Journal of CO2 Utilization最新文献_第8页

Synergistic chemo-enzymatic formic acid disproportionation and biomolecular condensates for efficient amino acid production 协同化学-酶甲酸歧化和高效氨基酸生产的生物分子凝聚

IF 8.4 2区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization

Pub Date : 2025-11-05 DOI: 10.1016/j.jcou.2025.103269

Aocong Guan , Yin Gao , Minhui Wang , Jinglei Nie , Jianming Liu , An-Ping Zeng

Formic acid, which can be sustainably produced from CO₂ electroreduction, serves as a renewable liquid C₁ carrier for carbon recycling. However, its biological assimilation is fundamentally constrained by unfavorable thermodynamics and limited metabolic flux. Here, we develop an artificial and efficient pathway to transform formic acid into amino-acid glycine through integrating non-enzymatic formic acid disproportionation with biomolecular condensate-mediated enzyme organization, overcoming these limitations. We first employed amorphous bismuth chromate hydroxide to catalyze formic acid disproportionation, and investigated how amorphous catalyst impacts efficiency, finding that amorphous bismuth chromate hydroxide yield substantially higher catalytic activity and enable the production of formaldehyde at M concentrations alongside CO₂ from formic acid. This chemical step provides a strong thermodynamic driving force for subsequent enzymatic glycine synthesis. Furthermore, we employed liquid-liquid phase separation (LLPS) to create biomolecular condensates, spatially organizing enzymes like natural carboxysomes to enhance catalytic efficiency. This hybrid chemical-biological strategy enables thermodynamically favorable, high-flux glycine production, offering a paradigm for transcending biological thermodynamic constraints through abiotic-biotic synergy coupling with engineered enzyme compartmentalization.

甲酸是一种可再生的液态C₁载体，可通过CO₂电还原可持续生产。然而，它的生物同化从根本上受到不利的热力学和有限的代谢通量的限制。本研究通过将非酶甲酸歧化与生物分子凝聚物介导的酶组织相结合，开发了一种将甲酸转化为氨基酸甘氨酸的人工高效途径，克服了这些局限性。我们首先使用无定形氢氧化铬酸铋催化甲酸歧化，并研究了无定形催化剂对效率的影响，发现无定形氢氧化铬酸铋的催化活性大大提高，并且可以在M浓度下与CO 2一起从甲酸中生成甲醛。这一化学步骤为后续的酶促甘氨酸合成提供了强大的热力学驱动力。此外，我们采用液-液相分离（LLPS）技术创建生物分子凝聚体，在空间上组织酶，如天然羧体，以提高催化效率。这种化学-生物混合策略可以实现热力学有利的高通量甘氨酸生产，为通过非生物-生物协同作用与工程酶区隔化耦合超越生物热力学约束提供了范例。

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引用次数: 0

Valorization of carbon dioxide via the organic electro-refinery concept: Demonstrating the feasibility of a sustainable process 通过有机电精炼厂概念实现二氧化碳的增值：展示可持续过程的可行性

IF 8.4 2区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization

Pub Date : 2025-11-04 DOI: 10.1016/j.jcou.2025.103265

S. Maldonado , R. Garcia-Cervilla , G. Roa-Morales , R. Natividad , J. Lobato , M.A. Rodrigo

In this study, we present a successful demonstration of carbon dioxide transformation into carboxylate-rich solutions through a sequential process integrating biological and electrochemical technologies. The process comprises three main stages: (1) CO₂ fixation via algal cultivation, (2) electrochemical conversion of the algal biomass into carboxylates, and (3) separation and purification of the resulting acids using electrodialysis. Each stage was systematically evaluated to determine process efficiency and yield. First, atmospheric CO₂ was effectively fixed into algal biomass at varying cell retention times (2–10 days), with a 5-day retention time yielding the highest productivity, up to 37.65 mg day⁻¹ at an air flow rate of 4.1 L h⁻¹ . Shorter retention times led to biomass washout, limiting fixation efficiency. Second, the algal biomass was electrochemically transformed into carboxylate-containing solutions. The formation of these compounds followed a bimodal distribution: an initial release of native carboxylates from the algal matrix, followed by electrolytic generation via oxidation of organic matter, consistent with the organic electro-refinery concept. Acetate and malonate were predominantly associated with the first phase, while formate and oxalate were linked to the second. Finally, carboxylates were successfully recovered using electrodialysis with anion-exchange membranes. Recovery efficiency was strongly influenced by the applied current density, with up to 60 % of the carbon introduced via the algal suspension recovered as purified carboxylate solutions. These findings demonstrate the technical feasibility and promise of a fully solar-powered, integrated biological-electrochemical platform for CO₂ valorization, offering a novel and sustainable pathway for climate change mitigation.

