Walid Abdelfattah , Munthar Kadhim Abosaoda , Dharmesh Sur , Menon Soumya V , Prabhat Kumar Sahu , Kamred Udham Singh , R. Sivaranjani , Rohit Chauhan , Siya Singla , Fereydoon Ranjbar
{"title":"Robust machine learning models for calculating the carbon dioxide desublimation point within natural gas mixtures at low temperature conditions","authors":"Walid Abdelfattah , Munthar Kadhim Abosaoda , Dharmesh Sur , Menon Soumya V , Prabhat Kumar Sahu , Kamred Udham Singh , R. Sivaranjani , Rohit Chauhan , Siya Singla , Fereydoon Ranjbar","doi":"10.1016/j.jcou.2025.103150","DOIUrl":"10.1016/j.jcou.2025.103150","url":null,"abstract":"<div><div>Desublimation at low temperatures offers an efficient method for removing CO<sub>2</sub> from gas streams. Accurate prediction of the carbon dioxide desublimation temperature (CDDT) is essential for applying this method in natural gas processing. This investigation aimed to develop predictive tools utilizing machine learning approaches to estimate CDDT within natural gas mixtures. To reach this target, a large data set comprising 430 measurements obtained from published sources, was prepared. These data points cover the CDDT in binary and ternary natural gas mixtures under different pressures and gas fractions. In addition to black-box tools such as Decision Tree (DT), Gaussian Process Method (GPM) and Adaptive Neuro-Fuzzy Inference System (ANFIS) methods, a mathematical equation was developed via Genetic Programming (GP) technique for CDDT calculation. The performances of the designed models were rigorously evaluated through various visual inspections and statistical indices. While all models demonstrated excellent predictive accuracy, the GPM model provided superior results among black-box tools, exhibiting a mean absolute percentage error (MAPE) of 0.99 %. Furthermore, the GP equation achieved an overall MAPE of 0.65 % for the CDDT data. The intelligent models also performed well in predicting the data pertinent to both binary and ternary mixtures. A series of simulations based on the models’ outcomes were carried out to depict the CDDT variations in response to operational parameters, and the findings showed full consistency with previous experimental results. Ultimately, a sensitivity analysis was conducted to pinpoint the dominant factors affecting the CO<sub>2</sub> desublimation. Overall, the outcomes of this research enhance the understanding of CDDT behavior and provide valuable information for optimizing low-temperature CO<sub>2</sub> capture processes used in natural gas purification.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"99 ","pages":"Article 103150"},"PeriodicalIF":7.2,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144312846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
L. Martínez Quintana , T.H. Vuong , Abdallah I.M. Rabee , J. Rabeah , A.B. Dongil
{"title":"Effect of Ba and Mg as promoter on Ru/g-C3N4 catalyst for CO2 methanation","authors":"L. Martínez Quintana , T.H. Vuong , Abdallah I.M. Rabee , J. Rabeah , A.B. Dongil","doi":"10.1016/j.jcou.2025.103158","DOIUrl":"10.1016/j.jcou.2025.103158","url":null,"abstract":"<div><div>Catalytic hydrogenation of CO₂ to produce value-added hydrocarbons is a promising strategy for reducing greenhouse gas emissions and producing renewable fuels and chemicals. In this study, Ru- g-C₃N₄ catalysts were modified with barium (Ba) and magnesium (Mg) promoters to improve the conversion efficiency of CO₂ and tune the products selectivity of the Ru/g-C₃N₄ catalysts. Two different synthetic approaches were used; namely, co-impregnation with Ru and pre-incorporation of Ba or Mg into the g-C<sub>3</sub>N<sub>4</sub> lattice prior to Ru loading. The study revealed that Ba modification significantly improved the catalyst's performance, resulting in higher CO₂ conversion rates and the selective formation of CH₄. This enhancement is attributed to the electronic and structural modifications induced by doping Ba into the g-C<sub>3</sub>N<sub>4</sub> lattice that facilitate CO₂ activation and hydrogenation. In contrast, adding Ba via co-impregnation partially covered Ru sites, promoting CO formation by stabilizing isolated Ru sites and small clusters, as confirmed by in-situ CO adsorption studies. Conversely, Mg had a negative effect, likely due to more pronounced coverage of Ru active sites, which suppressed catalytic performance. These findings emphasise the importance of selecting suitable promoters to optimise CO₂ hydrogenation catalysts, with Ba-doped Ru/g-C₃N₄ emerging as an effective system for methane synthesis.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"99 ","pages":"Article 103158"},"PeriodicalIF":7.2,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144322798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Youngjin Doh , Junwon Oh , Sengwoo Kim , Wonhee Lee , Ki Tae Park
