Journal of CO2 Utilization最新文献_第6页

Molybdenum and tungsten carbides as catalysts for the reverse water gas shift reaction 碳化钼和碳化钨作为水煤气倒转反应的催化剂

IF 8.4 2区工程技术

Journal of CO2 Utilization Pub Date : 2026-03-01 Epub Date: 2026-01-16 DOI: 10.1016/j.jcou.2026.103327

Dahi Akmach , Shang Jiang , Anik Ashirwadam , Malak El Kaddouri , Samir H. Mushrif , Serge Kaliaguine , David S.A. Simakov

{"title":"Molybdenum and tungsten carbides as catalysts for the reverse water gas shift reaction","authors":"Dahi Akmach , Shang Jiang , Anik Ashirwadam , Malak El Kaddouri , Samir H. Mushrif , Serge Kaliaguine , David S.A. Simakov","doi":"10.1016/j.jcou.2026.103327","DOIUrl":"10.1016/j.jcou.2026.103327","url":null,"abstract":"<div><div>For the sustainable utilization of carbon dioxide (CO<sub>2</sub>), the development of an inexpensive, active, selective and highly stable catalyst is essential to overcome the economic challenges in its reduction to carbon monoxide (CO). Molybdenum and tungsten carbides-based materials are regarded as attractive catalysts for the reverse water gas shift RWGS reaction. This work began with a series of catalytic tests indicating that mixed Mo-W carbides behave essentially like blends of monocarbides Mo<sub>2</sub>C and WC. To establish a performance baseline, an in-depth evaluation of the two monometallic carbides was conducted enabling a precise assessment of their intrinsic activity and mechanistic behavior under RWGS conditions. The results revealed that Mo<sub>2</sub>C promoted the formation of both CH<sub>4</sub> and CO, while increasing the tungsten content gradually, enhances CO selectivity with decreasing reaction rate. Monometallic tungsten carbide WC achieved complete CO selectivity and maintained it even after 100 h exposure to harsh reaction conditions at 600 ˚C. In-situ DRIFTS and density functional theory (DFT) calculations revealed that WC can achieve 100 % CO selectivity through two distinct mechanisms on different facets, a concerted redox mechanism on WC (-100), and an associative mechanism on WC (101) facet where further hydrogenation of *CHO intermediate is kinetically unfavorable. Both pathways steer the reaction toward CO production and prevent the formation of undesired side product CH<sub>4</sub>. This work not only provides valuable insights into the role of metal carbide phases in catalytic performance but also contributes to the fundamental understanding of reaction mechanism.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"105 ","pages":"Article 103327"},"PeriodicalIF":8.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145976259","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

Preparation of high purity CaCO3 by carbonation of carbide slag after physical impurity removal: calcination, cyclone and magnetic separation 电石渣经煅烧、旋流器、磁选等物理除杂后碳化制备高纯碳酸钙

IF 8.4 2区工程技术

Journal of CO2 Utilization Pub Date : 2026-03-01 Epub Date: 2026-01-17 DOI: 10.1016/j.jcou.2026.103329

Zhuohui Ma , Wenhao Ning , Huaigang Cheng , Bo Wang

{"title":"Preparation of high purity CaCO3 by carbonation of carbide slag after physical impurity removal: calcination, cyclone and magnetic separation","authors":"Zhuohui Ma , Wenhao Ning , Huaigang Cheng , Bo Wang","doi":"10.1016/j.jcou.2026.103329","DOIUrl":"10.1016/j.jcou.2026.103329","url":null,"abstract":"<div><div>The co-production of high-purity CaCO<sub>3</sub> by carbonating CO<sub>2</sub> from carbide slag (CS) has attracted significant attention. However, due to the complex composition of CS and the difficulty in separating Ca element, it is difficult to balance the carbonation cost and quality of the product. In this study, CS was used as raw material, and a method of preparing high-purity CaCO<sub>3</sub> through calcination, cyclone and magnetic separation, named multi-stage impurity removal, was proposed firstly. The effects of calcination time and temperature on mineral phase transformation and the purity and whiteness of CaCO<sub>3</sub> prepared by carbonation during the calcination of carbide slag were studied. The effects of cyclone and magnetic separations were also discussed. The mechanism for the removal of impurities through high-temperature calcination was discussed innovatively. The optimum process conditions for multi-stage impurity removal and carbonation were determined, after calcination at 900 ℃ for 3 h, the CS was transported to cyclone separation at an inlet volumetric flow rate of 80 m³ /h. The separated substrate was then formulated into a pulp with a S/L of 10 % for magnetic separation. The CS pulp obtained after magnetic separation entered the carbonation process, where it was aerated with CO<sub>2</sub> at a flow rate of 0.2 L/min for carbonation. This process resulted in calcite-type CaCO<sub>3</sub> with the purity and whiteness of 97.8 % and 97.4, respectively. Finally, the cost of the process was estimated. The total initial investment cost was approximately CNY 6.51 million, while the total operating cost was CNY 1915.85/t of CaCO<sub>3</sub>.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"105 ","pages":"Article 103329"},"PeriodicalIF":8.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146025236","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

