Greenhouse Gases: Science and Technology最新文献

{"title":"A Study on Effect of Number of Low-Permeability Layers on Geological Carbon Sequestration in an Open Aquifer","authors":"Abhishek Gupta,&nbsp;Akshoy Ranjan Paul,&nbsp;Anuj Jain,&nbsp;Ramesh K. Agarwal","doi":"10.1002/ghg.2334","DOIUrl":"10.1002/ghg.2334","url":null,"abstract":"<div>\u0000 \u0000 <p>The use of fossil fuels to fulfill energy demand is responsible for CO₂ emissions, resulting in global warming and climate change. Despite the expansion in renewable energy sources, energy combustion and industrial processes caused a 0.9% increase (321 Mt) in global CO₂ emissions to a record high of 36.8 Gt in 2022. Carbon capture and sequestration (CCS) technology can allow the use of fossil fuel without damaging the environment by storing CO₂ underground, paving the way for a sustainable, low-carbon future. Without fracturing, both homogeneous and low-permeability aquifers can safely accommodate injected CO₂. This study investigates the effect of low-permeability layers composed of sandstone and shale layers on the capacity and performance of CO₂ storage in open saline aquifers. The CO₂ migration, dispersion, and reservoir pressure variations have been numerically investigated in a computational domain representing the Utsira Formation in Sleipner CCS project. In a homogeneous aquifer, rapid vertical migration results in 65% of the injected CO₂ accumulating at the top layer after 30 years. However, the presence of four low-permeability layers reduces this accumulation to 58% over the same period, demonstrating enhanced trapping efficiency. Long-term simulations indicate that CO₂ accumulation at the top surface increases to 75% of the total injected volume over 80 years. CO₂ dissipates and migrates over time, resulting in a decrease in surface pressure. Pressure analyses reveal that the peak injection-induced pressure remains within the fracture pressure limit (20–25 MPa), ensuring safe storage. After 30 years of injection, pressure at the top surface drops by 0.27 MPa (2.72%) within 2 years post-injection and continues to decrease gradually. This investigation contributes to a better understanding of the dynamics of CO₂ storage in open saline aquifers, thereby facilitating the development of effective CO₂ sequestration strategies. © 2025 Society of Chemical Industry and John Wiley &amp; Sons, Ltd.</p>\u0000 </div>","PeriodicalId":12796,"journal":{"name":"Greenhouse Gases: Science and Technology","volume":"15 2","pages":"206-218"},"PeriodicalIF":2.8,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143822056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of Reduction Pretreatment on Ni─Cu Bimetallic Catalysts and Their Catalytic Performance on CO2 Hydrogenation","authors":"Qihang Wen,&nbsp;Yifei Feng,&nbsp;Haoyuan Gu,&nbsp;Haitao Yan,&nbsp;Zixu Yang,&nbsp;Minghui Zhu,&nbsp;Jing Xu","doi":"10.1002/ghg.2332","DOIUrl":"10.1002/ghg.2332","url":null,"abstract":"<div>\u0000 \u0000 <p>The performance of bimetallic catalysts is closely related to their surface structure, and the surface reconstruction process can affect the distribution of active sites, electronic structure, and reactant adsorption behavior. Traditional research has mostly focused on optimizing synthesis processes, such as controlling the size and distribution of metal particles, whereas there is relatively little research on the effect of pretreatment conditions on the dynamic structure of catalysts. In this study, a 10Ni─1Cu catalyst was synthesized using the deposition–precipitation method, and the effects of different pretreatment conditions on its performance were investigated. The catalyst was first pretreated at 500°C in a 60%H₂/40%N₂ atmosphere, followed by reduction under different pretreatment atmospheres (10%H₂/90%N₂ or 15%CO₂/60%H₂/25%N₂) at the same temperature. At 400°C and a space velocity of 30 L h⁻¹ g⁻¹, the methane production rate of the catalyst treated in the reaction atmosphere significantly increased from 12.4 to 15.8 µmol g⁻¹ s⁻¹ compared to the catalyst treated with hydrogen alone. Characterization techniques, such as TEM, x-ray photoelectron spectroscopy (XPS), and diffuse reflectance infrared Fourier transform spectroscopy (CO-DRIFTS), were employed to study the structural properties of the catalysts, focusing on the surface properties after reduction and the surface species during the reaction. This study demonstrates that catalysts pretreated in the reaction atmosphere enhance methane production rates by regulating the surface structure and forming Ni─Cu alloy structures with a lower Ni/Cu ratio, thereby optimizing the selectivity of hydrogenation products.