{"title":"Flooding-resistant gas diffusion electrode design for MEA-type CO2 electrolyzer","authors":"Youngjin Doh , Junwon Oh , Sengwoo Kim , Wonhee Lee , Ki Tae Park","doi":"10.1016/j.jcou.2025.103155","DOIUrl":"10.1016/j.jcou.2025.103155","url":null,"abstract":"<div><div>The electrocatalytic CO<sub>2</sub> reduction reaction (CO<sub>2</sub>RR) powered by renewable electricity offers a sustainable pathway for converting CO<sub>2</sub> into valuable products, presenting a promising strategy to mitigate atmospheric CO<sub>2</sub> concentrations. The design of gas diffusion electrodes (GDEs) plays a crucial role in enhancing the CO<sub>2</sub>RR performance and stability in membrane-electrode assembly (MEA)-type electrolyzers. One of the primary challenges in industrializing CO<sub>2</sub>RR technologies is the flooding of GDEs, which significantly reduces the stability of CO<sub>2</sub>RR performance. Here, we design a flooding-resistant GDE by incorporation of macrochannels into GDE employing a nickel (Ni) foam substrate to mitigate GDE flooding and improve CO<sub>2</sub>RR performance and stability. The macrochannels in Ni foam-based GDE ensure sufficient mass transfer of CO<sub>2</sub> to the catalyst layer and the discharge of electrolyte, thereby minimizing the GDE flooding. The Ni foam based-GDE exhibits significantly higher through-plane conductivity and gas permeability compared to conventional carbon paper-based GDEs and retains hydrophobicity even after prolonged operation. This GDE demonstrates higher CO current density (<em>j</em><sub>CO</sub>) and lower cell voltage, maintaining excellent stability with a high CO Faradaic efficiency (FE<sub>CO</sub>) of 88.4 % over 50 h of continuous operation. These findings emphasize the importance of GDE designs with enhanced mass transfer capabilities to effectively address flooding challenges and improve the efficiency of CO<sub>2</sub>RR in MEA-type electrolyzers.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"98 ","pages":"Article 103155"},"PeriodicalIF":7.2,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144307273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zhanlin Shi , Guoqun Zhao , Lei Zhang , Guilong Wang , Wenli Li , Zhiping Chen
{"title":"Green construction of highly tunable micro-nano porous polymers based on polymethylmethacrylate /polyvinylidene fluoride self-assembly system and ultra-low pressure CO2 foaming","authors":"Zhanlin Shi , Guoqun Zhao , Lei Zhang , Guilong Wang , Wenli Li , Zhiping Chen","doi":"10.1016/j.jcou.2025.103156","DOIUrl":"10.1016/j.jcou.2025.103156","url":null,"abstract":"<div><div>The green construction of micro-nano porous polymers with great potential still faces extreme challenges, including polluting solution blending processes, the use of exogenous nucleating agents, high saturation pressure and even chlorofluorocarbon foaming gas. It is urgent to establish a cleaner and flexible method for managing the nucleation and growth of cells. Hence, a novel approach for manufacturing micro-nano porous polymers via ultra-low pressure CO<sub>2</sub> foaming of polymethylmethacrylate (PMMA)/polyvinylidene fluoride (PVDF) blends was proposed in this work. In this approach, the self-assembly behavior of PVDF macromolecular chains was manipulated through CO<sub>2</sub> absorption process to dominate cell nucleation and regulate cell growth. It was found that as the absorption pressure increases, the phase morphology of PVDF changes from amorphous particles to bundle-like crystals. As the PVDF content increases, it transitions from groove-like microcrystals to bundle-like crystals, and finally to granular crystals. The self-assembled PVDF microphase can reduce the nucleation barrier and significantly increase the nucleation density. Furthermore, the miscible PVDF prolongs the cell growth and effectively increases the expansion ratio through plasticization. By this method, porous polymers with both small cell size and high expansion ratio can be obtained. Moreover, highly expanded microporous polymers with an expansion ratio of 25.6 can also be prepared under ultra-low pressure of 1.7 MPa. These findings provide a new route for green construction of highly tunable micro-nano porous polymers.