Molecular dynamics study on the mechanisms of ultrafine bubbles in CO2 hydrate formation CO2水合物超细气泡形成机理的分子动力学研究

IF 8.4 2区工程技术

Journal of CO2 Utilization Pub Date : 2026-03-01 Epub Date: 2026-01-21 DOI: 10.1016/j.jcou.2026.103335

Hamidreza Hassanloo, Xinyan Wang

{"title":"Molecular dynamics study on the mechanisms of ultrafine bubbles in CO2 hydrate formation","authors":"Hamidreza Hassanloo, Xinyan Wang","doi":"10.1016/j.jcou.2026.103335","DOIUrl":"10.1016/j.jcou.2026.103335","url":null,"abstract":"<div><div>The accelerating rise in atmospheric CO₂, driven by anthropogenic emissions, necessitates urgent mitigation strategies. Among carbon capture and storage (CCS) technologies, CO₂ hydrate-based methods offer a promising pathway for efficient sequestration, storage, and utilization. However, the inherently slow kinetics of hydrate nucleation and growth limit their practical application. This study explores the use of various nanobubbles (NBs), including hydrogen, nitrogen, oxygen, and carbon dioxide, as stable, nanoscale gas cavities that act as novel promoters to enhance CO₂ hydrate formation, using molecular dynamics (MD) simulations. The results demonstrate that under optimal thermodynamic conditions, the presence of NBs significantly enhances hydrate formation. This enhancement is attributed to the hydrophobic NB surfaces acting as nucleation spots, promoting local concentration gradients and accelerating clathrate formation kinetics, while reducing the likelihood of random nucleation events in the bulk phase. Due to their smaller molecular sizes, hydrogen and nitrogen NBs further facilitate hydrate formation by diffusing into the solution from the NB core. However, lower temperature, as a primary sub-optimal thermal condition, reduce molecular mobility and suppress these mechanisms, thereby hindering hydrate growth. At elevated pressures, NBs exhibit a dual role, both promoting and inhibiting hydrate formation, and the comparison with non-nanobubbled samples reveals a pressure-dependent shift in the dominant nucleation mechanism from NB-induced interfacial ordering to bulk-phase interactions.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"105 ","pages":"Article 103335"},"PeriodicalIF":8.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146025330","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

Phase behavior of binary mixtures of CO2 with methyl, ethyl, and butyl (Phenylacetates) at elevated pressures 二氧化碳与甲基、乙基和丁基（苯乙酸酯）二元混合物在高压下的相行为

IF 8.4 2区工程技术

Journal of CO2 Utilization Pub Date : 2026-03-01 Epub Date: 2026-02-06 DOI: 10.1016/j.jcou.2026.103354