在这项研究中，我们展示了通过结合生物和电化学技术的顺序过程将二氧化碳转化为富含羧酸盐的溶液的成功演示。该过程包括三个主要阶段：(1)通过藻类培养固定CO 2；(2)将藻类生物质电化学转化为羧酸；(3)使用电渗析分离和纯化所得酸。每个阶段都进行了系统评估，以确定工艺效率和收率。首先，在不同的细胞保留时间（2-10天）下，大气中的二氧化碳被有效地固定在藻类生物量中，5天的保留时间产生最高的生产力，高达37.65 mg天（⁻¹ ），空气流速为4.1 L h⁻¹ 。较短的滞留时间导致生物量流失，限制了固定效率。其次，将藻类生物质电化学转化为含羧酸的溶液。这些化合物的形成遵循双峰分布：最初从藻类基质中释放天然羧酸盐，然后通过有机物氧化产生电解，这与有机电精炼厂的概念一致。乙酸酯和丙二酸酯主要与第一相结合，甲酸酯和草酸酯主要与第二相结合。最后，利用阴离子交换膜进行电渗析，成功回收羧酸盐。回收效率受到施加电流密度的强烈影响，通过藻类悬浮液引入的碳中高达60% %作为纯化的羧酸盐溶液回收。这些发现证明了一种完全由太阳能供电的、集成的生物电化学平台用于二氧化碳增值的技术可行性和前景，为减缓气候变化提供了一种新的、可持续的途径。

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引用次数: 0

Accelerated carbonation of ladle furnace slag: A dual approach to CO2 utilization and waste valorization in sustainable cement applications 钢包炉渣加速碳化：可持续水泥应用中二氧化碳利用和废物增值的双重途径

IF 8.4 2区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization

Pub Date : 2025-11-04 DOI: 10.1016/j.jcou.2025.103267

Farah Kaddah , Ahmed Hamdy Abdelgawad , Ludovic F. Dumée , Nahla Al Amoodi , Imad Barsoum , Ahmed Alhajaj

The cement industry contributes nearly 8 % of global anthropogenic CO₂ emissions, largely driven by energy-intensive clinker production and limestone calcination. Innovative pathways to reduce this carbon footprint are critical for meeting global climate targets. This study explores the valorization of ladle furnace slag (LFS) through accelerated CO₂ carbonation, transforming it into a reactive supplementary cementitious material (SCM) that simultaneously enhances cement performance and sequesters CO₂. LFS was exposed to 100 % CO₂ for up to 72 h, achieving a CO₂ uptake of 3.3 g per 100 g slag. Incorporation of carbonated LFS at 25 % and 50 % replacement levels in cement pastes revealed significant improvements in hydration kinetics, microstructure, mechanical strength, and durability. Microstructural characterization identified the formation of nano-crystalline CaCO₃ polymorphs, which intensified pozzolanic reactivity and particle bonding. Compared to uncarbonated slag, carbonated LFS accelerated early hydration and enhanced long term strength exhibiting a 22.8 % compressive strength increase at 64 days for 25 % replacement. Reductions were observed in water absorption (7.8 %), porosity (5.2 %), and carbonation depth (17.7 %). These results demonstrate that CO₂ carbonation pretreatment not only captures carbon but also upgrades industrial waste into a high-performance, low-carbon SCM. This dual-function strategy aligns with circular economy principles and advances sustainable cement production through CO₂ utilization.

水泥行业贡献了全球近8 %的人为二氧化碳排放量，主要是由能源密集型熟料生产和石灰石煅烧驱动的。减少碳足迹的创新途径对于实现全球气候目标至关重要。本研究探讨了钢包炉渣（LFS）通过加速CO₂碳化的增值，将其转化为一种活性补充胶凝材料（SCM），同时提高水泥性能和封存CO₂。LFS暴露在100 % CO₂中长达72 h，每100 g炉渣的CO₂吸收率为3.3 g。在水泥浆中掺入25% %和50% %替代水平的碳化LFS，可以显著改善水化动力学、微观结构、机械强度和耐久性。微观结构表征发现纳米晶CaCO₃多晶态的形成，增强了火山灰反应性和颗粒键合。与未碳化的矿渣相比，碳化后的矿渣加速了早期水化，并提高了长期强度，在置换25% %的矿渣64天后，其抗压强度提高了22.8% %。吸水率（7.8 %）、孔隙率（5.2 %）和碳化深度（17.7 %）均有所降低。这些结果表明，CO₂碳化预处理不仅可以捕获碳，还可以将工业废物升级为高性能，低碳的SCM。这种双重功能战略符合循环经济原则，并通过二氧化碳的利用促进可持续水泥生产。