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"98 ","pages":"Article 103156"},"PeriodicalIF":7.2,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144307272","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"CO2 conversion into formic acid with CO-containing hydrogen gas over a heterogenized Ru catalyst","authors":"Hongjin Park, Seokyeong Moon, Sungho Yoon","doi":"10.1016/j.jcou.2025.103154","DOIUrl":"10.1016/j.jcou.2025.103154","url":null,"abstract":"<div><div>To achieve cost-competitive CO<sub>2</sub> hydrogenation processes, it is desirable to utilize gray hydrogen, which typically contains 1–3 mol% CO. However, previously reported catalysts have been severely affected by CO poisoning, leading to metal aggregation, active site leaching, and structural deactivation. The CO tolerance test of Ru-MACHO-POMP (porous organometallic polymer) confirmed that the catalyst maintained activity during CO<sub>2</sub> hydrogenation to formic acid even under high CO concentrations (12.5 mol%). Through various characterization methods analyzing catalytic active sites, it was found that the catalytic activity was reversibly restored due to reversible binding of CO to Ru active sites, enabling the regeneration of the original active structure. These findings highlight Ru-MACHO-POMP as a sustainable and economically viable catalyst for industrial CO<sub>2</sub> hydrogenation processes.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"98 ","pages":"Article 103154"},"PeriodicalIF":7.2,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144307105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zhongqi Zhang , Yingjie Shen , Aosen Zhang , Yuan Zhai , Ziqing Wang , Kun Jiang , Heyun Wang
{"title":"Preparation of imidazole ligand zirconium-based UiO-66 and its application in the direct synthesis of dimethyl carbonate from CO2 and methanol","authors":"Zhongqi Zhang , Yingjie Shen , Aosen Zhang , Yuan Zhai , Ziqing Wang , Kun Jiang , Heyun Wang","doi":"10.1016/j.jcou.2025.103148","DOIUrl":"10.1016/j.jcou.2025.103148","url":null,"abstract":"<div><div>In this study, imidazole carboxylate was introduced into the structure of UiO-66 as a secondary ligand. Subsequently, a novel imidazole ligand zirconium-based UiO-66-Im-<em>X</em> material was prepared, which was used to catalyze the direct synthesis of dimethyl carbonate (DMC) from carbon dioxide (CO<sub>2</sub>) and methanol. The influence of imidazole carboxylate content on the physicochemical properties and catalytic performance of the UiO-66-Im-<em>X</em> catalyst was studied. The results showed the addition of imidazole carboxylate increased the number of ligand defects in the Zr<sub>6</sub> formula unit, which significantly enhanced the α-acidic sites of the UiO-66-Im-<em>X</em> catalyst. UiO-66-Im-0.2 with a good crystal structure exhibited the highest surface area, pore volume, and acidic sites and demonstrated the best catalytic activity. At 3.5 MPa, 140 °C, and a reaction time of 8 h, the DMC yield reached 0.9335 %. In addition, the catalytic effect of UiO-66-Im-0.2 exceeded 90 % after four recycling iterations, demonstrating excellent reusability. The in-situ infrared spectroscopy results and density functional theory (DFT) calculations demonstrated that the incorporation of the imidazole ring significantly enhanced the adsorption capacity of CO<sub>2</sub> molecules and reduced its adsorption energy on the UiO-66-Im-0.2 catalyst.