Journal of CO2 Utilization最新文献_第4页

Comparison and reliability assessment of CO2 quantification methods for carbonated cementitious materials 碳酸化胶凝材料CO2定量方法的比较与可靠性评估

IF 7.2 2区工程技术

Journal of CO2 Utilization Pub Date : 2025-05-31 DOI: 10.1016/j.jcou.2025.103140

Katsuya Namiki , Kazuya Yamashita , Kazuto Tabara , Suguru Noda

{"title":"Comparison and reliability assessment of CO2 quantification methods for carbonated cementitious materials","authors":"Katsuya Namiki , Kazuya Yamashita , Kazuto Tabara , Suguru Noda","doi":"10.1016/j.jcou.2025.103140","DOIUrl":"10.1016/j.jcou.2025.103140","url":null,"abstract":"<div><div>Various CO<sub>2</sub>-absorbing concretes have been developed; however, an accurate assessment of their CO<sub>2</sub> content is critically important. CO<sub>2</sub> has been quantified by releasing it from concrete and measuring the sample mass loss and/or the released CO<sub>2</sub>; however, the differences between these methods remain unexplored. In this study, cementitious materials were carbonated and evaluated using five analysis methods. The presence of free water in the samples and moisture adsorption significantly affected the sample mass. Therefore, all the samples were ground and dried by heating in vacuum before analysis. Heating above 980 °C or immersion in HCl was effective for CO<sub>2</sub> release, and non-dispersive infrared spectroscopy and coulometric titration were effective for quantifying released CO<sub>2</sub>, with measurement variance within ± 5 %. However, CO<sub>2</sub> release using H<sub>3</sub>PO<sub>4</sub> was insufficient, leading to an underestimation of up to 12 %. The combination of temperature-programmed desorption and non-dispersive infrared spectroscopy had the best reproducibility among the five methods and clearly showed that CO<sub>2</sub> and H<sub>2</sub>O were released simultaneously at the moderate temperature range. This overlap causes difficulties in the popular thermogravimetric analysis which attributes the mass change below/above a threshold temperature to H<sub>2</sub>O/CO<sub>2</sub>, respectively. CO<sub>2</sub> contents were underestimated due to the unaccounted CO<sub>2</sub>-derived mass loss for CO<sub>2</sub>-rich samples and/or high threshold temperatures while overestimated due to misincluded H<sub>2</sub>O-derived mass loss for H<sub>2</sub>O-rich samples and/or low threshold temperatures. This study presents a highly reliable approach for assessing CO<sub>2</sub> fixation, which is essential for calculating the carbon footprints of various cementitious materials and concrete.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"97 ","pages":"Article 103140"},"PeriodicalIF":7.2,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144185446","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}

引用次数: 0

Evaluation of single chamber electrochemical reduction of CO2 to formate for application under biocompatible conditions 评价生物相容性条件下单室电化学还原CO2生成甲酸的应用

IF 7.2 2区工程技术

Journal of CO2 Utilization Pub Date : 2025-05-30 DOI: 10.1016/j.jcou.2025.103136

Zainab Ul , Mira Sulonen , Philip Haus , Paniz Izadi , Juan Antonio Baeza , Falk Harnisch , Albert Guisasola

{"title":"Evaluation of single chamber electrochemical reduction of CO2 to formate for application under biocompatible conditions","authors":"Zainab Ul , Mira Sulonen , Philip Haus , Paniz Izadi , Juan Antonio Baeza , Falk Harnisch , Albert Guisasola","doi":"10.1016/j.jcou.2025.103136","DOIUrl":"10.1016/j.jcou.2025.103136","url":null,"abstract":"<div><div>The electrochemical CO<sub>2</sub> reduction reaction (eCO<sub>2</sub>RR) facilitates high rates and yields for the selective production of formate, a quintessential C1-compound that can serve as a valuable carbon and energy source for biosynthesis. The use of double-chamber (DC) electrochemical cells with membranes is deemed essential to avoid mixing of electrochemical products (i.e. anodic oxygen and cathodic formate) and thus cross-reactions that lower yields, Faradaic efficiency (FE) and effective rate. However, single-chamber (SC) setups for eCO<sub>2</sub>RR can be more suitable to combine with bioprocesses. This work comprehensively evaluates, using different experimental set-ups, the conditions under which SC operation can obtain results comparable to DC systems. At a 50 mL scale, under biocompatible conditions, formate production in the SC setup achieved a 14 % reduction in the production rate (146 mg L<sup>−1</sup> h<sup>−1</sup> for SC and 170 mg L<sup>−1</sup> h<sup>−1</sup> for DC) and a 15 % decrease in FE (72.2 % in SC and 84.7 % in DC). The highest formate concentration produced in 24 h SC experiments was 1.8 g·L<sup>−1</sup> with FE of 41 %, a concentration appropriate for fermentation processes. The SC operation of eCO<sub>2</sub>RR to formate without a membrane could reduce energy losses and capital costs, although at the cost of an expected reduction in rate and FE.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"97 ","pages":"Article 103136"},"PeriodicalIF":7.2,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144170540","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}