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引用次数: 0

Melamine-doped plastic-derived adsorbents for carbon capture: the influence of plastic type on textural properties and CO2 uptake. 用于碳捕获的三聚氰胺掺杂塑料衍生吸附剂：塑料类型对结构性能和二氧化碳吸收的影响。

IF 8.4 2区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization

Pub Date : 2025-11-03 DOI: 10.1016/j.jcou.2025.103262

Emmanuel Dan , Jake Sheriff , Alan J. McCue , Davide Dionisi , Claudia Fernández Martín

Melamine-doped adsorbents were synthesized from single PET and mixed plastics (MP) via the 2-pot method involving co-carbonisation with melamine, followed by KOH impregnation, and thermal activation. Under dynamic conditions at 25 °C and 1 bar, the PET- and MP-doped adsorbents exhibited CO₂ adsorption capacities of 1.98 and 1.59 mmol g⁻¹, respectively, representing 10.6 and 17.8 % increase over their N-free counterparts (PET: 1.79 mmol g⁻¹; MP: 1.35 mmol g⁻¹). This also indicates that melamine doping had a greater impact on the adsorptive properties of the material derived from mixed plastics. Both doped adsorbents also showed excellent cyclic stability, maintaining regeneration efficiencies above 85 % over ten cycles, although slightly lower than the > 90 % seen in N-free adsorbents tested under the same regeneration conditions (100 °C with 50 mL min⁻¹ of N₂). Elemental analysis revealed higher nitrogen incorporation in N-MP (1.37 wt%) than in N-PET (0.24 wt%), despite an identical added amount of melamine, suggesting more efficient N-doping in the mixed plastics compared with PET. Although doped adsorbents exhibited lower surface area, total pore volume, and micropore volume compared to their N-free versions, they showed higher ultra-micropore volumes, which can enhance affinity for CO₂ adsorption at the pressure tested. Lastly, the type of plastic precursor had minimal effect on the adsorption mechanism or kinetics, as all adsorbents followed the Sips isotherm and Avrami’s kinetic models.

以单个PET和混合塑料（MP）为原料，采用三聚氰胺共碳化、KOH浸渍、热活化的两锅法制备了三聚氰胺掺杂吸附剂。在25°C和1 bar的动态条件下，掺杂PET和MP的吸附剂的CO₂吸附量分别为1.98和1.59 mmol g−1，比不掺杂n的吸附剂（PET: 1.79 mmol g−1;MP: 1.35 mmol g−1）提高了10.6和17.8 %。这也表明三聚氰胺掺杂对混合塑料衍生材料的吸附性能有较大的影响。两种掺杂吸附剂也表现出优异的循环稳定性，在10个循环中保持85 %以上的再生效率，尽管略低于在相同再生条件下（100°C, 50 mL min−1 N2）测试的无n吸附剂的>； 90 %。元素分析显示，尽管三聚氰胺的添加量相同，N-MP中的氮掺入率（1.37 wt%）高于N-PET(0.24 wt%)，这表明与PET相比，混合塑料中的n掺杂效率更高。虽然与不含氮的吸附剂相比，掺杂的吸附剂的比表面积、总孔隙体积和微孔体积更小，但它们的超微孔体积更高，这可以增强压力测试下对CO₂的吸附能力。最后，塑料前驱体的类型对吸附机理或动力学的影响很小，因为所有吸附剂都遵循Sips等温线和Avrami的动力学模型。

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引用次数: 0

Reactive dyeing of flax fabric using supercritical carbon dioxide with organic bases 超临界二氧化碳与有机碱对亚麻织物的活性染色