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"98 ","pages":"Article 103148"},"PeriodicalIF":7.2,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144291275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Tuning the hydrogenation of CO2 to lower olefins: Impact of Pt in K–doped Fe–Mn catalysts","authors":"Tomohiro Hojo , Tomohiro Yabe , Kazuya Yamaguchi","doi":"10.1016/j.jcou.2025.103153","DOIUrl":"10.1016/j.jcou.2025.103153","url":null,"abstract":"<div><div>Fe-based catalysts are promising for the hydrogenation of CO<sub>2</sub> to olefins, contributing to the mitigation of CO<sub>2</sub> emissions. Low-pressure conditions (∼1 MPa) are preferred for the selective synthesis of lower olefin because these conditions suppress carbon chain growth and olefin re-absorption which leads to hydrogenation of olefins to paraffins. In this study, K-doped Fe–Mn–Pt/Al<sub>2</sub>O<sub>3</sub> catalysts that could react at 1 MPa were prepared, with a focus on the role and position of Pt active sites. K–Fe<sub>17</sub>Mn<sub>2</sub>/Pt<sub>1</sub>/Al<sub>2</sub>O<sub>3</sub> was prepared by first supporting Pt on Al<sub>2</sub>O<sub>3</sub> followed by Fe–Mn oxide; it exhibited the highest C<sub>2–5</sub> olefin selectivity of 28 %. Pt promoted the reverse water-gas shift reaction, and in combination with Mn, facilitated iron oxide reduction and Fe<sub>5</sub>C<sub>2</sub> formation, enhancing the C<sub>2–5</sub> olefin selectivity. Compared with the Pt active sites in K–Pt<sub>1</sub>/Fe<sub>17</sub>Mn<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub>, which was prepared by first supporting Fe–Mn oxide on Al<sub>2</sub>O<sub>3</sub> followed by Pt, those in K–Fe<sub>17</sub>Mn<sub>2</sub>/Pt<sub>1</sub>/Al<sub>2</sub>O<sub>3</sub> existed around the Fe–Mn active sites. Pt continued to contribute to the Fe species reduction and the stable supply of CO, leading to improved C<sub>2–5</sub> olefin selectivity.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"98 ","pages":"Article 103153"},"PeriodicalIF":7.2,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144291276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Luke Lanham , Alistair McTaggart , James R. Falconer
{"title":"Is there mush-room to improve the environmental sustainability of psilocybin production?","authors":"Luke Lanham , Alistair McTaggart , James R. Falconer","doi":"10.1016/j.jcou.2025.103137","DOIUrl":"10.1016/j.jcou.2025.103137","url":null,"abstract":"<div><div>Mental health disorders and associated economic impact continue to rise domestically and globally. In 2023, to expand treatment options for individuals suffering Treatment Resistant Depression (TRD), the Therapeutic Goods Administration (TGA) of Australia has permitted psychiatrist lead psilocybin-assisted psychotherapy. Psilocybin, a psychedelic tryptamine found naturally in psychedelic mushrooms is presently synthesised, for clinical use, through synthetic or chemoenzymatic methods. Unfortunately, the synthesis-based methods are limited by low production yields, high material costs, multiple steps, and laborious in-process controls. Use of neoteric (“new”) solvents, such as supercritical carbon dioxide (scCO<sub>2</sub>) offers an environmentally sustainable alternative to synthetic techniques. Favoured for its selective extraction, low supercritical process parameters (31.7°C and 72 bar), high permeability through plant matrices, and a lack of post-extraction residues, supercritical carbon dioxide (scCO<sub>2</sub>) presents a promising option for extracting novel psychedelic tryptamines from the fungi biomass. Presently, no publications demonstrate the use of scCO<sub>2</sub> in the extraction of psychedelic tryptamines from any plant biomass. Herein, to better understand the plausibility and need of alternative psilocybin supply pathways, the current synthetic, biosynthetic and chemoenzymatic production options are reviewed and compared to the possibility of scCO<sub>2</sub> extraction from the fungi biomass as a viable, environmentally conscious alternative. Additionally, a brief overview of psychedelic mushrooms and the medicinal importance of their psychedelic tryptamines is provided.