引用次数: 0

Polyethylenimine-functionalized SBA-15 mesoporous silica for CO2 direct air capture and conversion to methane in a coupled catalytic reactor 聚乙烯亚胺功能化SBA-15介孔二氧化硅在耦合催化反应器中的CO2直接空气捕获和转化为甲烷

IF 7.2 2区工程技术

Journal of CO2 Utilization Pub Date : 2025-05-29 DOI: 10.1016/j.jcou.2025.103134

Iñigo Lacarra-Etxarri, Unai De La Torre, José A. González-Marcos, Juan R. González-Velasco, Beñat Pereda-Ayo

{"title":"Polyethylenimine-functionalized SBA-15 mesoporous silica for CO2 direct air capture and conversion to methane in a coupled catalytic reactor","authors":"Iñigo Lacarra-Etxarri, Unai De La Torre, José A. González-Marcos, Juan R. González-Velasco, Beñat Pereda-Ayo","doi":"10.1016/j.jcou.2025.103134","DOIUrl":"10.1016/j.jcou.2025.103134","url":null,"abstract":"<div><div>Technologies that capture and store or utilize CO<sub>2</sub> have the potential to reduce the concentration of this gas in the atmosphere or provide carbon-neutral energy vectors. In this work, materials based on mesoporous silica SBA-15 functionalized with different polyethylenimine (PEI) loadings, i.e. 30, 40 and 50 wt% were synthesized. The 50 wt% PEI/SBA-15 sample exhibited the highest CO<sub>2</sub> capture capacity of 6.0 g CO<sub>2</sub>/100 g when exposed to 400 ppm CO<sub>2</sub>. The sorption performance in a capture unit feeding 420 ppm of CO<sub>2</sub> showed negligible influence of the inclusion of 21 % oxygen, whereas 64 % humidity enhanced by 17 % the CO<sub>2</sub> sorption capacity with respect to a dry feeding at 20 °C. Desorption of H<sub>2</sub>O preceded CO<sub>2</sub> during temperature swing at 80 °C, revealing a stronger interaction of CO<sub>2</sub> with the sorbent. Finally, experiments were conducted by coupling the capture unit with a downstream catalytic reactor loaded with 10 % Ni/Al<sub>2</sub>O<sub>3</sub> catalyst. A gas stream composed of 420 ppm CO<sub>2</sub>, 21 % O<sub>2</sub> and 64 % humidity was admitted to the capture unit working at 20 °C. The CO<sub>2</sub> captured under direct air capture (DAC) conditions was desorbed in a 1 % H<sub>2</sub>/N<sub>2</sub> gas stream by temperature swing at 80 °C. The desorption of H<sub>2</sub>O along with CO<sub>2</sub> impeded the conversion of CO<sub>2</sub> into CH<sub>4</sub> in the reaction unit. The inclusion of an isothermal step at 45 °C during temperature swing allowed to decouple CO<sub>2</sub> and H<sub>2</sub>O desorption, achieving a CO<sub>2</sub> conversion of 80.4 % with a CH<sub>4</sub> selectivity of 97.6 %.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"97 ","pages":"Article 103134"},"PeriodicalIF":7.2,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144170539","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}

引用次数: 0

Investigation of the performance and stability of copper and brass nanoparticles for CO2 reduction in organic electrolytes 铜和黄铜纳米颗粒用于有机电解质中CO2还原的性能和稳定性研究

