalytic and electrocatalytic approaches. Key factors influencing product selectivities, including the band structure of photocatalysts, light-excitation properties, charge carrier separation, and surface interactions, are thoroughly examined. We also emphasize recent advancements such as bandgap engineering, doping, nanostructure tailoring, and the use of innovative catalysts to enhance selectivity and efficiency. Unlike previous reviews that focus on either photocatalysis or electrocatalysis in isolation, this review offers a unified perspective on both system, whether highlighting comparative trends, mechanistic insights, and future research directions. This integrated and comprehensive analysis fills a critical gap in the current literature and expected to guide the development of next-generation catalytic systems for efficient and selective CO<sub>2</sub> conversion.</div></div>","PeriodicalId":9387,"journal":{"name":"Carbon Capture Science & Technology","volume":"17 ","pages":"Article 100536"},"PeriodicalIF":0.0,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145516638","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}
Pub Date : 2025-12-01Epub Date: 2025-11-21DOI: 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.
{"title":"Prediction of CO2 capture performance of a direct air capture unit under representative atmospheric flow conditions using large eddy simulation","authors":"Esmaeel Eftekharian , Ali Kiani , Vassili Kitsios , Ashok K. Luhar , Paul Feron , Aaron W. Thornton , 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}
Pub Date : 2025-12-01Epub Date: 2025-11-15DOI: 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.
{"title":"Integrating diabatic CAES with post-combustion capture to mitigate combustion emissions: case study and regional sensitivity","authors":"Zhaoxi Dong , Yurong Liu , Feihu Ma , Honghai Ma , Xin Peng , Weimin Zhong , Feng Qian","doi":"10.1016/j.ccst.2025.100543","DOIUrl":"10.1016/j.ccst.2025.100543","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":9387,"journal":{"name":"Carbon Capture Science & Technology","volume":"17 ","pages":"Article 100543"},"PeriodicalIF":0.0,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145614608","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}
Pub Date : 2025-12-01Epub Date: 2025-10-15DOI: 10.1016/j.ccst.2025.100531
Lei Liu, Hao Wang, Hanzi Liu, Zhiqiang Sun
Integrated carbon capture and utilization coupled with reverse water-gas shift reaction is a promising technology for converting captured CO2 into value-added CO or syngas using a Ca-based dual functional material (DFM). However, existing Ca-based DMFs are primarily powder-based formulations, which poses challenges for their direct application in a real fluidized-bed reactor, and the attrition characteristics of DFM particles remain largely unexplored. Herein, a micro-fluidized-bed thermogravimetric analyzer coupled with a mass spectrometer (MFB-TGA-MS) was employed to investigate the attrition properties of three types of well-prepared Ca-based DFM particles under fluidizing conditions. It was found that Al-modified Ca-based DFM retained ∼6 mmol g-1 CO2 after 100 cycles, but high forming pressure reduced this to ∼4 mmol g-1 while low pressure caused 2.24 % h-1 physical loss in the first 10 cycles. Physical loss peaked within 20 cycles, while chemical loss occurred mainly before cycle 40 for the DFM without Al and shifted to cycles 40–80 with Al. SEM and TEM confirmed that the Al skeleton is beneficial for reducing the chemical loss via suppressing the sintering of Ni and CaO. However, high pellet-forming pressure would lessen the pore structure, hindering the volume change during the capture and hydrogenation processes. Finally, the integrated carbon capture and utilization - reverse water gas shift (ICCU-RWGS) performance was analyzed over a wide range of CO2 and H2 partial pressures. Decoupling of DFM particle attrition into chemical loss and physical loss provides insight to develop a highly efficient DFM particle.
