Journal of CO2 Utilization最新文献_第3页

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 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization

Pub Date : 2026-01-10 DOI: 10.1016/j.jcou.2026.103323

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

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 Al₂O₃. 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 (H₂) 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 H₂ production compared to similar studies on mono-functional reforming catalysts. It may be considered as a step forward in portable H₂ generator systems via steam reforming of methanol, with a more compact size and less CO production.

本研究探讨了一种降低甲醇蒸汽重整产物气体中一氧化碳（CO）含量的策略，这是一项关键挑战，因为一氧化碳对燃料电池催化剂来说是一种毒药。为了实现这一目标，在金属泡沫上开发了双功能催化剂。在预涂有Al2O3薄层的铜和镍泡沫表面上，合成了由Cu/Zn/Zr氧化物组成的前置转化催化剂层和由Cu/Zn氧化物组成的低温水气转换（LTS）催化剂层组成的双功能催化剂。研究了泡沫材料、催化剂负载、LTS层份额、反应器温度、进料空速和汽碳比等因素对催化剂在微反应器系统中甲醇转化率、产氢率和产物气体CO含量的影响。双功能化方法被证明是非常有效的，CO产量降低了70% %以上，对应于产品气体中的CO含量低于0.4 vol%，同时甲醇转化没有显著损失。与同类研究的单功能重整催化剂相比，双功能催化剂在低温下表现出更强的活性、更强的长期性能和更高的比H2产率。它可以被认为是便携式氢气发生器系统的一个进步，通过甲醇的蒸汽重整，具有更紧凑的尺寸和更少的CO生产。

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引用次数: 0

New composite materials based on g-C3N4 loaded with Copper(I) oxalate as promoters of C-C coupling in CO2-H2O co-processing under solar irradiation 基于g-C3N4负载草酸铜(I)作为太阳辐照下CO2-H2O协同处理中C-C偶联促进剂的新型复合材料

IF 8.4 2区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization

Pub Date : 2026-01-10 DOI: 10.1016/j.jcou.2026.103317

Michele Aresta , Domenico Caringella , Ernesto Mesto , Christopher Habu , Angela Dibenedetto

New composites made of copper(I)oxalate mixed with g-C₃N₄ by High Energy Milling (HEM) (at 800 rpm) in various w/w percentage (10, 20, 50 % w/w) and for different milling times (30–90 min) are shown to be active as gas-phase photocatalysts in coprocessing “CO₂ and H₂O” under solar irradiation (0.1 W cm⁻²) at room temperature to afford ethene or acetone in the range of 20–50 μmol g⁻¹ h⁻¹. The materials have been characterized by UV–VIS DRS, FTIR, elemental analyses, XRD, SEM, Band-gap and chopped photocurrent. The CO2RPs have been identified through GC, GC-MS and multinuclear NMR. Materials have been tested for over 15 h in gas-phase photochemical reactions and shown to be stable towards: the exchange with ¹³CO₂, used to exclude “false positives”, disproportionation to afford CO and CO₃^2-, and oxalate anion reduction. Cu(I)-oxalate modifies the properties of g-C₃N₄ and most likely is even implied in C-C coupling, as the Cu-Cu distance (255 pm, as determined by XRD in this work) is suited for promoting C-C coupling and is kept constant during operation by the backbone-action of the oxalate anion, which avoids Cu-centres random distribution, that would cause C-C coupling regression.

在太阳辐照（0.1 w cm−2）下，以不同的w/w比例（10、20、50 % w/w）和不同的研磨时间（30-90 min），在800 rpm下，草酸铜(I)与g- c3n4混合制成的新型复合材料在室温下作为气相光催化剂，在CO2和H2O的协同处理中具有活性，产生20 - 50 μmol g−1 h−1范围内的乙烯或丙酮。采用UV-VIS DRS、FTIR、元素分析、XRD、SEM、带隙和斩波光电流对材料进行了表征。通过气相色谱、气相色谱-质谱和多核磁共振对co2rp进行了鉴定。材料已经在气相光化学反应中测试了超过15 h，并显示出稳定的：与13CO2交换，用于排除“假阳性”，歧化以提供CO和CO32-，以及草酸阴离子还原。Cu(I)-草酸盐改变了g-C3N4的性质，甚至很可能隐含在C-C耦合中，因为Cu-Cu距离（255 pm，本文通过XRD测定）适合促进C-C耦合，并且在运行过程中通过草酸阴离子的主干作用保持恒定，避免了Cu中心随机分布导致C-C耦合回归。