IF 8.4 2区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization

Pub Date : 2025-11-03 DOI: 10.1016/j.jcou.2025.103259

Tieming Fan, Shang Shang

The dyeing feasibility of flax fabric was investigated with organic bases utilizing a pyrimidine-base reactive dye in supercritical carbon dioxide (Sc-CO₂). Effects of organic base, pickup rate, temperature, pressure, time, and concentration of organic base on the color strength (K/S) and fixation rates of the flax fabric were investigated. The results illustrated that successful dyeing was achieved due to the nucleophilic substitution reaction of difluoro monochloro pyrimidine group in Reactive Dark Blue KM-GR and hydroxyl functional groups in flax. K/S values of the dyed flax samples were enhanced when the dyeing parameters changed. An optimized dyeing procedure of flax fabrics was suggested with a pickup of 100 %, a temperature of 90 ℃, a pressure of 18 MPa, a time of 90 min, and an organic base concentration of 10 g/L in Sc-CO₂. Additionally, the colorfastness of the dyed samples, including rubbing, washing, and light valued over 5 was presented. In general, this work combines the synergistic advantages of fabric pre-treatment and Sc-CO₂ dyeing to explore a green dyeing process with low water consumption and high dye uptake.

以一种嘧啶基活性染料为原料，研究了有机碱在超临界二氧化碳（Sc-CO2）中对亚麻织物染色的可行性。考察了有机碱、起绒率、温度、压力、时间和有机碱浓度对亚麻织物色强（K/S）和固绒率的影响。结果表明，活性深蓝KM-GR中的二氟一氯嘧啶基团与亚麻中的羟基官能团发生亲核取代反应，可成功染色。染色后亚麻样品的K/S值随染色参数的变化而增大。提出了亚麻织物染色的最佳工艺条件：上染率为100% %，温度为90 ℃，压力为18 MPa，时间为90 min， Sc-CO2中有机碱浓度为10 g/L。此外，还介绍了染色样品的色牢度，包括摩擦，洗涤和光照值超过5。总的来说，本工作结合了织物前处理和Sc-CO2染色的协同优势，探索了一种低用水量、高染料吸收率的绿色染色工艺。

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引用次数: 0

Feasibility study for developing bacteria-based carbon-neutral mortar-Evaluation of bacterial CO2 capture performance 开发细菌基碳中性砂浆的可行性研究——细菌CO2捕获性能评价

IF 8.4 2区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization

Pub Date : 2025-11-03 DOI: 10.1016/j.jcou.2025.103264

Min-Hee Won , Ji-Won Hwang , Keun-Hyeok Yang , Sang-Seob Lee

This study explores the feasibility of a novel bacteria-based mortar and concrete capable of capturing atmospheric CO₂ throughout their service life without additional facilities. Isolated bacterial strains–Rhodopseudomonas palustris, Sphingobacterium multivorum, and Lysinibacillus sphaericus–were immobilized on porous expanded vermiculite to preserve viability under the extreme conditions of hardened concrete. The immobilized bacteria exhibited robust CO₂ uptake under diverse exposure conditions, including light/dark cycles, relative humidity from 60 % to 99 %, and temperatures ranging from 5 °C to 35 °C. Even at 5 °C, CO₂ capture performance was maintained at more than 42 % of that achieved at 20–35 °C. The bacteria-immobilizing expanded vermiculites outperformed biochar specimens, exhibiting significantly higher CO₂ capture capacities and a much faster rate of CO₂ sequestration, even at the exposure temperature of 5 °C. Viable cell counts confirmed bacterial populations increased by 2.3–3.3 times after CO₂ exposure, indicating continued growth and activity. These findings establish a scientific basis for integrating living bacterial systems into construction materials as a pathway toward carbon-neutrality. Future research will focus on developing biological mortars, evaluating their mechanical and durability properties, and ensuring environmental safety. The proposed approach offers a promising direction for transforming concrete into a sustainable material capable of active CO₂ capture, potentially revolutionizing the construction industry’s role in climate change mitigation.