{"title":"Attrition characteristics of Ca-based dual functional material in a micro fluidized-bed reactor for integrated CO2 capture and conversion","authors":"Lei Liu, Hao Wang, Hanzi Liu, Zhiqiang Sun","doi":"10.1016/j.ccst.2025.100531","DOIUrl":"10.1016/j.ccst.2025.100531","url":null,"abstract":"<div><div>Integrated carbon capture and utilization coupled with reverse water-gas shift reaction is a promising technology for converting captured CO<sub>2</sub> into value-added CO or syngas using a Ca-based dual functional material (DFM). However, existing Ca-based DMFs are primarily powder-based formulations, which poses challenges for their direct application in a real fluidized-bed reactor, and the attrition characteristics of DFM particles remain largely unexplored. Herein, a micro-fluidized-bed thermogravimetric analyzer coupled with a mass spectrometer (MFB-TGA-MS) was employed to investigate the attrition properties of three types of well-prepared Ca-based DFM particles under fluidizing conditions. It was found that Al-modified Ca-based DFM retained ∼6 mmol g<sup>-1</sup> CO<sub>2</sub> after 100 cycles, but high forming pressure reduced this to ∼4 mmol g<sup>-1</sup> while low pressure caused 2.24 % h<sup>-1</sup> physical loss in the first 10 cycles. Physical loss peaked within 20 cycles, while chemical loss occurred mainly before cycle 40 for the DFM without Al and shifted to cycles 40–80 with Al. SEM and TEM confirmed that the Al skeleton is beneficial for reducing the chemical loss via suppressing the sintering of Ni and CaO. However, high pellet-forming pressure would lessen the pore structure, hindering the volume change during the capture and hydrogenation processes. Finally, the integrated carbon capture and utilization - reverse water gas shift (ICCU-RWGS) performance was analyzed over a wide range of CO<sub>2</sub> and H<sub>2</sub> partial pressures. Decoupling of DFM particle attrition into chemical loss and physical loss provides insight to develop a highly efficient DFM particle.</div></div>","PeriodicalId":9387,"journal":{"name":"Carbon Capture Science & Technology","volume":"17 ","pages":"Article 100531"},"PeriodicalIF":0.0,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145358424","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}
Pub Date : 2025-12-01Epub Date: 2025-10-28DOI: 10.1016/j.ccst.2025.100535
Pengjun Cui , Godknows Dziva , Tingting Song , Sandeep Dhital , Shengping Wang , Liang Zeng
This study proposed a dual moving bed reactor configuration for the calcium looping (CaL) process, aiming to improve CO2 capture efficiency and reduce the energy consumption. A multistage thermodynamic equilibrium model was developed to simulate the gas-solid countercurrent reactive flow pattern. A comparative study was conducted between the proposed dual moving bed (DMB) CaL system and the conventional dual fluidized bed (DFB) configuration. At an RCa/C = 4, the gas-solid countercurrent moving bed carbonator can achieve a CO2 capture efficiency exceeding 95 %, an improvement of over 3 % compared to the fluidized bed system operating at 650 °C. Internal countercurrent heat exchange of the MB carbonator increases the solid outlet temperature by approximately 60 °C, consequently reducing the calciner’s fuel consumption by 5.04 %. The gas-solid countercurrent flow in the calciner improved internal heat integration and further decreased fuel demand by 13.71 %. Thus, the DMB CaL system attained a calciner-specific energy consumption of 3.61 GJ/t CO2, representing a 19.78 % reduction from the DFB CaL system. When integrated into a coal-fired power plant, the specific energy consumption for CO2 avoided (SPECCA) is 2.40 GJ/t CO2, an 8.40 % decrease compared to the DFB CaL process. This improvement enhances the techno-economic performance of the CaL process and highlights its potential for industrial CO2 capture.
{"title":"Dual moving bed calcium looping process: Optimizing CO2 capture efficiency and energy utilization","authors":"Pengjun Cui , Godknows Dziva , Tingting Song , Sandeep Dhital , Shengping Wang , Liang Zeng","doi":"10.1016/j.ccst.2025.100535","DOIUrl":"10.1016/j.ccst.2025.100535","url":null,"abstract":"<div><div>This study proposed a dual moving bed reactor configuration for the calcium looping (CaL) process, aiming to improve CO<sub>2</sub> capture efficiency and reduce the energy consumption. A multistage thermodynamic equilibrium model was developed to simulate the gas-solid countercurrent reactive flow pattern. A comparative study was conducted between the proposed dual moving bed (DMB) CaL system and the conventional dual