</p>\u0000 </div>","PeriodicalId":12796,"journal":{"name":"Greenhouse Gases: Science and Technology","volume":"15 2","pages":"197-205"},"PeriodicalIF":2.8,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143822221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Elucidation of Potable Water Accelerated Weathering of Limestone for Post-Combustion Carbon Capture: Correlation, Optimization, Comparative, Kinetic Modelling and Mass Transfer Analysis","authors":"Slyvester Yew Wang Chai,&nbsp;Bing Shen How,&nbsp;Lock Hei Ngu","doi":"10.1002/ghg.2329","DOIUrl":"10.1002/ghg.2329","url":null,"abstract":"<p>Energy generation and industrial processes are the main emitters of CO₂, with 37.4 billion tCO₂ in 2023, causing detrimental environmental effects. As absorption is the most established carbon capture technology, this research implements the accelerated weathering of limestone (AWL) process to capture CO₂ from post-combustion emissions. However, this work replaces the conventional water source for the AWL process, seawater, with potable water. A correlation study was performed to study the effect of the proposed process's liquid-to-gas (L/G) ratio on the performance (i.e., effluent's alkalinity and CO₂ capture efficiency). The correlation findings show that by decreasing the L/G ratio (1–0.003), the calcium bicarbonate (Ca(HCO₃)₂) effluent concentration (0.77–3.65 mM) and pH (5.58–7.47) increase significantly, whereas CO₂ capture efficiency (81.94%–20.82%) was adversely affected. The optimization analysis obtained the highest achievable alkalinity at 3.63 mM at an optimized liquid and gas flow rate of 0.024 and 10 L min⁻¹, respectively. Meanwhile, the liquid and gas flow rates of 1.23 and 1 L min⁻¹ achieved the highest CO₂ capture efficiency of 82.15%. It was deduced that potable water is better than seawater for CO₂ capture operation via the AWL process, achieving a 12.09%–39.14% better CO₂ capture efficiency when operated at similar conditions. In addition, the kinetic and mass transfer performance of the proposed process was also established in this work. Overall, this research establishes the potential of a potable water-operated AWL process for future commercialization.</p>","PeriodicalId":12796,"journal":{"name":"Greenhouse Gases: Science and Technology","volume":"15 2","pages":"178-196"},"PeriodicalIF":2.8,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ghg.2329","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143822254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Molecular Dynamics Insights Into the Phase Equilibria and Thermophysical Properties of CO2–H2S–Brine System During Acid Gas Sequestration in Saline Aquifers","authors":"Yasaman Hosseinzadeh Dehaghani,&nbsp;Mehdi Assareh,&nbsp;Farzaneh Feyzi","doi":"10.1002/ghg.2327","DOIUrl":"10.1002/ghg.2327","url":null,"abstract":"<div>\u0000 \u0000 <p>This work represents an extensive molecular dynamics (MDs) simulation study with the microstructural insight at the interface to simultaneously predict the phase equilibria, transport, and interfacial properties of the CO₂–H₂S–brine system within the range of temperatures 323.15–393.15 K, pressures up to 30 MPa, H₂S contents of 0–70 mol%, and salt molalities of 1–4 mol/kg, aiming to address the insufficiency of data under typical conditions of acid gas sequestration. The validation results demonstrate that the average absolute deviations (AAD%) for the predicted solubility of CO₂ and H₂S in water and in 2 mol/kg NaCl solution were found to be 5.45%, 6.34%, 5.78%, and 5.41%, respectively. Moreover, the AAD% for interfacial tension (IFT) and density were 6.74% and 3.70%, respectively, verifying the validity and performance of the applied force field parameters and computational methods. The simulation results indicated that H₂S solubility in brine is more sensitive to changes in the acid gas composition and temperature compared to CO₂ solubility. The presence of H₂S remarkably reduces the CO₂–H₂S–brine IFT, with the reduction degree depending on the H₂S content. Increasing the H₂S mole fraction in acid gas mixtures delays convective mixing by