IF 7.2 2区工程技术

Journal of CO2 Utilization Pub Date : 2025-05-28 DOI: 10.1016/j.jcou.2025.103138

Ruth Witzel , Leonie Wildersinn , Enrico Tusini , Steffen Czioska , Inga Dorner , Anna Zimina , Jan-Dierk Grunwaldt , Philipp Röse

{"title":"Investigation of the performance and stability of copper and brass nanoparticles for CO2 reduction in organic electrolytes","authors":"Ruth Witzel , Leonie Wildersinn , Enrico Tusini , Steffen Czioska , Inga Dorner , Anna Zimina , Jan-Dierk Grunwaldt , Philipp Röse","doi":"10.1016/j.jcou.2025.103138","DOIUrl":"10.1016/j.jcou.2025.103138","url":null,"abstract":"<div><div>Numerous catalysts and reaction conditions with improved performance, selectivity, and stability for the electrochemical CO<sub>2</sub> reduction reaction have been reported. However, little is known about the influence of binary catalysts and their role on this reaction in organic electrolytes. Thus, we herein report on the catalyst characteristics of copper and copper-zinc nanoparticles for CO<sub>2</sub> reduction in aprotic electrolytes. We provide insights into the impact of varying CuZn ratios on the performance and stability, showing that brass in the α-phase has lower overpotentials and a higher electrochemical activity, with an optimum for CuZn 80/20. Although using the same catalyst, we compared acetonitrile and <em>N</em>,<em>N</em>-dimethylformamide based electrolytes, and found the highest performance for acetonitrile. Under anhydrous conditions, absolute control of Faradaic efficiency is possible, resulting in > 95 % CO; only traces of oxalate and no parasitic hydrogen evolution were found. Our study reveals that aside from proper process conditions for CO<sub>2</sub> reduction in organic electrolytes, the design of the catalysts plays an equally decisive role for improved performance, selectivity and stability.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"97 ","pages":"Article 103138"},"PeriodicalIF":7.2,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144170595","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}

引用次数: 0

Enhancement of ethanol production using CO2 and CO gases in a continuous fixed-film bioreactor 在连续固定膜生物反应器中利用CO2和CO气体提高乙醇生产

IF 7.2 2区工程技术

Journal of CO2 Utilization Pub Date : 2025-05-26 DOI: 10.1016/j.jcou.2025.103133

Siraporn Potivichayanon , Prayad Pokethitiyook , Rattana Toensakes

{"title":"Enhancement of ethanol production using CO2 and CO gases in a continuous fixed-film bioreactor","authors":"Siraporn Potivichayanon , Prayad Pokethitiyook , Rattana Toensakes","doi":"10.1016/j.jcou.2025.103133","DOIUrl":"10.1016/j.jcou.2025.103133","url":null,"abstract":"<div><div>Ethanol-producing bacteria play an essential role in enhancing bioethanol production efficiency. This study aimed to develop an application of <em>Petrobacter</em> sp. SUTSP5, an ethanol-producing bacterium, from carbon-rich gas by using a fixed-film ethanol bioreactor called FEthaRex to enhance ethanol production efficiency.</div><div>The fixed-film consortium was initially grown in a combination nutrient with a carbon-rich gas composed of 15:25:40 (by volume) CO<sub>2</sub>:CO:H<sub>2</sub> and supplied to the FEthaRex column at an average flow rate of 100 mL/min. Nutritional liquid medium was circulated at a flow rate of 20 mL/min. The system achieved an ethanol production rate of approximately 0.1305 g/L/h within 24 h, which increased significantly to 0.1780 g/L/h after a 48-h operation period; the ethanol production rate increased from 0.1585–0.2132 g/L/h as the gas composition increased to 30:50:20 (by volume); continuous operation of the FEthaRex system was achieved after mixed gas feeding was stopped; and the maximum ethanol concentration observed after 48 h was 1.9860 g/L/h, or 6.0411 % by volume, with the ethanol-producing cells reaching a count of approximately 10<sup>7</sup> CFU/mL and average biofilm cell attached to packing media roughly 0.0058 g. At these optimum conditions, which achieved an ethanol yield higher than that of a free suspended cell reactor (EthaRex) with the same gas feed conditions. The FEthaRex system was demonstrated as a promising approach to achieving cell density and stability in the microbial community. This technology could be an efficient tool for enhancing sustainable bioethanol production.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"97 ","pages":"Article 103133"},"PeriodicalIF":7.2,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144134845","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}