fluidized bed (DFB) configuration. At an R<sub>Ca/</sub><em><sub>C</sub></em> = 4, the gas-solid countercurrent moving bed carbonator can achieve a CO<sub>2</sub> capture efficiency exceeding 95 %, an improvement of over 3 % compared to the fluidized bed system operating at 650 °C. Internal countercurrent heat exchange of the MB carbonator increases the solid outlet temperature by approximately 60 °C, consequently reducing the calciner’s fuel consumption by 5.04 %. The gas-solid countercurrent flow in the calciner improved internal heat integration and further decreased fuel demand by 13.71 %. Thus, the DMB CaL system attained a calciner-specific energy consumption of 3.61 GJ/t CO<sub>2</sub>, representing a 19.78 % reduction from the DFB CaL system. When integrated into a coal-fired power plant, the specific energy consumption for CO<sub>2</sub> avoided (SPECCA) is 2.40 GJ/t CO<sub>2</sub>, an 8.40 % decrease compared to the DFB CaL process. This improvement enhances the techno-economic performance of the CaL process and highlights its potential for industrial CO<sub>2</sub> capture.</div></div>","PeriodicalId":9387,"journal":{"name":"Carbon Capture Science & Technology","volume":"17 ","pages":"Article 100535"},"PeriodicalIF":0.0,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145412813","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}
Pub Date : 2025-09-01Epub Date: 2025-08-24DOI: 10.1016/j.ccst.2025.100493
Ye-Sub Son , Shaukat Ali Mazari , Min-Kyeong Oh , Gwan Hong Min , Hyung Jin Park , Sunghoon Lee , Il-Hyun Baek , Chang-Ha Lee , Jong-Ho Moon , Sung-Chan Nam
The contribution of solvent regeneration energy to amine-based CO2 capture processes is a major hurdle to their large-scale economic viability. It is important to develop solvents that reduce CO2 capture cost without compromising the process performance or operations. To reduce regeneration energy, this study focuses on the development of aqueous blends of piperazine (PZ) and 3-dimethylamino-1-propanol (3DMA1P) as an energy-efficient absorbent for CO2 capture. The study relies on rigorous modeling, supported by experimental data. The experimental data from this study and the literature includes CO2 solubility, NMR speciation, heat of absorption, and physical properties. To determine the potential application of PZ-3DMA1P blend for CO2 capture, their equilibrium CO2 solubility, cyclic capacity, heat of absorption, and, more importantly, solvent regeneration energy was investigated. Regeneration energy is calculated and evaluated under the influence of various operating parameters such as absorber temperature (313.15–343.15 K), stripper temperature (373.15–403.15 K), CO2 partial pressure (1–30 kPa), stripper total pressure (200–400 kPa), CO2 recovery (80–95 %), amine blending ratio (PZ:3DMA1P, 0–10:40–30 wt.%) and water concentration (60–90 wt.%). The results were compared with those obtained under the same operating conditions using monoethanolamine (MEA) 30 and 40 wt.%, and CESAR-1, the benchmark solvents. Results of the current study for blends of PZ and 3DMA1P are promising, and the solvent system exhibits higher CO2 absorption capacity and lower regeneration energy compared to MEA and CESAR-1. A comprehensive parametric analysis of regeneration energy enhances the applicability of the results across a diverse range of industries.
{"title":"Energy-efficient CO2 capture with piperazine and 3-dimethylamino-1-propanol blends: Modeling, experimental validation, and regeneration energy optimization","authors":"Ye-Sub Son , Shaukat Ali Mazari , Min-Kyeong Oh , Gwan Hong Min , Hyung Jin Park , Sunghoon Lee , Il-Hyun Baek , Chang-Ha Lee , Jong-Ho Moon , Sung-Chan Nam","doi":"10.1016/j.ccst.2025.100493","DOIUrl":"10.1016/j.ccst.2025.100493","url":null,"abstract":"<div><div>The contribution of solvent regeneration energy to amine-based CO<sub>2</sub> capture processes is a major hurdle to their large-scale economic viability. It is important to develop solvents that reduce CO<sub>2</sub> capture cost without compromising the process performance or operations. To reduce regeneration energy, this study focuses on the development of aqueous blends of piperazine (PZ) and 3-dimethylamino-1-propanol (3DMA1P) as an energy-efficient absorbent for CO<sub>2</sub> capture. The study relies on rigorous modeling, supported by experimental data. The experimental data from this study and the literature includes CO<sub>2</sub> solubility, NMR speciation, heat of absorption, and physical properties. To determine the potential application of PZ-3DMA1P blend for CO<sub>2</sub> capture, their equilibrium CO<sub>2</sub> solubility, cyclic capacity, heat of absorption, and, more importantly, solvent regeneration energy was investigated. Regeneration energy is calculated and evaluated under the influence of various operating parameters such as absorber temperature (313.15–343.15 K), stripper temperature (373.15–403.15 K), CO<sub>2</sub> partial pressure (1–30 kPa), stripper total pressure (200–400 kPa), CO<sub>2</sub> recovery (80–95 %), amine blending ratio (PZ:3DMA1P, 0–10:40–30 wt.