本研究探索了一种新型细菌基砂浆和混凝土的可行性，该砂浆和混凝土能够在其整个使用寿命内捕获大气中的二氧化碳，而无需额外的设施。孤立的细菌strains-Rhodopseudomonas palustris, Sphingobacterium multivorum, Lysinibacillus sphaericus-were固定在多孔膨胀蛭石保护生存的极端条件下硬化混凝土。在不同的暴露条件下，包括光照/黑暗循环，相对湿度为60% %至99 %，温度为5°C至35°C，固定化细菌表现出强劲的二氧化碳吸收。即使在5°C时，CO2捕获性能也保持在20-35°C时的42% %以上。细菌固定化膨胀蛭石的性能优于生物炭样品，即使在5°C的暴露温度下，也表现出更高的CO2捕获能力和更快的CO2固存速度。活细胞计数证实，CO2暴露后细菌数量增加了2.3-3.3倍，表明持续生长和活动。这些发现为将活细菌系统整合到建筑材料中作为实现碳中和的途径奠定了科学基础。未来的研究将集中在开发生物砂浆、评估其力学和耐久性以及确保环境安全等方面。提出的方法为将混凝土转化为能够主动捕获二氧化碳的可持续材料提供了一个有希望的方向，可能会彻底改变建筑行业在减缓气候变化方面的作用。

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引用次数: 0

Assessment of process conditions in the dry reforming of HDPE fast pyrolysis volatiles for syngas production HDPE快热解挥发物干法重整合成气工艺条件评价

IF 8.4 2区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization

Pub Date : 2025-10-31 DOI: 10.1016/j.jcou.2025.103258

Leire Olazar , Laura Santamaria , Martin Olazar , Maider Amutio , Gartzen Lopez , Maite Artetxe

The joint valorization of CO₂ and high density polyethylene (HDPE) has been carried out by means of a two-stage process consisting of plastic fast pyrolysis and in-line dry reforming. The first step of pyrolysis was carried out in a conical spouted bed reactor (CSBR) by feeding plastics continuously and the volatiles formed were reformed in a second catalytic fluidized bed reactor (FBR), in which Ni commercial methane reforming catalyst has been used. The effect of reforming temperature (600–700 °C), space time (2–25 g_cat min g_HDPE⁻¹) and CO₂/C molar ratio (1−2) on the conversions of HDPE and CO₂ has been analyzed. Furthermore, their influence on the yield of carbon containing products and H₂ production has been analyzed. Thus, an increase in temperature and space time favors HDPE and CO₂ conversion, reaching full HDPE pyrolysis volatiles conversion into gaseous products at temperatures above 650 °C, with a space time of 20 g_cat min g_HDPE⁻¹ and CO₂/C molar ratio of 1.5. Nevertheless, although an increase in CO₂/C molar ratio enhances HDPE conversion, it also leads to CO₂ conversion decrease due to excess CO₂ in the feed. In fact, an increase in all variables above the values corresponding to full conversion of HDPE enhances the reverse Water Gas Shift (WGS) reaction, and therefore increases the conversion of CO₂ to the detriment of H₂ production. Thus, a maximum H₂ production of 0.08 g_H2 g_HDPE⁻¹ has been obtained at 650 °C with a space time of 25 g_cat min g_HDPE⁻¹ and CO₂/C molar ratio of 1.5, attaining a syngas production of 4.7 g_syngas g_HDPE⁻¹.

采用塑料快速热解和在线干重整两段工艺对CO2和高密度聚乙烯（HDPE）进行了联合增值。第一步热解在锥形喷淋床反应器（CSBR）中连续进料进行，挥发分在第二催化流化床反应器（FBR）中进行转化，第二催化流化床反应器采用Ni工业甲烷转化催化剂。分析了重整温度（600 ~ 700℃）、空时（2 ~ 25 gcat min gHDPE−1）和CO2/C摩尔比（1−2）对HDPE和CO2转化的影响。进一步分析了它们对含碳产物收率和H2产率的影响。因此，温度和空间时间的增加有利于HDPE和CO2的转化，在650℃以上的温度下，gHDPE−1的空间时间为20 gcat min， CO2/C摩尔比为1.5，达到HDPE热解挥发物完全转化为气态产物。然而，尽管CO2/C摩尔比的增加提高了HDPE转化率，但由于进料中过量的CO2，也会导致CO2转化率降低。事实上，高于HDPE完全转化对应值的所有变量的增加都增强了反向水气转换（WGS）反应，从而增加了CO2的转化，从而损害了H2的产生。因此，在650°C、25 gcat min gHDPE - 1、CO2/C摩尔比为1.5的条件下，H2的最大产量为0.08 gH2 gHDPE - 1，合成气产量为4.7 gsyngas gHDPE - 1。

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引用次数: 0

Analysis of CO2 emissions from natural gas-fired power plants and an emission control strategy 天然气发电厂二氧化碳排放分析及排放控制策略