reducing the brine density. At about 64 mol% H₂S, the aqueous solution's density equals that of fresh brine, which is the highest H₂S content that can maintain the benefit of convective mixing in the dissolution trapping. The maximum acid gas column height that can be safely stored is most significant at lower temperature and H₂S content. On the basis of the results, pressure, temperature, and salt molality have a higher influence on the viscosity than density in the studied ranges. The new data generated by the current study can be utilized to develop predictive models of acid gas long-term behavior, which will reduce the uncertainty of real storage schemes.</p>\u0000 </div>","PeriodicalId":12796,"journal":{"name":"Greenhouse Gases: Science and Technology","volume":"15 2","pages":"154-177"},"PeriodicalIF":2.8,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143822125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Stress Distribution Characteristics Near Small Coal Faults and Prediction of Coal and Gas Outburst Risk","authors":"Lin Wang,&nbsp;Jiabin Liu,&nbsp;Xiangjun Chen,&nbsp;Hanxiao Guo,&nbsp;Shuailong Feng","doi":"10.1002/ghg.2331","DOIUrl":"10.1002/ghg.2331","url":null,"abstract":"<div>\u0000 \u0000 <p>This study aims to accurately predict the risk of coal and gas outbursts in coal seams located near small faults. Models of small-scale normal faults in the Changping mine field were constructed using the FLAC3D software, with fault dip angles of 65° and 70°, and drops of 1, 3, 5, 8, and 10 m. The objective was to analyze the effects of fault drop and dip angle on stress distribution near the faults and to predict the related outburst risks. The results indicate that in the hanging wall of the fault, the peak stress correlates with the fault drop through a linear function, whereas the range of influence is described by a quadratic function. As the fault drop increases, the impact range and stress peak also increase. The position of the stress peak gradually shifts away from the section, whereas the stress concentration area widens. Furthermore, the protruding danger zone expands and similarly moves farther from the section. When the fault drop is constant, the impact range of the 65° dip fault is smaller; however, the stress peak and the stress concentration zone in the nearby coal seam are larger and closer to the fault surface. Additionally, the highlighted danger zone is also larger and nearer to the fault surface. On the basis of the measured fundamental parameters of coal seam gas in the region, within a distance of 6 m from the fault surface (Zone I), there is a significant influence from the fault, resulting in a higher risk of outburst in this area. In the range of 6–15 m from the fault surface (Zone II), the gas content continues to increase, leading to an overall heightened risk of outburst.</p>\u0000 </div>","PeriodicalId":12796,"journal":{"name":"Greenhouse Gases: Science and Technology","volume":"15 2","pages":"142-153"},"PeriodicalIF":2.8,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143822066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Regional Resource Evaluation and Distribution for Onshore Carbon Dioxide Storage and Utilization in Uzbekistan","authors":"Azizbek Kamolov,&nbsp;Zafar Turakulov,&nbsp;Adham Norkobilov,&nbsp;Miroslav Variny,&nbsp;Marcos Fallanza","doi":"10.1002/ghg.2325","DOIUrl":"10.1002/ghg.2325","url":null,"abstract":"<div>\u0000 \u0000 <p>Addressing the escalating threat of climate change requires a global response, with significant actions from every nation. Uzbekistan, a member of the Paris Agreement, is actively pursuing sustainable development by reducing greenhouse gas emissions and promoting renewable energy. However, the country's Green Economy strategies currently lack Carbon Capture, Storage, and Utilization (CCUS) technology. A feasibility assessment is crucial to evaluating CCSU's potential for achieving net-zero emissions, benefiting both the public and scientific communities by informing policy decisions, and providing valuable data. The primary aim of this study is to evaluate Uzbekistan's potential for carbon dioxide (CO₂) storage and utilization (CSU) in the near and mid-term. To achieve this, this work proposes a methodology for efficient CO₂ source-sink matching to facilitate the deployment of CCUS technologies in Uzbekistan. Resource evaluation and spatial