%) and water concentration (60–90 wt.%). The results were compared with those obtained under the same operating conditions using monoethanolamine (MEA) 30 and 40 wt.%, and CESAR-1, the benchmark solvents. Results of the current study for blends of PZ and 3DMA1P are promising, and the solvent system exhibits higher CO<sub>2</sub> absorption capacity and lower regeneration energy compared to MEA and CESAR-1. A comprehensive parametric analysis of regeneration energy enhances the applicability of the results across a diverse range of industries.</div></div>","PeriodicalId":9387,"journal":{"name":"Carbon Capture Science & Technology","volume":"16 ","pages":"Article 100493"},"PeriodicalIF":0.0,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144913238","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}
Flowback and produced water (FPW) from hydraulic fracturing operations of tight hydrocarbon reservoirs has attracted significant research interest, particularly regarding its treatment and the recovery of valuable minerals. In this study, a simple and sustainable method was developed to precipitate calcium (Ca), magnesium (Mg), and strontium (Sr) carbonates from a high salinity FPW using NH3 or NaOH and CO2-containing flue gas. The precipitated solids and the treated FPW solution were subjected to various characterization techniques to evaluate the properties of the solids and the efficiency of the precipitation method. The precipitated carbonate minerals were further investigated as sorbents for CO2 capture in the calcium looping process, demonstrating a substantial carbon capture capacity of approximately 0.3 kg CO2/kg solid sample. Moreover, a series of detailed process simulations and economic analysis were performed to further evaluate the potential of using solid precipitates from FPW in the calcium looping process. Two different operating modes and multiple cases of calcium looping using solid sorbents from FPW, integrated with renewable energy, were thoroughly studied. The economic analysis of this integrated technology showed a relatively comparable levelized cost of carbon capture, at less than $200 per tonne of CO2 captured. The techno-economic analysis of the overall process demonstrated the potential of the calcium looping process with carbonate precipitates from produced water as a possible approach for decarbonization and energy transition in the oil and gas industry.
致密油气储层水力压裂返排和采出水（FPW）引起了人们极大的研究兴趣，特别是在其处理和有价值矿物的回收方面。在本研究中，开发了一种简单且可持续的方法，利用NH3或NaOH和含二氧化碳的烟气从高盐度FPW中沉淀钙（Ca）、镁（Mg）和锶（Sr）碳酸盐。对沉淀固体和处理后的FPW溶液进行了各种表征技术，以评估固体的性质和沉淀方法的效率。进一步研究了沉淀的碳酸盐矿物作为钙环过程中二氧化碳捕获的吸附剂，证明了大约0.3 kg CO2/kg固体样品的可观碳捕获能力。此外，还进行了一系列详细的过程模拟和经济分析，以进一步评估在钙循环过程中使用FPW固体沉淀物的潜力。对FPW固体吸附剂与可再生能源相结合的两种不同操作模式和多例钙循环进行了深入研究。对这一综合技术的经济分析表明，碳捕获的成本相对相当，每捕获一吨二氧化碳不到200美元。对整个过程的技术经济分析表明，利用采出水中的碳酸盐沉淀物进行钙环工艺的潜力，可能是石油和天然气行业脱碳和能源转型的一种方法。
{"title":"Experimental investigation and techno-economic assessment of oilfield brine-derived carbonates for calcium looping CO2 capture","authors":"Rufan Zhou , Chunqing Jiang , Rafal Gieleciak , Lava Kumar Pillari , Lukas Bichler","doi":"10.1016/j.ccst.2025.100489","DOIUrl":"10.1016/j.ccst.2025.100489","url":null,"abstract":"<div><div>Flowback and produced water (FPW) from hydraulic fracturing operations of tight hydrocarbon reservoirs has attracted significant research interest, particularly regarding its treatment and the recovery of valuable minerals. In this study, a simple and sustainable method was developed to precipitate calcium (Ca), magnesium (Mg), and strontium (Sr) carbonates from a high salinity FPW using NH<sub>3</sub> or NaOH and CO<sub>2</sub>-containing flue gas. The precipitated solids and the treated FPW solution were subjected to various characterization techniques to evaluate the properties of the solids and the efficiency of the precipitation method. The precipitated carbonate minerals were further investigated as sorbents for CO<sub>2</sub> capture in the calcium looping process, demonstrating a substantial carbon capture capacity of approximately 0.3 kg CO<sub>2</sub>/kg solid sample. Moreover, a series of detailed process simulations and economic analysis were performed to further evaluate the potential of using solid precipitates from FPW in the calcium looping process. Two different operating modes and multiple cases of calcium looping using solid sorbents from FPW, integrated with renewable energy, were thoroughly studied. The economic analysis of this integrated technology showed a relatively comparable levelized cost of carbon capture, at less than $200 per tonne of CO<sub>2</sub> captured. The techno-economic analysis of the overall process demonstrated the potential of the calcium looping process with carbonate precipitates from produced water as a possible approach for decarbonization and energy transition in the oil and gas industry.