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引用次数: 0

Advancing synthetic fuel technology: A model study for the integration of direct air carbon capture and diesel synthesis 推进合成燃料技术：直接空气碳捕获与柴油合成集成的模型研究

IF 8.4 2区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization

Pub Date : 2026-01-10 DOI: 10.1016/j.jcou.2026.103319

Alexander Guzman-Urbina , Tantiwatthanaphanich Thanapan , Jubil Joy , Karina Anaya , Jalil Shadbahr , Amit Kumar , Giovanna Gonzales-Calienes , Shinichirou Morimoto

Direct air capture (DAC) integrated with solid oxide electrolysis (SOEC) and Fischer–Tropsch (FT) synthesis is a promising way to produce carbon-neutral liquid fuels. However, the high demand for renewable electricity, particularly from electrolytic hydrogen production, and limited cross-process integration pose key challenges to this mode of production. This study addressed these constraints by modeling a fully integrated DAC–SOEC–FT diesel system using a commercial, equation-oriented simulation platform under steady-state conditions and assuming that renewable power supplied the SOEC unit. The process design incorporated thermal and process-level integration with waste heat from the calciner, FT reactor, and SOEC burner repurposed for internal heating and feed conditioning. System-derived byproducts (e.g., naphtha, purge gases) were used as internal fuels to minimize external energy inputs and avoid additional emissions. Results showed that under ideal thermal integration scenarios, the theoretical internal recovery of up to 78% of total process heat could substantially reduce reliance on external utilities. While SOEC remained the primary electricity consumer (29.8 MWh/t-diesel), internal energy recovery mitigated auxiliary demands. Cradle-to-gate CO₂ emissions were net-negative and reached –1.20 kg-CO₂/kg-diesel in Japan and –1.56 kg-CO₂/kg-diesel in Canada. These results emphasized the strong synergies unlocked by integrated system design and offered a pathway toward energy-efficient, carbon-negative synthetic diesel suited for hard-to-abate transport sectors.

直接空气捕获（DAC）与固体氧化物电解（SOEC）和费托合成（FT）相结合是一种很有前途的生产碳中性液体燃料的方法。然而，对可再生电力的高需求，特别是来自电解氢生产的高需求，以及有限的跨流程集成，对这种生产模式构成了关键挑战。本研究通过在稳态条件下使用商业化的、面向方程的仿真平台对完全集成的DAC-SOEC-FT柴油系统进行建模，并假设SOEC单元由可再生能源供电，从而解决了这些限制。工艺设计将热和工艺级集成与来自煅烧炉、FT反应器和SOEC燃烧器的废热结合起来，重新用于内部加热和饲料调节。系统衍生的副产品（例如，石脑油，吹扫气体）被用作内部燃料，以尽量减少外部能量输入并避免额外的排放。结果表明，在理想的热集成方案下，理论内部回收高达78%的过程总热量可以大大减少对外部公用设施的依赖。虽然SOEC仍然是主要的电力消费者（29.8兆瓦时/吨柴油），但内部能量回收减轻了辅助需求。从摇篮到闸门的二氧化碳净排放量为负，在日本达到-1.20公斤二氧化碳/公斤柴油，在加拿大达到-1.56公斤二氧化碳/公斤柴油。这些结果强调了集成系统设计所带来的强大协同效应，并为节能、负碳合成柴油的发展提供了一条途径，适用于难以减排的运输部门。

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引用次数: 0

Sustainable utilization of flue gas components (CO2, SO2, and NOx) in skim rubber production via microbubble technology 通过微泡技术可持续利用脱脂橡胶生产中的烟气成分（CO2、SO2和NOx）

IF 8.4 2区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization

Pub Date : 2026-01-08 DOI: 10.1016/j.jcou.2026.103321

Hnin Nandar Soe , Matthana Khangkhamano , Rungrote Kokoo , Si Thu Myint Maung , Lerrat Chuaibamrung