IF 8.4 2区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization

Pub Date : 2025-10-31 DOI: 10.1016/j.jcou.2025.103256

Mustafizur Rahman , Faijunnesa Rashid

The quantification, prediction, and reduction strategies of CO₂ emissions are essential for their negative impacts on health, the environment, and the global climate. This study analyzed CO₂ emissions from Engine-based Natural gas-fired power plants and forecasted CO₂ emissions. To quantify, analyze, and predict CO₂ emissions using Error, Trend, and Seasonal (ETS), Trigonometric seasonality, Box-Cox transformation, ARMA errors, Trend and Seasonal components (TBATS), Auto-Regressive Integrated Moving Average (ARIMA), Holt, Holt-Winters and Extreme Learning Machine (ELM) modeling approaches have been adapted and selected the best model among them based on CO₂ emissions data from natural gas-fired power plants. This paper introduced a new idea to reduce emissions by using exhaust to generate electricity. This study investigated the contribution of Exhaust Gas Boilers (EGB) to CO₂ emission reductions and found in engine based Natural Gas fired power plants, it reduces on average 0.8–10 % of CO₂ emissions using Waste Heat Recovery (WHR), and this reduction is dependent on engine load, but waste air or exhaust is still released into the atmosphere. This paper introduces a conceptual framework for Waste Air Recovery (WAR), a forward-looking approach that proposes utilizing post-EGB exhaust air in turbine systems for further efficiency gains and emissions reduction. While not evaluated empirically in this study, WAR is presented as a potential direction for future research.

二氧化碳排放的量化、预测和减少战略对其对健康、环境和全球气候的负面影响至关重要。本研究分析了以发动机为基础的天然气发电厂的二氧化碳排放量，并预测了二氧化碳排放量。利用误差、趋势和季节（ETS）、三角季节性、Box-Cox变换、ARMA误差、趋势和季节分量（TBATS）、自回归综合移动平均（ARIMA）、Holt、Holt- winters和极限学习机器（ELM）建模方法对二氧化碳排放进行量化、分析和预测，并根据天然气发电厂的二氧化碳排放数据从中选择最佳模型。本文介绍了一种利用废气发电来减少排放的新思路。本研究调查了废气锅炉（EGB）对二氧化碳减排的贡献，发现在以发动机为基础的天然气发电厂，使用废热回收（WHR）平均减少0.8-10 %的二氧化碳排放，这种减少取决于发动机负载，但废气或废气仍然释放到大气中。本文介绍了废气回收（WAR）的概念框架，这是一种前瞻性的方法，建议在涡轮系统中利用egb后废气来进一步提高效率和减少排放。虽然在本研究中没有进行实证评估，但WAR被认为是未来研究的一个潜在方向。

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引用次数: 0

Impact of fluctuating temperature and pressure of injected CO2 on adsorption performance in a packed-bed reactor: A CFD-based study 注入二氧化碳的温度和压力波动对填充床反应器吸附性能的影响：基于cfd的研究

IF 8.4 2区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization

Pub Date : 2025-10-29 DOI: 10.1016/j.jcou.2025.103253

Ali M. Sefidan, Jari Vepsäläinen

This study investigates the influence of oscillatory inlet conditions on CO

_{2}

adsorption performance and energy efficiency in a packed-bed reactor using Computational Fluid Dynamics (CFD) modelling. Baseline operating values of 3 bar and 20 °C were selected as representative conditions, and systematic oscillations in pressure (

A_{P} = \pm 0.2

to 2 bar) and temperature (

A_{T} = \pm 2

to 10 °C) were imposed at frequencies of 0.001 to 0.01 Hz. Three forcing patterns – snusoidal, triangular, and step changes – were considered and compared to steady operation. The results show that pressure oscillations dominate the dynamic adsorption response: large amplitudes (

\pm

2 bar) reduce average CO

_{2}

uptake by up to 16% and increase specific energy consumption by 18% relative to steady-state. Temperature oscillations alone have negligible impact under the present baseline, as symmetric forcing cancels over each cycle; however, when temperature oscillations are coupled with pressure swings, they significantly affect the cooling energy load. Among waveform types, triangular oscillations achieve the most favourable balance of adsorption performance and energy demand, while step changes lead to the poorest efficiency. Overall, the findings demonstrate that oscillatory injection conditions generally reduce adsorption performance, with pressure fluctuations exerting the strongest influence, underscoring the importance of pressure-stabilizing strategies for efficient CO

_{2}

capture.