</div></div>","PeriodicalId":9387,"journal":{"name":"Carbon Capture Science & Technology","volume":"16 ","pages":"Article 100489"},"PeriodicalIF":0.0,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144889727","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}
Pub Date : 2025-09-01Epub Date: 2025-08-12DOI: 10.1016/j.ccst.2025.100479
Fabrice Ndayisenga , Anam Jalil , Ed W.J. van Niel , Chengyu Zhang , Longyu Wang , Berhanu Sugebo Helallo , Hikmatullah Ahmadi , Théogène Habumugisha , Yiming Zhang , Dandan Zhou , Zhisheng Yu
Sorption-enhanced steam reforming (SorESR) is an advanced thermochemical process integrating in-situ CO2 capture via solid sorbents to significantly enhance hydrogen production and purity. By coupling CO2 adsorption with steam reforming, SorESR shifts the reaction equilibrium toward increased H₂ yield, surpassing the limitations of conventional steam reforming (SR). The efficacy of SorESR critically depends on the physicochemical properties of the solid CO2 sorbents employed. This review critically evaluates widely studied sorbents, including Ca-based, Mg-based, hydrotalcite-like, and alkali ceramic sorbents, focusing on their CO2 capture capacity, reaction kinetics, thermal stability, and cyclic durability under SR conditions. Furthermore, recent progress in multifunctional sorbent-catalysts that synergistically facilitate catalytic steam reforming alongside CO2 sorption is critically discussed. Moreover, the review summarises recent performance achievements and proposes strategies to improve sorbent capacity and reaction kinetics, thereby making the SorESR process more appealing for commercial applications. Large-scale SorESR implementation is expected to substantially increase hydrogen production efficiency while concurrently reducing CO2 emissions and advancing sustainable energy technologies. This review offers novel insights into the development of advanced sorbent-catalyst systems and provides new strategies for enhancing SorESR efficiency and scalability for commercial H2 Production.
{"title":"Sorption-enhanced steam reforming technology for promoting hydrogen production with in-situ CO2 capture: Recent advances and prospects","authors":"Fabrice Ndayisenga , Anam Jalil , Ed W.J. van Niel , Chengyu Zhang , Longyu Wang , Berhanu Sugebo Helallo , Hikmatullah Ahmadi , Théogène Habumugisha , Yiming Zhang , Dandan Zhou , Zhisheng Yu","doi":"10.1016/j.ccst.2025.100479","DOIUrl":"10.1016/j.ccst.2025.100479","url":null,"abstract":"<div><div>Sorption-enhanced steam reforming (SorESR) is an advanced thermochemical process integrating in-situ CO<sub>2</sub> capture via solid sorbents to significantly enhance hydrogen production and purity. By coupling CO<sub>2</sub> adsorption with steam reforming, SorESR shifts the reaction equilibrium toward increased H₂ yield, surpassing the limitations of conventional steam reforming (SR). The efficacy of SorESR critically depends on the physicochemical properties of the solid CO<sub>2</sub> sorbents employed. This review critically evaluates widely studied sorbents, including Ca-based, Mg-based, hydrotalcite-like, and alkali ceramic sorbents, focusing on their CO<sub>2</sub> capture capacity, reaction kinetics, thermal stability, and cyclic durability under SR conditions. Furthermore, recent progress in multifunctional sorbent-catalysts that synergistically facilitate catalytic steam reforming alongside CO<sub>2</sub> sorption is critically discussed. Moreover, the review summarises recent performance achievements and proposes strategies to improve sorbent capacity and reaction kinetics, thereby making the SorESR process more appealing for commercial applications. Large-scale SorESR implementation is expected to substantially increase hydrogen production efficiency while concurrently reducing CO<sub>2</sub> emissions and advancing sustainable energy technologies. This review offers novel insights into the development of advanced sorbent-catalyst systems and provides new strategies for enhancing SorESR efficiency and scalability for commercial H<sub>2</sub> Production.</div></div>","PeriodicalId":9387,"journal":{"name":"Carbon Capture Science & Technology","volume":"16 ","pages":"Article 100479"},"PeriodicalIF":0.0,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144860641","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}