Flue gas, a major industrial pollutant, highlights the urgent need for technologies that can either capture emissions at their source or transform them into environmentally friendly materials. Meanwhile, conventional skim rubber production poses significant environmental and health concerns, including the generation of acidic wastewater, the release of air pollutants, and the risks associated with handling concentrated sulfuric acid and open-air ammonia removal. This study presents a green and innovative approach that utilizes flue gas as a sustainable feedstock for skim rubber production via microbubble-assisted coagulation, addressing these critical challenges. Coagulation and de-ammonization of skim latex using different flue gas components (CO₂, SO₂, and NO_x) via the microbubble process were discussed. The microstructural, physical, and mechanical properties of skim rubber coagulated with microbubbles containing different flue gas components (CO₂, SO₂, and NO_x) were systematically compared with those obtained from the conventional process. Results demonstrated that microbubble-coagulated skim rubber exhibited enhanced physical and mechanical properties compared to conventionally coagulated samples. The process reduces costs, minimizes effluent discharge, and lowers air pollution, offering a sustainable solution to both flue gas utilization and limitations of conventional coagulation.

烟气是一种主要的工业污染物，它突出表明迫切需要能够从源头捕获排放或将其转化为环境友好材料的技术。与此同时，传统的脱脂橡胶生产带来了重大的环境和健康问题，包括产生酸性废水、释放空气污染物以及处理浓硫酸和露天除氨所带来的风险。本研究提出了一种绿色创新的方法，利用烟气作为微泡辅助混凝法生产脱脂橡胶的可持续原料，解决了这些关键挑战。探讨了不同烟气组分（CO2、SO2和NOx）对脱脂乳胶微泡法的混凝和脱氨效果。用含有不同烟气组分（CO2、SO2和NOx）的微气泡混凝脱脂橡胶，系统地比较了其微观结构、物理和机械性能。结果表明，微泡混凝的脱脂橡胶比常规混凝的橡胶具有更好的物理力学性能。该工艺降低了成本，最大限度地减少了废水排放，降低了空气污染，为烟气利用和传统混凝的局限性提供了可持续的解决方案。

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引用次数: 0

Elucidating nitrogen doping effects in carbon-based CO2 adsorbents through data-driven analysis for rational adsorbent design 通过数据驱动分析阐明碳基CO2吸附剂中的氮掺杂效应，为吸附剂的合理设计提供依据

IF 8.4 2区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization

Pub Date : 2026-01-08 DOI: 10.1016/j.jcou.2026.103316

Permjit Asawarungruengchai , Phongphot Sakulaue , Krittapong Deshsorn , Pawin Iamprasertkun , Natsuda Kaothanthong , Khanin Nueangnoraj

The influence of nitrogen doping on the CO₂ adsorption performance of carbon-based materials remains debated, with unclear conclusions regarding whether surface chemistry or textural properties primarily govern adsorption behavior. In this study, we systematically examined the effects of nitrogen content and surface area on CO₂ adsorption capacity using a data-driven statistical approach. A comprehensive dataset of 1215 experimental data points compiled from 100 publications was analyzed through correlation analysis, multiple linear regression, and mediation analysis. The results reveal that nitrogen content and surface area are interrelated and may exert competing effects on adsorption. Multiple linear regression confirms that surface area exerts a substantially greater influence on CO₂ adsorption than nitrogen content, as indicated by higher standardized regression coefficients at both 273 K and 298 K. Mediation analysis further demonstrates that the influence of nitrogen on CO₂ adsorption occurs predominantly indirectly through its modification of surface area, with mediated proportions of 70.1 % and 58.2 %, respectively. A comparative evaluation of nitrogen-doped and undoped carbons supports these findings, showing consistent positive correlations between surface area and CO₂ adsorption capacity regardless of nitrogen incorporation. These results provide quantitative evidence that textural development and surface accessibility play a more decisive role than nitrogen functionalities in CO₂ capture. The insights obtained here establish a data-driven foundation for the rational design and future machine-learning optimization of advanced carbon-based CO₂ adsorbents.