利用计算流体动力学（CFD）模型研究了振荡进口条件对填料床反应器CO2吸附性能和能效的影响。选择3 bar和20°C的基线工作值作为代表性条件，并在0.001至0.01 Hz的频率下施加压力（AP=±0.2至2 bar）和温度（AT=±2至10°C）的系统振荡。考虑了三种强迫模式——正弦、三角形和阶跃变化，并与稳定运行进行了比较。结果表明，压力振荡主导了动态吸附响应：相对于稳态，大振幅（±2 bar）可使平均二氧化碳吸收量减少16%，比能量消耗增加18%。在目前的基线下，温度振荡本身的影响可以忽略不计，因为对称强迫在每个周期内都会取消；然而，当温度波动与压力波动耦合时，它们会显著影响冷却能量负荷。在波形类型中，三角振荡达到了吸附性能和能量需求的最佳平衡，而阶跃变化导致效率最差。总体而言，研究结果表明，振荡注入条件通常会降低吸附性能，其中压力波动的影响最大，强调了压力稳定策略对有效捕获CO2的重要性。

{"title":"Impact of fluctuating temperature and pressure of injected CO2 on adsorption performance in a packed-bed reactor: A CFD-based study","authors":"Ali M. Sefidan, Jari Vepsäläinen","doi":"10.1016/j.jcou.2025.103253","DOIUrl":"10.1016/j.jcou.2025.103253","url":null,"abstract":"<div><div>This study investigates the influence of oscillatory inlet conditions on CO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> adsorption performance and energy efficiency in a packed-bed reactor using Computational Fluid Dynamics (CFD) modelling. Baseline operating values of 3 bar and 20 °C were selected as representative conditions, and systematic oscillations in pressure (<span><math><mrow><msub><mrow><mi>A</mi></mrow><mrow><mi>P</mi></mrow></msub><mo>=</mo><mo>±</mo><mspace></mspace><mn>0</mn><mo>.</mo><mn>2</mn></mrow></math></span> to 2 bar) and temperature (<span><math><mrow><msub><mrow><mi>A</mi></mrow><mrow><mi>T</mi></mrow></msub><mo>=</mo><mo>±</mo><mspace></mspace><mn>2</mn></mrow></math></span> to 10 °C) were imposed at frequencies of 0.001 to 0.01 Hz. Three forcing patterns – snusoidal, triangular, and step changes – were considered and compared to steady operation. The results show that pressure oscillations dominate the dynamic adsorption response: large amplitudes (<span><math><mo>±</mo></math></span>2 bar) reduce average CO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> uptake by up to 16% and increase specific energy consumption by 18% relative to steady-state. Temperature oscillations alone have negligible impact under the present baseline, as symmetric forcing cancels over each cycle; however, when temperature oscillations are coupled with pressure swings, they significantly affect the cooling energy load. Among waveform types, triangular oscillations achieve the most favourable balance of adsorption performance and energy demand, while step changes lead to the poorest efficiency. Overall, the findings demonstrate that oscillatory injection conditions generally reduce adsorption performance, with pressure fluctuations exerting the strongest influence, underscoring the importance of pressure-stabilizing strategies for efficient CO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> capture.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"102 ","pages":"Article 103253"},"PeriodicalIF":8.4,"publicationDate":"2025-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145412419","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

Evaporation phase transition dynamic process of liquid CO2 driven by compound heat transfer in storage tanks for mine fire prevention: A theoretical model and experimental studies 矿井防火储罐复合传热驱动液态CO2蒸发相变动力学过程：理论模型与实验研究

IF 8.4 2区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization

Pub Date : 2025-10-29 DOI: 10.1016/j.jcou.2025.103261

Shixing Fan , Yujie Peng , Yankun Ma , Jiarui Zhu , Dengke Wang , Mengru Huang , Wei Wu , Shuo Wu , Zhengdong Liu , Yukun Shi , Jiaxin Ji , Furu Kang , Hu Wen