Uma Sankar Behera , Jiyun Shim , Hun-Soo Byun

{"title":"Phase behavior of binary mixtures of CO2 with methyl, ethyl, and butyl (Phenylacetates) at elevated pressures","authors":"Uma Sankar Behera , Jiyun Shim , Hun-Soo Byun","doi":"10.1016/j.jcou.2026.103354","DOIUrl":"10.1016/j.jcou.2026.103354","url":null,"abstract":"<div><div>The increasing demand for alkyl phenylacetates, owing to their distinctive characteristics and diverse industrial applications, highlights the necessity of accurate vapor–liquid equilibrium (VLE) data for efficient process design. This is especially crucial in separation processes employing supercritical carbon dioxide (CO<sub>2</sub>) as a green solvent. This work deals with the phase transition study of binary mixtures comprising CO<sub>2</sub> and methyl, ethyl, butyl phenylacetate, which was systematically examined within 313.2 K–393.2 K (in 20 K increments) and pressures reaching up to 24.62 MPa. No prior studies have reported detailed isothermal VLE data over such an extensive mole fraction range at elevated pressures for these systems, making this study a unique contribution. Analysis of pressure–temperature behavior indicated that the critical mixture curve connects the critical points of pure CO<sub>2</sub> and each alkyl phenylacetate, consistent with Type-I curve as defined by van Konynenburg and Scott. For all binary systems, solubility improved with increasing phenylacetate concentration, accompanied by a corresponding reduction in system pressure under constant temperature conditions. The experimental bubble point data were fitted using the Peng–Robinson equation of state (PR EoS) combined with the van der Waals one-fluid mixing rule. The interaction (binary) parameters were optimized for each system: methyl phenylacetate (k<sub>ij</sub> = 0.028, η<sub>ij</sub> = –0.040), ethyl phenylacetate (k<sub>ij</sub> = 0.020, η<sub>ij</sub> = –0.040), and butyl phenylacetate (k<sub>ij</sub> = 0.040, η<sub>ij</sub> = –0.045). The PR EoS model exhibited strong agreement with experimental findings, as reflected by root mean square deviation (RMSD%) ranging between 3.82 % and 5.20 % across all three binary systems and studied temperatures.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"105 ","pages":"Article 103354"},"PeriodicalIF":8.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146170657","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 dioxide capture from air in buildings – Design and techno-economic feasibility of practical systems 建筑物中空气中的二氧化碳捕获。实用系统的设计和技术经济可行性

IF 8.4 2区工程技术

Journal of CO2 Utilization Pub Date : 2026-03-01 Epub Date: 2026-02-13 DOI: 10.1016/j.jcou.2026.103351

Dominik Heß, Michael Rubin, Roland Dittmeyer

{"title":"Carbon dioxide capture from air in buildings – Design and techno-economic feasibility of practical systems","authors":"Dominik Heß, Michael Rubin, Roland Dittmeyer","doi":"10.1016/j.jcou.2026.103351","DOIUrl":"10.1016/j.jcou.2026.103351","url":null,"abstract":"<div><div>Direct Air Capture (DAC) is needed alongside other CO<sub>2</sub> removal methods to ensure that the total amount of CO<sub>2</sub> required is removed from the atmosphere so that global warming can be limited to below 2 °. While large-scale DAC farms are a promising solution, their high CAPEX and OPEX, along with societal concerns, may hinder widespread deployment. This study presents a novel, modular DAC concept designed for integration into heating, ventilation, and air conditioning (HVAC) systems of buildings. A prototype was engineered and modeled in MATLAB to analyze key physical processes in the adsorber bed using two amine-based adsorbents. A linear driving force model was applied to simulate mass transport, and the DAC unit was coupled with an HVAC system in Simulink to evaluate CO₂ capture from indoor air. Solar thermal energy with thermal storage was defined as the heat source. Optimization results indicate a 40 % reduction in thermal energy demand compared to separate DAC and HVAC systems. Cold, humid air improves CO₂ capture, while dry air significantly lowers the energy demand – up to 50 % when reducing humidity from 90 % to 10 %. A techno-economic analysis suggests that mass-produced DAC modules for HVAC systems could achieve levelized costs of DAC as low as 280 € per ton CO<sub>2</sub>, particularly when waste heat is utilized. Implementation in densely occupied buildings may yield additional savings of up to 9 %. This work highlights the potential of HVAC-integrated DAC systems as a scalable, cost-effective complement to centralized DAC facilities.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"105 ","pages":"Article 103351"},"PeriodicalIF":8.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146170848","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

Kinetic and catalytic evaluation of a stable and selective Zn-Cr/KIT-6 catalyst for propane dehydrogenation using CO2 as a mild oxidant 以CO2为温和氧化剂的稳定选择性Zn-Cr/KIT-6丙烷脱氢催化剂的动力学和催化评价