引用次数: 0

Gas heating and plasma chemistry in low-pressure CO2 plasmas 低压CO2等离子体中的气体加热和等离子体化学

IF 7.2 2区工程技术

Journal of CO2 Utilization Pub Date : 2025-05-26 DOI: 10.1016/j.jcou.2025.103128

Yang Liu , Tiago Silva , Tiago C. Dias , Pedro Viegas , Xiangen Zhao , Yaping Du , Junjia He , Vasco Guerra

{"title":"Gas heating and plasma chemistry in low-pressure CO2 plasmas","authors":"Yang Liu , Tiago Silva , Tiago C. Dias , Pedro Viegas , Xiangen Zhao , Yaping Du , Junjia He , Vasco Guerra","doi":"10.1016/j.jcou.2025.103128","DOIUrl":"10.1016/j.jcou.2025.103128","url":null,"abstract":"<div><div>We develop a self-consistent kinetic model to simulate the evolution of species and energy transfers in low-pressure CO<sub>2</sub> plasmas. This model couples the electron, vibrational and chemical kinetics with the gas thermal balance equation, providing a comprehensive framework for understanding CO<sub>2</sub> plasmas. The kinetic model is thoroughly benchmarked and validated by comparison its predictions with reported simulation and experimental data on CO<sub>2</sub> DC glow discharges, operating at pressures 1–5 Torr, discharge currents of tenths of mA, and tube radius of 1 cm. The results show that the energy released from electronic and vibrational excitation of CO<sub>2</sub> dominates the gas heating at the early stage of the discharge. However, as the discharge progresses and reaches steady-state, following CO<sub>2</sub> dissociation, the de-excitation of electronically excited states of the products and the vibrational-translational exchanges of the CO vibrational state significantly contributes to the gas heating. Additionally, the quenching of excited states at the wall is both a major destruction pathway for these species and a contributor to the gas heating. This study provides a comprehensive perspective to the microscopic reactions and macroscopic parameters in CO<sub>2</sub> plasmas, which can inform optimization strategies for industrial applications.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"97 ","pages":"Article 103128"},"PeriodicalIF":7.2,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144134846","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}

引用次数: 0

Carbon capture and utilisation technologies: A systematic analysis of innovative applications and supercritical CO2 viability strategies 碳捕获和利用技术：对创新应用和超临界二氧化碳可行性策略的系统分析

IF 7.2 2区工程技术

Journal of CO2 Utilization Pub Date : 2025-05-23 DOI: 10.1016/j.jcou.2025.103115

G.B. Silva Junior, J. Castro-Gomes, M. Magrinho

{"title":"Carbon capture and utilisation technologies: A systematic analysis of innovative applications and supercritical CO2 viability strategies","authors":"G.B. Silva Junior, J. Castro-Gomes, M. Magrinho","doi":"10.1016/j.jcou.2025.103115","DOIUrl":"10.1016/j.jcou.2025.103115","url":null,"abstract":"<div><div>The growing increase in global carbon dioxide emissions is partially due to cement production, which has been an international concern. In this context, carbon capture and utilisation (CCU) technologies present themselves as a possible solution capable of using CO<sub>2</sub> and other industrial waste and transforming them into value-added products.To explore the potential of this approach, this study conducted a systematic literature review of review articles published between 2018 and 2024, with the aim of systematising information on the materials, methods, and technologies associated with CCU in the construction sector. To this end, the properties and potential use as binders and/or aggregates of various materials were analysed. The available CCU technologies were compared, with particular attention given to supercritical carbonation, including a systematisation of innovative applications and feasibility strategies. In addition, the challenges associated with the implementation of these technologies were analysed.The results revealed a significant increase in publications on the subject in recent years. In addition, the potential of biocements was highlighted, particularly for the repair of cracks in concrete. Biochar and slag proved to be viable for use as aggregates or binders. The study also revealed the emerging potential of supercritical carbonation in comparison to accelerated carbonation, particularly due to its high CO<sub>2</sub> capture efficiency. On the other hand, several challenges were identified, including a limited understanding of the reaction mechanisms.Finally, the study proposes a set of recommendations to support the implementation of the low-carbon strategies discussed, which have the potential to transform the construction sector.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"97 ","pages":"Article 103115"},"PeriodicalIF":7.2,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144116460","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}