氮掺杂对碳基材料的CO2吸附性能的影响仍然存在争议，关于表面化学性质还是结构性质主要影响吸附行为的结论尚不明确。在这项研究中，我们使用数据驱动的统计方法系统地研究了氮含量和表面积对CO2吸附能力的影响。通过相关分析、多元线性回归和中介分析，对100篇文献中1215个实验数据点的综合数据集进行分析。结果表明，氮含量和表面积是相互关联的，并可能对吸附产生竞争效应。多元线性回归证实，表面积对CO2吸附的影响要比氮含量大得多，这一点在273 K和298 K处的标准化回归系数较高。进一步的中介分析表明，氮气对CO2吸附的影响主要是通过对表面积的修饰间接发生的，其中介比例分别为70.1 %和58.2% %。对氮掺杂和未掺杂碳的比较评估支持了这些发现，表明无论氮掺入与否，表面面积和CO2吸附能力之间都存在一致的正相关关系。这些结果提供了定量证据，表明结构发育和表面可及性在CO2捕获中比氮功能起更决定性的作用。本文获得的见解为先进碳基CO2吸附剂的合理设计和未来的机器学习优化奠定了数据驱动的基础。

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引用次数: 0

Band-edge alignment in ultra-narrow InAs1-xSbx photocathodes enabling selective solar-driven CO2-to-liquid conversion 超窄InAs1-xSbx光电阴极的带边对准实现了选择性太阳能驱动的二氧化碳到液体的转换

IF 8.4 2区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization

Pub Date : 2026-01-08 DOI: 10.1016/j.jcou.2026.103314

Hoki Son , Seungwan Woo , Eungbeom Yeon , Hyegyeong Hwang , Eunbee Jung , Daehwan Jung , Ho Won Jang , Won Jun Choi , Jinsung Kwak

Selective photoelectrochemical CO₂ reduction technologies typically rely on wide-bandgap semiconductors, which provide sufficient photovoltage but low solar utilization. In this study, we demonstrate that the absolute band-edge alignment, rather than the bandgap size, governs CO₂ reduction selectivity in the ultra-narrow-bandgap (<0.5 eV) InAs_1-xSb_x photocathode. Single-phase zinc-blende alloys with tunable conduction and valence band positions, while maintaining high carrier mobility, are obtained via molecular beam epitaxy. Under 1-sun irradiation in CO₂-saturated bicarbonate, intermediate compositions (x ≈ 0.5–0.7) achieve a Faradaic efficiency of ∼70 % for C₁–C₂ oxygenates at −0.7 V vs. RHE, while suppressing H₂ evolution by a factor of more than 10 compared to InAs. UV photoelectron spectroscopy and DFT calculations reveal that antimony incorporation shifts both the conduction and valence band edges toward vacuum, thereby weakening H* adsorption and modulating interfacial energetics to favor multi-electron CO₂ reduction. This study presents a practical design framework that demonstrates how ultra-narrow-bandgap III–V alloys can enable efficient and selective CO₂-to-liquid conversion when their band alignment and surface energetics are precisely engineered.

选择性光电化学CO2还原技术通常依赖于宽带隙半导体，其提供足够的光电压，但太阳能利用率低。在这项研究中，我们证明了绝对带边对准，而不是带隙大小，在超窄带隙（<0.5 eV） InAs1-xSbx光电阴极中控制CO2还原选择性。通过分子束外延获得了具有可调导电性和价带位置的单相锌-闪锌矿合金，同时保持了较高的载流子迁移率。在1个太阳照射下，在co2饱和碳酸氢盐中，中间成分（x ≈ 0.5-0.7）与RHE相比，在−0.7 V下，C1-C2氧合物的法拉第效率为~ 70 %，同时与InAs相比，抑制H₂演化的因子超过10倍。紫外光电子能谱和DFT计算表明，锑的掺入使导价带边缘向真空方向移动，从而减弱H*吸附，调节界面能量，有利于多电子CO2还原。这项研究提出了一个实用的设计框架，展示了超窄带隙III-V合金如何在其能带对准和表面能量学精确设计时实现高效和选择性的二氧化碳到液体的转化。

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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 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization

Pub Date : 2026-01-06 DOI: 10.1016/j.jcou.2025.103311

Hanieh Habibpoor, Majid Taghizadeh

The oxidative dehydrogenation (ODH) of propane using CO₂ 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 CO₂-ODP. Comprehensive physicochemical characterization-including XRD, FT-IR, SEM, EDX elemental mapping, HRTEM, N₂ physisorption, H₂-TPR, NH₃-TPD, CO₂-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^6 + 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 (

E_{a p p}^{c a t}

= 83.98 kJ·mol⁻¹) indicates that the dehydrogenation proceeds rapidly and more easily in the presence of this catalyst.