IF 8.4 2区工程技术

Journal of CO2 Utilization Pub Date : 2026-02-01 Epub Date: 2026-01-06 DOI: 10.1016/j.jcou.2025.103311

Hanieh Habibpoor, Majid Taghizadeh

{"title":"Kinetic and catalytic evaluation of a stable and selective Zn-Cr/KIT-6 catalyst for propane dehydrogenation using CO2 as a mild oxidant","authors":"Hanieh Habibpoor, Majid Taghizadeh","doi":"10.1016/j.jcou.2025.103311","DOIUrl":"10.1016/j.jcou.2025.103311","url":null,"abstract":"<div><div>The oxidative dehydrogenation (ODH) of propane using CO<sub>2</sub> as a soft oxidant represents a promising strategy for selective propylene production alongside effective CO₂ valorization, emphasizing the critical need for highly active and stable catalysts. In this work, a series of Cr-based catalysts with chromium loadings ranging from 3 to 10 wt% were synthesized via the incipient-wetness impregnation method, employing three-dimensional mesoporous silica KIT-6 as the support. The catalysts were further modified by zinc promotion to enhance catalytic performance in the CO<sub>2</sub>-ODP. Comprehensive physicochemical characterization-including XRD, FT-IR, SEM, EDX elemental mapping, HRTEM, N<sub>2</sub> physisorption, H<sub>2</sub>-TPR, NH<sub>3</sub>-TPD, CO<sub>2</sub>-TPD, XPS, Raman and TGA-confirmed that the ordered 3D mesoporous structure of KIT-6 was retained post-metal impregnation, facilitating superior dispersion of chromium oxide species. Among the prepared catalysts, 7 %Cr/KIT-6 exhibited optimal propane conversion and propylene selectivity. Zinc promotion significantly enhanced the chromium-support interaction and increased the surface concentration of highly oxidizing Cr<sup>6 +</sup> species, which plays a crucial role in improving catalytic activity for the propane dehydrogenation reaction. The 1.5 %Zn-7 %Cr/KIT-6 catalyst exhibited initially superior performance at 550 °C, achieving 50.7 % propane conversion, with propylene selectivity and yield of 79.9 % and 40.5 %, respectively. Kinetic studies based on the Langmuir-Hinshelwood model effectively described the reaction mechanism over the promoted catalyst. The estimated apparent activation energy (<span><math><msubsup><mrow><mi>E</mi></mrow><mrow><mi>a</mi><mi>p</mi><mi>p</mi></mrow><mrow><mi>c</mi><mi>a</mi><mi>t</mi></mrow></msubsup></math></span> = 83.98 kJ·mol<sup>−1</sup>) indicates that the dehydrogenation proceeds rapidly and more easily in the presence of this catalyst.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"104 ","pages":"Article 103311"},"PeriodicalIF":8.4,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145898066","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

Synthesis and evaluation of bifunctional reforming-shift composite catalysts on metal foams for methanol steam reforming with reduced CO production 金属泡沫双功能重整-移位复合催化剂的合成与评价

IF 8.4 2区工程技术

Journal of CO2 Utilization Pub Date : 2026-02-01 Epub Date: 2026-01-10 DOI: 10.1016/j.jcou.2026.103323