引用次数: 0

Ruthenium-based MOF catalysts for methanation of CO2 derivatives 钌基MOF催化剂在CO2衍生物甲烷化反应中的应用

IF 7.2 2区工程技术

Journal of CO2 Utilization Pub Date : 2025-05-23 DOI: 10.1016/j.jcou.2025.103127

Itziar Arnaiz , Carlos Márquez-Álvarez , Marcos Zubimendi , M. Asunción Molina , Andrew M. Beale , Manuel Sánchez-Sánchez , Joaquín Pérez-Pariente

{"title":"Ruthenium-based MOF catalysts for methanation of CO2 derivatives","authors":"Itziar Arnaiz , Carlos Márquez-Álvarez , Marcos Zubimendi , M. Asunción Molina , Andrew M. Beale , Manuel Sánchez-Sánchez , Joaquín Pérez-Pariente","doi":"10.1016/j.jcou.2025.103127","DOIUrl":"10.1016/j.jcou.2025.103127","url":null,"abstract":"<div><div>Mitigating climate change is one of the biggest challenges of today's society. The most direct way to achieve this goal is to capture and use CO<sub>2</sub> as a source of energy and chemicals. This work, inspired by previous publications focused on homogeneous catalysis, proposes the transformation of the easy-to-prepare CO<sub>2</sub> derivatives dialkylureas into C1 chemicals using Ru-MOFs as heterogeneous catalysts. This choice is due to (i) the well-known ability of Ru to catalyze hydrogenation reactions and (ii) that Ru-complexes were the pioneer homogenous catalyst in converting CO<sub>2</sub> into an added-value C1 chemical, methanol. Apart from the already reported MOF Ru-HKUST-1, we have prepared a new Ru-MOF material, denoted Ru-BTC, analogous to the semiamorphous Fe-BTC. It has been found by XAS that Ru-BTC and Ru-HKUST-1 have different metal environment and oxidation states: only 3+ in Ru-BTC, a 50:50 mixture of 2+ and 3+ in Ru-HKUST-1. Both Ru-MOFs catalyzed the hydrogenation of N,N’-dimethylurea under relatively mild conditions, giving methane as the main product. Ru-BTC was particularly efficient: 67 % conversion and 96 % selectivity to CH<sub>4</sub> at 150 ºC and 30 bars of H<sub>2</sub> using a Ru/dimethylurea weight ratio of 1 %. Ru-MOFs were also able to transform CO<sub>2</sub> into CH<sub>4</sub>, again being Ru-BTC the most effective catalyst, but giving much poorer selectivity to CH<sub>4</sub>. Ru-MOFs, particularly Ru-BTC, were damaged under reaction conditions, but no significant Ru leaching was observed.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"97 ","pages":"Article 103127"},"PeriodicalIF":7.2,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144116391","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}

引用次数: 0

Pilot scale study of elevated pressure autothermal dry reforming of methane over Ni-UGSO pellets Ni-UGSO球团上甲烷高压自热干燥重整的中试研究