使用CO2作为软氧化剂对丙烷进行氧化脱氢（ODH）是一种很有前途的选择性丙烯生产策略，同时还能有效地使CO₂增值，强调了对高活性和稳定催化剂的迫切需求。本研究以三维介孔二氧化硅KIT-6为载体，采用初湿浸渍法合成了一系列cr基催化剂，其载铬量为3 ~ 10 wt%。采用锌促进法对催化剂进行进一步改性，提高了催化剂在CO2-ODP中的催化性能。综合理化表征——包括XRD、FT-IR、SEM、EDX元素图、HRTEM、N2物理吸附、H2-TPR、NH3-TPD、CO2-TPD、XPS、Raman和tga——证实了KIT-6在金属浸渍后仍保持有序的三维介孔结构，有利于氧化铬的优异分散。制备的催化剂中，7 %Cr/KIT-6具有最佳的丙烷转化率和丙烯选择性。锌的促进作用显著增强了铬载体的相互作用，提高了高氧化性Cr6 +的表面浓度，这对丙烷脱氢反应的催化活性起着至关重要的作用。1.5 %Zn-7 %Cr/KIT-6催化剂在550℃时表现出优异的性能，丙烷转化率为50.7% %，丙烯选择性和产率分别为79.9% %和40.5 %。基于Langmuir-Hinshelwood模型的动力学研究有效地描述了催化剂上的反应机理。表观活化能（Eappcat = 83.98 kJ·mol−1）表明，在该催化剂的存在下，脱氢反应进行得更快、更容易。

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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 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization

Pub 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

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 Cu₂O 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 C₂ 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⁻². 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.

电化学CO还原反应为一氧化碳转化为多碳产物提供了一种可持续的方法，但控制C-C耦合仍然是一个挑战。在此，我们设计了一种Z-Cu电催化剂，通过在纳米Cu2O表面涂覆ZIF-8，实现了电子结构和表面润湿性的界面调制。结构分析证实了强的Cu-Zn相互作用，而电化学测量表明，在低电流密度下，Z-Cu有利于C2产物。实验和DFT计算均表明，Z-Cu通过疏水斥力和位阻抑制*CO加氢成*COH，从而抑制了不对称*CO-*COH生成*OCCOH的途径。相反，Z-Cu主要促进了对称的*CO-*CO耦合。在50 mA cm−2时，Z-Cu的最佳增强因子为5.5。这项工作强调了疏水性和界面电子调制在指导CORR途径中的决定性作用，为推进cu基催化剂向高效多碳燃料和化学品生产方向发展提供了新的机制见解和可推广的设计原则。

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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 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization

Pub Date : 2026-01-06 DOI: 10.1016/j.jcou.2025.103309

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

The use of CO₂/H₂ for amine N-methylation provides a green and sustainable pathway for CO₂ 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 CO₂/H₂. When the molar ratio of NaBH₄/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_H2/P_CO2 = 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 Cu⁰-Cu⁺-Cu²⁺ and their synergistic interaction with the Cr–oxo clusters facilitated the high activity of Cu@MIL-101(Cr). Control experiments indicated that CO₂ activated on the Cu⁺ and O²⁻ of the Cr–oxo clusters preferentially reacts with the AN adsorbed on adjacent Cu²⁺ and unsaturated Cr³⁺ sites, forming a phenylcarbamic acid intermediate. This intermediate is subsequently stepwise hydrogenated to MA by spillover H* atoms dissociated on neighboring Cu⁰ sites.