Pub Date : 2025-09-01Epub Date: 2025-06-04DOI: 10.1016/j.ccst.2025.100452
Qiuming Zhou , Shuaishuai Lyu , Hongwei Li , Congcong Niu , Rongjun Zhang , Chaopeng Hou , Binhang Yan , Sen Wang , Bo Peng , Run Xu , Mingfeng Li
Selective removal of H2O in-situ from the reverse water gas shift (RWGS) reaction system is an effective approach to intensify the CO2 conversion dictated by thermodynamics. Here, a composite material is prepared by combining a water adsorbent zeolite NaY-2 which modified by hydrothermal treatment at 500°C with Pt/TiO2 catalyst. The synthesized Pt/TiO2-NaY-2 exhibits much higher activity and CO selectivity than conventional Pt/TiO2. It shows the highest CO2 conversion of 42.3% and consistently exceeds the corresponding thermodynamic equilibrium conversion (28.6%) over 120 h on stream with 100% CO selectivity at 340°C. The persistent catalytic enhancement is mainly attributed to the well aligning between the desorption temperature of H2O on NaY-2 (270°C, 330°C) and the reaction temperature. The introduced NaY-2 demonstrates an electronic effect on Pt/TiO2 during the reduction process and generates an electron-rich Pt species. The created Ptδ− sites on Pt/TiO2-NaY-2 possess higher intrinsic catalytic activity than Pt0 sites on Pt/TiO2. The interaction also reduces Pt average particle size and thus weakens the adsorption of CO on Pt, which inhibits the methanation side reaction then improves the CO selectivity on Pt/TiO2-NaY-2. The RWGS reactions on the synthesized Pt-based catalysts proceed through intermediate decomposition mechanism exposed by in-situ IR spectroscopy. The findings of this work provide information of high interest to guide future research on RWGS reaction intensified process via in-situ removal of H2O.
{"title":"A Highly Efficient Pt/TiO2-NaY-x Catalyst for RWGS reaction: Enhancement Effect of Adsorbent NaY-x on CO2 Hydrogenation Conversion","authors":"Qiuming Zhou , Shuaishuai Lyu , Hongwei Li , Congcong Niu , Rongjun Zhang , Chaopeng Hou , Binhang Yan , Sen Wang , Bo Peng , Run Xu , Mingfeng Li","doi":"10.1016/j.ccst.2025.100452","DOIUrl":"10.1016/j.ccst.2025.100452","url":null,"abstract":"<div><div>Selective removal of H<sub>2</sub>O <em>in-situ</em> from the reverse water gas shift (RWGS) reaction system is an effective approach to intensify the CO<sub>2</sub> conversion dictated by thermodynamics. Here, a composite material is prepared by combining a water adsorbent zeolite NaY-2 which modified by hydrothermal treatment at 500°C with Pt/TiO<sub>2</sub> catalyst. The synthesized Pt/TiO<sub>2</sub>-NaY-2 exhibits much higher activity and CO selectivity than conventional Pt/TiO<sub>2</sub>. It shows the highest CO<sub>2</sub> conversion of 42.3% and consistently exceeds the corresponding thermodynamic equilibrium conversion (28.6%) over 120 h on stream with 100% CO selectivity at 340°C. The persistent catalytic enhancement is mainly attributed to the well aligning between the desorption temperature of H<sub>2</sub>O on NaY-2 (270°C, 330°C) and the reaction temperature. The introduced NaY-2 demonstrates an electronic effect on Pt/TiO<sub>2</sub> during the reduction process and generates an electron-rich Pt species. The created Pt<sup>δ−</sup> sites on Pt/TiO<sub>2</sub>-NaY-2 possess higher intrinsic catalytic activity than Pt<sup>0</sup> sites on Pt/TiO<sub>2</sub>. The interaction also reduces Pt average particle size and thus weakens the adsorption of CO on Pt, which inhibits the methanation side reaction then improves the CO selectivity on Pt/TiO<sub>2</sub>-NaY-2. The RWGS reactions on the synthesized Pt-based catalysts proceed through intermediate decomposition mechanism exposed by <em>in-situ</em> IR spectroscopy. The findings of this work provide information of high interest to guide future research on RWGS reaction intensified process via <em>in-situ</em> removal of H<sub>2</sub>O.</div></div>","PeriodicalId":9387,"journal":{"name":"Carbon Capture Science & Technology","volume":"16 ","pages":"Article 100452"},"PeriodicalIF":0.0,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144469913","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}
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