IF 7.2 2区工程技术

Journal of CO2 Utilization Pub Date : 2025-05-23 DOI: 10.1016/j.jcou.2025.103121

Muhammad Irfan Malik , Nicolas Abatzoglou , Jasmin Blanchard , Inès Esma Achouri

{"title":"Pilot scale study of elevated pressure autothermal dry reforming of methane over Ni-UGSO pellets","authors":"Muhammad Irfan Malik , Nicolas Abatzoglou , Jasmin Blanchard , Inès Esma Achouri","doi":"10.1016/j.jcou.2025.103121","DOIUrl":"10.1016/j.jcou.2025.103121","url":null,"abstract":"<div><div>This work investigates syngas production via the auto-thermal dry reforming (ATDR) of methane under a pressures range of 1–10 bar over Nickle supported upgraded slag oxide pellets (Ni-UGSO) prepared from metallurgical residues. The effects of process parameters (i.e., reaction pressure, temperature, feed ratio, gas hourly space velocity, and O<sub>2</sub> feed distribution) on methane conversion and syngas selectivity are also determined. The Ni-UGSO pellets consistently show resistance to coke formation owing to the excellent Ni dispersion in Al- and Fe-based spinels and Mg-rich silicates. The catalysts did not deactivate at pressures between 1–8 bar, and close to the equilibrium CH<sub>4</sub> conversion (80 %) was achieved at 8 bar, CH<sub>4</sub>/O<sub>2</sub> = 2, CH<sub>4</sub>/CO<sub>2</sub> = 3, 850°C, and 800 GHSV (L/h.kg). The pellets exhibited high activity and stability by providing a nearly constant H<sub>2</sub>/CO ratio (∼1) for 8 h at 8 bar under autothermal conditions. However, further operation was unfeasible because the O<sub>2</sub> feed line oxidized midway through the experiment at 850°C and 8 bar, highlighting challenges in maintaining material stability for elevated-pressure ATDR. The scanning electron microscope (SEM) and Transmission electron microscopy (TEM) analyses confirmed that, at 10 bar, a higher reactant concentration resulted in significant sintering, impacting both the active metal and support structure. This can be attributed to the higher extent of complete methane combustion, which generated excessive hotspots, decreased CO<sub>2</sub> conversion to 15 %, and led to the thermal degradation of the catalyst. Thus, the oxygen and methane distribution should be set carefully to avoid uncontrolled total methane combustion during the elevated-pressure ATDR of methane.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"97 ","pages":"Article 103121"},"PeriodicalIF":7.2,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144116468","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}

引用次数: 0

Mechanical robust and thermal insulated rPET microcellular foam via supercritical CO2 foaming cross-linked photovoltaic backsheet 机械坚固和隔热的rPET微孔泡沫通过超临界CO2发泡交联光伏背板

IF 7.2 2区工程技术

Journal of CO2 Utilization Pub Date : 2025-05-22 DOI: 10.1016/j.jcou.2025.103126

Jiajia Gu , Miao Lu , Wenhao Xie , Jiyun Jia , Chen Liu , Guochen Yang , Binghua Ma , Zhiyuan Chen , Chul B. Park , Ruiyan Zhang

{"title":"Mechanical robust and thermal insulated rPET microcellular foam via supercritical CO2 foaming cross-linked photovoltaic backsheet","authors":"Jiajia Gu , Miao Lu , Wenhao Xie , Jiyun Jia , Chen Liu , Guochen Yang , Binghua Ma , Zhiyuan Chen , Chul B. Park , Ruiyan Zhang","doi":"10.1016/j.jcou.2025.103126","DOIUrl":"10.1016/j.jcou.2025.103126","url":null,"abstract":"<div><div>Upcycling of solar panels plays important role in the photovoltaic sustainability. However, their reprocessed foaming was limited due to the low melt strength of the backsheet material after long-term usage. Herein, we utilized chain extender (CE), a copolymer made of glycidyl methacrylate (GMA) and styrene to enhance the melt strength of recycled polyethylene terephthalate (rPET) via the formation of chemical cross-linking network. According to Fourier transform infrared spectroscopy (FTIR) spectrum, the epoxy groups in GMA participated into cross-linking reaction since absorption peaks of 758 cm<sup>−1</sup>, 847 cm<sup>−1</sup>, 902 cm<sup>−1</sup> and 1248 cm<sup>−1</sup> assigned with epoxy group disappeared after reactive extrusion. Consequently, the glass transition temperature increased to 78.5 ℃, and the crystallinity decreased 37.7 % gradually with CE content of 5 %. Rheological results showed that the zero-shear viscosity dramatically increased to 19692.1 Pa·s, almost 100-folds for unmodified rPET, demonstrating the viscoelasticity transition from “liquid” viscos state to “solid” elastic rPET with incorporation of cross-linking agent. With the assistance of two-step supercritical CO<sub>2</sub> foaming technology, the rPET microcellular foam with high compressive strength and thermal insulated performance can be developed. Specifically, the void fraction increased up to 85.6 %, the average cell size could decrease to 9.2 µm, the cell density increased up to 1.98 × 10<sup>9</sup> cells/cm<sup>3</sup>, thermal conductivity reduced to 48.5 mW/(m·K), the compressive strength of the rPET foam can reach up to 6.84 MPa. As a proof of concept, this work provides a novel route to develop mechanical robust and thermal insulated rPET microcellular foam for resource utilization of disposed photovoltaic backsheet.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"97 ","pages":"Article 103126"},"PeriodicalIF":7.2,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144105765","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}

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