利用CO2/H2进行胺n -甲基化为CO2利用和n -甲胺的生产提供了一条绿色可持续的途径。然而，先进催化剂的研究仍然面临着挑战。在这里，我们将超小的Cu纳米颗粒限制在MIL-101中，用CO2/H2催化胺的n -甲基化。当NaBH4/Cu的摩尔比为2:1时，5 %Cu@MIL-101（Cr）催化剂表现出优异的催化性能和循环稳定性。以环己烷为溶剂，在4 MPa （PH2/PCO2 = 3）、200℃、8 h条件下，苯胺（AN）的转化率达到94.8 %，对甲基苯胺（MA）的选择性为93.1 %。由于MOF笼的约束作用，反应后催化剂中未观察到明显的Cu颗粒团聚现象。Cu0-Cu+-Cu2+的共存及其与Cr - oxo簇的协同作用促进了Cu@MIL-101（Cr）的高活性。对照实验表明，在Cr-oxo簇上活化的CO2优先与吸附在相邻Cu2+和不饱和Cr3+位点上的AN反应，生成苯氨基甲酸中间体。这种中间体随后通过在邻近的Cu0位点上解离的H*原子溢出逐步氢化成MA。

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引用次数: 0

Strategic prioritization of carbon capture and utilization pathways for Saudi Arabia’s circular carbon economy 沙特阿拉伯循环碳经济碳捕集利用路径的战略优先顺序

IF 8.4 2区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization

Pub Date : 2026-01-06 DOI: 10.1016/j.jcou.2025.103307

Naser Odeh , Julian David Hunt , Faisal Ibrahim Bin Salem , Mohamad Hejazi , Yoshihide Wada

As global leader in fossil fuel production, Saudi Arabia must balance economic growth with its decarbonization activities. This study assesses various CO₂ utilization pathways aligned with Saudi Vision 2030 and the Circular Carbon Economy, using a multi-criteria decision analysis framework to rank options by maturity, scalability, cost, sequestration potential, and policy fit. Among 9 assessed pathways, CCU for construction materials, such as concrete curing and carbonated aggregates rank highest due to their high technology readiness level (TRL 8–9), economic scalability, and potential for permanent CO₂ sequestration. It is estimated that around 4.7 Mt CO₂/y can be utilized in existing concrete plants across the Kingdom by 2030 with retrofitting costs of around $0.5 M to 1.5 M per site. Our analysis highlights that CO₂-derived fuels like synthetic methane and sustainable aviation fuels offer long-term decarbonization potential, especially when combined with DAC or biogenic CO₂ for net-negative emissions. However, they face challenges such as high energy demand, infrastructure needs, and abatement costs of $430–$650 per tonne of CO₂. Chemical conversion routes (e.g., formic acid, DMC, polyols, cyclic carbonates) have moderate maturity (TRL 4–6) and require substantial R&D investment. Though aligned with Vision 2030, their high costs and carbon leakage risks limit short-term viability. Algae-based utilization offers up to 2 tCO₂ sequestered per tonne of biomass but remains in early stages. Despite these challenges, Saudi Arabia has the potential to lead regionally in CCU by leveraging its industrial base, low-cost renewables, and policy momentum to advance impactful circular carbon solutions.

作为全球化石燃料生产的领导者，沙特阿拉伯必须在经济增长与脱碳活动之间取得平衡。本研究评估了与沙特2030年愿景和循环碳经济相一致的各种二氧化碳利用途径，使用多标准决策分析框架根据成熟度、可扩展性、成本、封存潜力和政策契合度对各种选择进行排名。在9个评估的途径中，建筑材料的CCU，如混凝土养护和碳化骨料，由于其高技术成熟度（TRL 8-9），经济可扩展性和永久二氧化碳封存的潜力，排名最高。据估计，到2030年，沙特王国现有的混凝土工厂每年可利用约470万吨二氧化碳，每个工厂的改造成本约为0.5 万美元至1.5 万美元。我们的分析强调，二氧化碳衍生燃料（如合成甲烷和可持续航空燃料）具有长期脱碳潜力，特别是与DAC或生物源二氧化碳结合使用时，可实现净负排放。然而，他们面临着诸如高能源需求，基础设施需求以及每吨二氧化碳430至650美元的减排成本等挑战。化学转化途径（如甲酸、DMC、多元醇、环状碳酸盐）成熟度中等（TRL 4-6），需要大量的研发投资。尽管符合《2030愿景》，但它们的高成本和碳泄漏风险限制了短期可行性。以藻类为基础的利用每吨生物质可封存高达2吨的二氧化碳，但仍处于早期阶段。尽管存在这些挑战，沙特阿拉伯仍有潜力通过利用其工业基础、低成本可再生能源和政策动力来推进有影响力的循环碳解决方案，在CCU领域处于地区领先地位。

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引用次数: 0