S. Gorji , S. Zarrinpashne , A. Zamaniyan , N. Mostoufi , H. Kiarad

{"title":"Synthesis and evaluation of bifunctional reforming-shift composite catalysts on metal foams for methanol steam reforming with reduced CO production","authors":"S. Gorji , S. Zarrinpashne , A. Zamaniyan , N. Mostoufi , H. Kiarad","doi":"10.1016/j.jcou.2026.103323","DOIUrl":"10.1016/j.jcou.2026.103323","url":null,"abstract":"<div><div>This study investigates a strategy to reduce carbon monoxide (CO) content in the product gas from methanol steam reforming, a critical challenge since CO acts as a poison for fuel cell catalysts. To achieve this, bifunctional catalysts were developed on metallic foams. Bifunctional catalysts consisting of a leading layer of reforming catalyst composed of Cu/Zn/Zr oxides, followed by a low temperature water-gas shift (LTS) catalyst layer composed of Cu/Zn oxides, were synthesized over copper and nickel foams that were precoated with a thin layer of Al<sub>2</sub>O<sub>3</sub>. The effects of foam material, catalyst loading, share of LTS layer, reactor temperature, feed space velocity and steam to carbon ratio were studied on the performance of the catalyst in a microreactor system regarding methanol conversion, specific hydrogen (H<sub>2</sub>) production rate and CO content of the product gas. The bifunctionalization approach proved highly effective, achieving over 70 % reduction in CO production, corresponding to a CO content in the product gas of less than 0.4 vol%, accompanied by no significant loss in methanol conversion. The bifunctional catalyst exhibited superior activity at lower temperatures, enhanced long term performance and higher specific H<sub>2</sub> production compared to similar studies on mono-functional reforming catalysts. It may be considered as a step forward in portable H<sub>2</sub> generator systems via steam reforming of methanol, with a more compact size and less CO production.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"104 ","pages":"Article 103323"},"PeriodicalIF":8.4,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145923589","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

Hydrophobicity-guided CO-CO coupling pathways in ZIF-8 modified Cu2O for efficient CO electroreduction ZIF-8修饰Cu2O中疏水引导CO-CO偶联途径的高效CO电还原

IF 8.4 2区工程技术

Journal of CO2 Utilization Pub Date : 2026-02-01 Epub Date: 2026-01-06 DOI: 10.1016/j.jcou.2026.103315

Ziyun Xi , Yunyi Xiao , Shuai Luo , Min Liu , Zijun Yan , Runze Bi , Hongling Qin , Cong Wan , Cijie Liu , Tao Wu , Honglei Zhang

{"title":"Hydrophobicity-guided CO-CO coupling pathways in ZIF-8 modified Cu2O for efficient CO electroreduction","authors":"Ziyun Xi , Yunyi Xiao , Shuai Luo , Min Liu , Zijun Yan , Runze Bi , Hongling Qin , Cong Wan , Cijie Liu , Tao Wu , Honglei Zhang","doi":"10.1016/j.jcou.2026.103315","DOIUrl":"10.1016/j.jcou.2026.103315","url":null,"abstract":"<div><div>The electrochemical CO reduction reaction offered a sustainable approach to convert carbon monoxide into multi-carbon products, yet controlling C-C coupling remained challenging. Herein, we designed a Z-Cu electrocatalyst by coating Cu<sub>2</sub>O nanoparticles with ZIF-8, which enabled interfacial modulation of the electronic structure and surface wettability. Structural analyses confirmed strong Cu-Zn interactions, while electrochemical measurements revealed that Z-Cu favored C<sub>2</sub> products at low current densities. Both experimental and DFT calculations demonstrated that Z-Cu suppressed the hydrogenation of *CO into *COH through hydrophobic repulsion and steric hindrance, thereby inhibiting the asymmetric *CO-*COH pathway toward *OCCOH formation. Instead, Z-Cu predominantly facilitated the symmetric *CO-*CO coupling. The optimal enhanced factor of Z-Cu is 5.5 at 50 mA cm<sup>−2</sup>. This work underscored the decisive role of hydrophobicity and interfacial electronic modulation in directing CORR pathways, providing new mechanistic insights and a generalizable design principle for advancing Cu-based catalysts toward efficient multi-carbon fuel and chemical production.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"104 ","pages":"Article 103315"},"PeriodicalIF":8.4,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145898067","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

Encapsulating Cu nanoparticles within MIL-101 for efficient and selective N-methylation of amines using CO2/H2 在MIL-101中封装Cu纳米颗粒，利用CO2/H2有效和选择性地进行胺的n -甲基化

IF 8.4 2区工程技术

Journal of CO2 Utilization Pub Date : 2026-02-01 Epub Date: 2026-01-06 DOI: 10.1016/j.jcou.2025.103309