Mining liquid CO₂ (L-CO₂) storage tanks are vulnerable to external high temperatures and deep geothermal during storage and transportation. The heat is transferred from the outer wall of the storage tank to the interior due to compound heat transfer effects. This ultimately results in the evaporation phase transition of the L-CO₂ inside the tank. The process causes the CO₂ to escape into the air, which increases the risk of asphyxiation in confined spaces for miners and dry ice freeze plugging. Therefore, it is necessary to investigate the evaporation phase transition dynamic process driven by compound heat transfer. In this study, an evaporation phase transition model of L-CO₂ was established based on heat transfer theory and CO₂ phase transition theory. Concurrently, seven types of physical simulation experiments of the evaporation phase transition dynamic process with different schemes were carried out, based on an experimental system for the evaporation phase transition of L-CO₂ that was constructed independently. The influence of ambient temperature and initial filling ratios was considered in the experimental study. On this basis, the relative errors of the theoretical calculation values and experimental data were discussed, and then the accuracy of the evaporation phase transition model was validated. The result indicates that increasing ambient temperature leads to faster rises in temperature and pressure within the L-CO₂ storage tank and extends the evaporation phase transition duration. The initial filling ratio primarily affects the initial storage period. Tanks with a lower initial filling ratio exhibit a more intense evaporation phase transition initially but with a shorter duration. The research results have vital theoretical guiding significance for scientific design and residual quantity prediction of mine L-CO₂ storage tanks.

矿用液态CO2 （L-CO2）储罐在储运过程中容易受到外界高温和深层地热的影响。由于复合传热效应，热量从储罐的外壁传递到内部。这最终导致罐内L-CO2的蒸发相变。这个过程导致二氧化碳逃逸到空气中，这增加了矿工在密闭空间窒息和干冰冻结堵塞的风险。因此，有必要对复合传热驱动下的蒸发相变动力学过程进行研究。本研究基于传热理论和CO2相变理论，建立了L-CO2的蒸发相变模型。同时，在自主构建的L-CO2蒸发相变实验系统的基础上，开展了7类不同方案的蒸发相变动态过程物理模拟实验。实验研究中考虑了环境温度和初始填充率的影响。在此基础上，讨论了理论计算值与实验数据的相对误差，验证了蒸发相变模型的准确性。结果表明：随着环境温度的升高，L-CO2储罐内温度和压力的上升速度加快，蒸发相变时间延长；初始灌装率主要影响初始储存期。初始充注比较低的储罐初始蒸发相变较剧烈，但持续时间较短。研究成果对矿山L-CO2储罐的科学设计和残留量预测具有重要的理论指导意义。

{"title":"Evaporation phase transition dynamic process of liquid CO2 driven by compound heat transfer in storage tanks for mine fire prevention: A theoretical model and experimental studies","authors":"Shixing Fan , Yujie Peng , Yankun Ma , Jiarui Zhu , Dengke Wang , Mengru Huang , Wei Wu , Shuo Wu , Zhengdong Liu , Yukun Shi , Jiaxin Ji , Furu Kang , Hu Wen","doi":"10.1016/j.jcou.2025.103261","DOIUrl":"10.1016/j.jcou.2025.103261","url":null,"abstract":"<div><div>Mining liquid CO<sub>2</sub> (L-CO<sub>2</sub>) storage tanks are vulnerable to external high temperatures and deep geothermal during storage and transportation. The heat is transferred from the outer wall of the storage tank to the interior due to compound heat transfer effects. This ultimately results in the evaporation phase transition of the L-CO<sub>2</sub> inside the tank. The process causes the CO<sub>2</sub> to escape into the air, which increases the risk of asphyxiation in confined spaces for miners and dry ice freeze plugging. Therefore, it is necessary to investigate the evaporation phase transition dynamic process driven by compound heat transfer. In this study, an evaporation phase transition model of L-CO<sub>2</sub> was established based on heat transfer theory and CO<sub>2</sub> phase transition theory. Concurrently, seven types of physical simulation experiments of the evaporation phase transition dynamic process with different schemes were carried out, based on an experimental system for the evaporation phase transition of L-CO<sub>2</sub> that was constructed independently. The influence of ambient temperature and initial filling ratios was considered in the experimental study. On this basis, the relative errors of the theoretical calculation values and experimental data were discussed, and then the accuracy of the evaporation phase transition model was validated. The result indicates that increasing ambient temperature leads to faster rises in temperature and pressure within the L-CO<sub>2</sub> storage tank and extends the evaporation phase transition duration. The initial filling ratio primarily affects the initial storage period. Tanks with a lower initial filling ratio exhibit a more intense evaporation phase transition initially but with a shorter duration. The research results have vital theoretical guiding significance for scientific design and residual quantity prediction of mine L-CO<sub>2</sub> storage tanks.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"102 ","pages":"Article 103261"},"PeriodicalIF":8.4,"publicationDate":"2025-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145412414","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