analysis methods are used to estimate the total CSU capacity of the region and the geographical distribution of CO₂ sources in two large-scale emitting sectors, specifically from the power and cement plants. According to the results, Uzbekistan has an annual CSU capacity of 1171 million tons CO₂, which is several times higher than the annual CO₂ emission rate. Additionally, CSU resources are primarily located in the eastern, western, and southern regions of the country, whereas CO₂ sink locations near the capital city and its surrounding areas are limited compared to their abundance of CO₂ sources. Overall, although the country has ample CO₂ storage capacity for CCUS deployment, the prospects for its chemical utilization remain limited in scale. © 2025 Society of Chemical Industry and John Wiley &amp; Sons, Ltd.</p>\u0000 </div>","PeriodicalId":12796,"journal":{"name":"Greenhouse Gases: Science and Technology","volume":"15 2","pages":"126-141"},"PeriodicalIF":2.8,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143822065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation and Performance of Menthol–Polyethylene Glycol LTTM in Carbon Dioxide Capture","authors":"Fatma R. Al-Fazari,&nbsp;Farouq S. Mjalli,&nbsp;Mehdi Shakourian-Fard,&nbsp;Ganesh Kamath,&nbsp;Jamil Naser,&nbsp;Ghulam Murshid,&nbsp;Suhaib Al Ma'awali","doi":"10.1002/ghg.2330","DOIUrl":"10.1002/ghg.2330","url":null,"abstract":"<div>\u0000 \u0000 <p>Carbon dioxide capture technology, while established, faces operational and economic challenges with current absorbents. Ionic liquids (ILs), though promising for their selectivity and low volatility, often have drawbacks like high toxicity and viscosity. This study explores nonionic low transition temperature mixtures (LTTMs) of menthol (MET) and polyethylene glycol 200 (PEG200) at various ratios for CO₂ uptake. The 1:2 molar ratio showed maximum CO₂ loading of 0.599 mol CO₂/mol solvent at 303.15 K and 1000 kPa, with water addition boosting CO₂ uptake by 25%. This rise in uptake with water could be due to altered hydrogen bonding within the mixture constituents. Molecular dynamics simulations support these findings, indicating experimental results, showing that water disrupts hydrogen bonds, exposing hydroxyl and ether sites for CO₂ interaction. This LTTM solvent system presents a promising, low-toxicity alternative for efficient CO₂ capture. © 2025 Society of Chemical Industry and John Wiley &amp; Sons, Ltd.</p>\u0000 </div>","PeriodicalId":12796,"journal":{"name":"Greenhouse Gases: Science and Technology","volume":"15 2","pages":"111-125"},"PeriodicalIF":2.8,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143822174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of Diverse Parameters on CO2 Adsorption in CO2 Sequestration: Utilizing a Novel Triaxial Testing Apparatus","authors":"Emad Ansari Ardehjani,&nbsp;Mohammad Ataei,&nbsp;Farhang Sereshki,&nbsp;Ali Mirzaghorbanali,&nbsp;Naj Aziz","doi":"10.1002/ghg.2322","DOIUrl":"10.1002/ghg.2322","url":null,"abstract":"<div>\u0000 \u0000 <p>In order to minimize greenhouse gas emissions, it is essential from an environmental point of view to employ CO₂ sequestration technology to store CO₂ in underground coal layers. To study this strategy, a triaxial testing apparatus is required. This study introduces a novel triaxial testing apparatus developed to explore enhanced coal bed methane (ECBM) and carbon dioxide (CO₂) sequestration techniques. Several laboratory tests were conducted to validate the apparatus and study the behavior of coal exposed to CO₂ using this machine. In fact, the implementation of this machine marks the initial step in an empirical feasibility analysis of CO₂ sequestration in Iranian coal seams. This analysis involves examining the impact of ash content, ambient temperature, and saturation direction on CO₂ adsorption and emission in various coal samples. Two different thermal coal samples from Chamestan and Tash mines were utilized. Some results, such as the trend of the coal sample's strain, show good correlation with previous work. Additionally, some results presented in this work are novel. On the basis of the results, the developed apparatus demonstrated satisfactory performance, and its innovative design fully meets the desired outcome. Higher ash content increases coal strength and reduces deformation. Lower ash content leads to more gas adsorption and deformation post-saturation. Gas adsorption is higher at 25°C than at 4°C. Moreover, coal samples at 25°C had 12.5 times more axial strain than those at 4°C. Lateral saturation causes 13.72% larger axial strain changes than top and end saturation due to increased gas-sample contact and penetration into the coal matrix.