Jianfang Liu, Shuaichong Ding, Li Wang, Weiye Zhang, Lei Wang, Yu Li

{"title":"Encapsulating Cu nanoparticles within MIL-101 for efficient and selective N-methylation of amines using CO2/H2","authors":"Jianfang Liu, Shuaichong Ding, Li Wang, Weiye Zhang, Lei Wang, Yu Li","doi":"10.1016/j.jcou.2025.103309","DOIUrl":"10.1016/j.jcou.2025.103309","url":null,"abstract":"<div><div>The use of CO<sub>2</sub>/H<sub>2</sub> for amine N-methylation provides a green and sustainable pathway for CO<sub>2</sub> utilization and the production of N-methylamines. However, the research on advanced catalysts still poses a challenge. Herein, we confined ultrasmall Cu nanoparticles within MIL-101 for catalyzing the N-methylation of amines using CO<sub>2</sub>/H<sub>2</sub>. When the molar ratio of NaBH<sub>4</sub>/Cu was 2:1, the 5 %Cu@MIL-101(Cr) catalyst exhibited excellent catalytic performance and cycling stability. Using cyclohexane as the solvent, under conditions of 4 MPa (P<sub>H2</sub>/P<sub>CO2</sub> = 3), and 200 °C for 8 h, the conversion of aniline (AN) reached 94.8 %, with a selectivity of 93.1 % for methylaniline (MA). Benefiting from the confinement effect of the MOF cages, no significant agglomeration of Cu particles was observed in the catalyst after the reaction. The coexistence of Cu<sup>0</sup>-Cu<sup>+</sup>-Cu<sup>2+</sup> and their synergistic interaction with the Cr–oxo clusters facilitated the high activity of Cu@MIL-101(Cr). Control experiments indicated that CO<sub>2</sub> activated on the Cu<sup>+</sup> and O<sup>2−</sup> of the Cr–oxo clusters preferentially reacts with the AN adsorbed on adjacent Cu<sup>2+</sup> and unsaturated Cr<sup>3+</sup> sites, forming a phenylcarbamic acid intermediate. This intermediate is subsequently stepwise hydrogenated to MA by spillover H* atoms dissociated on neighboring Cu<sup>0</sup> sites.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"104 ","pages":"Article 103309"},"PeriodicalIF":8.4,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145898064","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

Ultra-rapid direct dissociation of CO₂ with dense pulsed plasma jets for Martian oxygen production 用密集脉冲等离子体射流超快速直接解离二氧化碳，用于火星氧气生产

IF 8.4 2区工程技术

Journal of CO2 Utilization Pub Date : 2026-02-01 Epub Date: 2026-01-15 DOI: 10.1016/j.jcou.2026.103326

Adrian Scurtu, Dorina Ticoş, Constantin Diplaşu, Nicoleta Udrea, Maria Luiza Mitu, Beatrice Paraschiv, Cătălin M. Ticoş

{"title":"Ultra-rapid direct dissociation of CO₂ with dense pulsed plasma jets for Martian oxygen production","authors":"Adrian Scurtu, Dorina Ticoş, Constantin Diplaşu, Nicoleta Udrea, Maria Luiza Mitu, Beatrice Paraschiv, Cătălin M. Ticoş","doi":"10.1016/j.jcou.2026.103326","DOIUrl":"10.1016/j.jcou.2026.103326","url":null,"abstract":"<div><div>Intense pulsed plasma jets with electron densities of in excess of 10²¹ m⁻³ and temperatures of ∼13 eV were used to dissociate CO₂ under Martian pressure conditions at 1–5 Torr for in-situ oxygen production. Our method demonstrated 20–50 times greater temporal efficiency than an RF plasma, which achieved a 23 % conversion in ∼450 s. This advantage stems from our method’s reduced sensitivity to non-thermal back reactions and thermal recombination, as well as its notably short CO₂ dissociation time of just 5 nanoseconds. A peak conversion rate of 33.29 % was reached at 1 Torr, with an O₂ produced mass of 5.5 mg per pulse at 5 Torr. Energy efficiency reached 7.2 % at a low specific energy input (SEI) of less than < 11 eV/molecule, surpassing RF and DC plasmas which feature 1.6 %, although all plasma systems exhibit reduced efficiency at low pressures due to high SEI from low molecular density. These findings highlight pulsed plasma jets as a promising, scalable solution for rapid oxygen generation on Mars, with optimization via larger chambers and possibly catalysts approach.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"104 ","pages":"Article 103326"},"PeriodicalIF":8.4,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145974106","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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