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"98 ","pages":"Article 103137"},"PeriodicalIF":7.2,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144253745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Oxygenate-mediated catalysis for CO2 hydrogenation: A sustainable path to light olefins","authors":"Fatemeh Biabangard, Jafar Towfighi Darian, Masoud Safari Yazd","doi":"10.1016/j.jcou.2025.103149","DOIUrl":"10.1016/j.jcou.2025.103149","url":null,"abstract":"<div><div>The hydrogenation of CO<sub>2</sub> to light olefins using renewable hydrogen presents a promising strategy for mitigating greenhouse gas emissions and addressing the growing demand for sustainable industrial chemicals. This review focuses on the oxygenate-mediated species involved in the CO<sub>2</sub> conversion route, a highly selective and efficient alternative to traditional Fischer-Tropsch synthesis. Central to this process are bifunctional catalysts, which integrate metal oxides for CO<sub>2</sub> activation and zeolites for hydrocarbon formation, enabling tandem catalysis. Key catalyst components, such as ZnO, Cu, ZrO<sub>2</sub>, and In<sub>2</sub>O<sub>3</sub>, play critical roles in CO<sub>2</sub> adsorption, stabilization of intermediates like methanol, methoxy, and ketene, and their subsequent conversion into light olefins via distinct pathways, including the ketene, formate, and dimethyl ether (DME) routes. Advances in catalyst design, encompassing morphology, active site proximity, and surface modification, alongside the optimization of operating conditions such as temperature, pressure, and space velocity, have significantly enhanced catalytic efficiency and product selectivity. Furthermore, innovations in zeolite frameworks like SAPO-34, with their shape-selective properties, have contributed to minimizing by-products and maximizing olefin yield. This comprehensive analysis provides insights into the factors influencing catalytic performance, emphasizing the need for interdisciplinary research to overcome challenges such as catalyst deactivation and scalability. By integrating advanced catalyst designs with optimized process parameters, this study outlines a roadmap for sustainable CO<sub>2</sub>-to-olefin conversion, contributing to environmental protection and a circular carbon economy.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"98 ","pages":"Article 103149"},"PeriodicalIF":7.2,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144239328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K.C. Pájaro , R. de Antonio , A. Martínez-Arias , V. Cortés Corberán
{"title":"Catalytic performance and regenerability of Ni/CeZrSmOx catalysts for dry reforming of methane","authors":"K.C. Pájaro , R. de Antonio , A. Martínez-Arias , V. Cortés Corberán","doi":"10.1016/j.jcou.2025.103146","DOIUrl":"10.1016/j.jcou.2025.103146","url":null,"abstract":"<div><div>The effect of zirconium and samarium as promoters and dopants of Ni/CeO<sub>2</sub> catalysts for dry reforming of methane (DRM) has been investigated. The catalysts were prepared by coprecipitation within inverse microemulsions, which allow achieving good structural homogeneity and surface area. They were characterized using nitrogen adsorption-desorption isotherms, X-ray diffraction (XRD), temperature programmed reduction (TPR), temperature programmed oxidation (TPO), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The catalysts, preactivated in a flow of 10 % O<sub>2</sub>/He and further under the reactant stream, have been tested in DRM, using samples both fresh and upon regeneration after their first use at 700 ºC for 5 h at atmospheric pressure. The effect of spatial velocity has been also investigated. Different catalytic properties are revealed as a function of the nature of the support in each case. While the undoped Ni-Ce catalyst exhibits high DRM activity, its deactivation is shown to depend on the spatial velocity applied, and a relatively high stability is observed at high contact time. While all systems suffer deactivation caused by the formation of carbon deposits as well as sintering of the nickel and support, the presence of zirconium is shown to provide a higher stability to the systems as a consequence of enhanced redox properties and lower nickel size, which can limit deactivation by carbon deposits. In contrast, a relatively higher deactivation due to carbon deposits is observed upon doping with samarium.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"98 ","pages":"Article 103146"},"PeriodicalIF":7.2,"publicationDate":"2025-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144231349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}