</p>\u0000 </div>","PeriodicalId":12796,"journal":{"name":"Greenhouse Gases: Science and Technology","volume":"15 1","pages":"53-67"},"PeriodicalIF":2.8,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143381066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research Progress on CO2 Geological Storage Reservoir and Caprock Mechanics: Methods and Status","authors":"Shuaiyi Lu,&nbsp;Pan Jiang,&nbsp;Lianghan Cong,&nbsp;Xiaoshu Lü","doi":"10.1002/ghg.2328","DOIUrl":"10.1002/ghg.2328","url":null,"abstract":"<div>\u0000 \u0000 <p>Greenhouse gas (GHG) emissions have caused serious global climate change, and countries worldwide are taking steps to mitigate the greenhouse effect caused by carbon emissions. CO₂ geological storage (CGS) is emerging as a large-scale technology for reducing GHG emissions and is gradually becoming one of the most important means of mitigating the greenhouse effect. There are several problems in the implementation of this technology, among which the geomechanical problems caused by injection sequestration cannot be ignored. This article reviews the impacts and hazards of geomechanical problems caused by injection and sequestration in CGS, which can lead to risks, including changes in reservoir and caprock mechanical properties, reservoir stability, caprock closure, fault activation, and induced seismicity during CO₂ injection and sequestration. This article reviews the above studies and summarizes the research methods of CGS geomechanical problems and generation mechanisms, which can help to comprehensively understand the risks faced in the CGS process and provide references and guidance for the operation, monitoring, and research of CGS in the future.</p>\u0000 </div>","PeriodicalId":12796,"journal":{"name":"Greenhouse Gases: Science and Technology","volume":"15 2","pages":"264-276"},"PeriodicalIF":2.8,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143822198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nickel Aluminum Spinel Derived Ni-F-Al Active Site for the Catalytic Dehydrofluorination of Potent Greenhouse Gas 1,1,1,2-Tetrafluoroethane","authors":"Fangcao Liu,&nbsp;Bing Liu,&nbsp;Yiwei Sun,&nbsp;Jinru Liu,&nbsp;Yubao Bi,&nbsp;Jiaming Zhao,&nbsp;Xiaoli Wei,&nbsp;Wenfeng Han","doi":"10.1002/ghg.2324","DOIUrl":"10.1002/ghg.2324","url":null,"abstract":"<div>\u0000 \u0000 <p>HFC-134a (1,1,1,2-tetrafluoroethane) is one of the most common refrigerants with global warming potential (100 years) of 1300. It is regulated to be phased out gradually according to the Kigali Amendment to the Montreal Protocol. Treatment of this stable chemical poses significant challenge. Highly efficient nickel aluminum spinel catalysts were fabricated by sol–gel method for the catalytic dehydrofluorination of HFC-134a. The effect of Ni/Al ratio in the NiAl₂O₄ spinel precursors on the performance of NiAl catalysts was studied by x-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), scanning electron microscope (SEM), transmission electron microscopy (TEM), NH₃-TPD, and XPS. Nickel–aluminum ratio in the nickel–aluminum spinel precursor plays a major role on the formation of strong acid and active species Ni-F-Al. With Ni/Al ratio of 4, the (3 1 1) crystal face of NiAl₂O₄ interfaced with the (1 1 1) crystal face of NiO and the (4 0 0) crystal face of NiAl₂O₄. This interaction facilitates the formation of Ni-F-Al active species following the dehydrofluorination reaction. Furthermore, the Ni-F-Al species altered the acid structure of NiAl catalysts. It was found that NiAl catalyst with a Ni/Al ratio of 4 has the best catalytic performance compared with other catalysts (with conversion of 35%), and no deactivation trend was observed after 50 h of time on stream. (Reaction conditions: N₂/CF₃CH₂F = 10, T = 450°C, GHSV = 660 h⁻¹).</p>\u0000 </div>","PeriodicalId":12796,"journal":{"name":"Greenhouse Gases: Science and Technology","volume":"15 1","pages":"68-78"},"PeriodicalIF":2.8,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143380938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}