Advanced Powder Technology最新文献_第5页

Thermochemical heat storage performance of MgO/Mg(OH)2 particles in a fluidized bed 流化床中MgO/Mg(OH)2颗粒的热化学储热性能

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-11-21 DOI: 10.1016/j.apt.2025.105125

Naoya Shirota , Masahiro I. Aoki , Takuto Aoki , Chihiro Fushimi

For rapid heat discharge of a thermochemical energy storage system, we investigated the temperature profiles of MgO/Mg(OH)₂ during hydration in a fluidized bed by varying the steam partial pressure (50‒90 vol%), inlet gas temperature (110‒150 °C), fluidization number (2‒4 times of minimum fluidization velocity), and particle diameter (90‒180, 250‒350, and 350‒500 μm). The heat discharge temperature of MgO increased with increasing steam partial pressure and decreasing fluidizing gas velocity. The bed temperature rapidly increased within 1 min of steam supply owing to exothermic hydration. The bed temperature rapidly decreased, stabilized for several minutes, and then progressively decreased. The optimal conditions for high-efficiency heat-discharge storage were determined to be (1) an inlet gas temperature of 110 °C, (2) a fluidization number of 2, and (3) particle sizes of 350‒500 or 250‒350 μm (Geldart Group B particles) under these experimental conditions. For the same fluidization number, the particle size did not have a significant effect on the heat discharge performance unless the particles were elutriated from the reactor. The heat storage and discharge cycles (i = 10) decreased the particle size from 460 to 280 µm, the maximum temperature of the fluidized bed from 168 to 145 °C, and the conversion of MgO during hydration from 71 to 60 mol%.

为了实现热化学储能系统的快速放热，研究了流化床水化过程中MgO/Mg(OH)2的温度分布，包括蒸汽分压（50-90 vol%）、入口气体温度（110-150°C）、流化数（最小流化速度的2 - 4倍）和颗粒直径（90-180、250-350和350-500 μm）。MgO的放热温度随着蒸汽分压的增大和流化气速的减小而升高。由于放热水化作用，床层温度在供汽后1 min内迅速升高。床温迅速下降，稳定几分钟后逐渐下降。实验确定了高效蓄热的最佳条件为：(1)进口气体温度为110℃，(2)流态化数为2，(3)颗粒尺寸为350 ~ 500 μm或250 ~ 350 μm （Geldart Group B颗粒）。对于相同的流化数，颗粒大小对热排放性能没有显著影响，除非颗粒从反应器中被洗脱。储放循环次数（i = 10）使颗粒粒径从460µm降低到280µm，流化床最高温度从168℃降低到145℃，水化过程中MgO的转化率从71 mol%降低到60 mol%。

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引用次数: 0

Atomic-scale mechanisms of femtosecond laser double-pulse sintering in Cu nanoparticles: A multiscale simulation study 飞秒激光双脉冲烧结铜纳米粒子的原子尺度机制：多尺度模拟研究

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-11-20 DOI: 10.1016/j.apt.2025.105113

Yuzun Huang , Weiyong Tang , Ze Yu , Xiaochuan Xu , Feng He

Femtosecond laser sintering offers a promising route for fabricating Cu-based micro- and nano-devices, yet optimizing processing conditions to balance sintering efficiency with minimal thermal damage remains challenging. In this study, a comprehensive multi-scale investigation of dual-pulse femtosecond laser sintering of Cu nanoparticles is presented using a combined molecular dynamics and two-temperature model (MD-TTM) simulation framework. Initially, the nanoscale melting point was determined under both slow and rapid heating conditions, revealing a reduction compared to bulk copper due to size effects. Subsequent simulations explored the effects of inter-pulse delay and energy distribution on electron–lattice energy coupling and sintering kinetics. Our results indicate that, within a critical delay threshold (approximately 30 ps), dual-pulse processing can synergistically regulate electron temperature, suppress thermionic emission, and accelerate neck formation. Furthermore, by comparing different energy injection schemes, we found that while a high-low energy combination improves processing speed, an equal energy ratio yields the best overall balance between electron temperature control and morphological evolution. These findings provide theoretical guidance for tailoring dual-pulse laser parameters, offering enhanced process controllability and improved material quality for advanced laser sintering applications.

飞秒激光烧结为制造铜基微纳米器件提供了一条很有前途的途径，但优化加工条件以平衡烧结效率和最小的热损伤仍然是一个挑战。在本研究中，采用分子动力学和双温度模型（MD-TTM）相结合的模拟框架，对双脉冲飞秒激光烧结纳米铜颗粒进行了全面的多尺度研究。最初，纳米级熔点在慢速和快速加热条件下都被确定，与大块铜相比，由于尺寸效应，熔点有所降低。随后的模拟探讨了脉冲间延迟和能量分布对电子-晶格能量耦合和烧结动力学的影响。我们的研究结果表明，在临界延迟阈值（约30 ps）内，双脉冲处理可以协同调节电子温度，抑制热离子发射，并加速颈部形成。此外，通过比较不同的能量注入方案，我们发现虽然高低能组合可以提高处理速度，但等能量比可以在电子温度控制和形态演化之间取得最佳的整体平衡。这些发现为定制双脉冲激光参数提供了理论指导，为先进的激光烧结应用提供了增强的过程可控性和改善的材料质量。

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引用次数: 0

Relationship between slurry dispersion and sheet structure in multi-component systems: a case study of cathodes for all-solid-state batteries 多组分系统中浆液分散与薄片结构的关系：以全固态电池阴极为例

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-11-19 DOI: 10.1016/j.apt.2025.105112

Kenta Kitamura , Miu Asakura , Gaku Tsutsui , Takamasa Mori

Uniform dispersion in multi-component slurries is crucial for powder-based sheet fabrication but remains challenging, particularly in high-concentration systems. Existing evaluation methods may fail to adequately capture complex dispersion behaviors, limiting the design of stable, high-performance materials. This study investigated the relationship among particle dispersion, rheological properties, and the structural and electrical characteristics of cathode sheets for all-solid-state batteries, using particle concentration as a controlled variable. Slurries containing LiNi_0.8Mn_0.1Co_0.1O₂, Li₆.₂₅La₃Zr₂Al_0.25O₁₂, and acetylene black were prepared at concentrations of 30 to 45 vol%. Between 30 and 40 vol%, improved dispersion decreased the slurry’s relative viscosity ratio and increased the sheet packing fraction, resulting in lower sheet volume resistivity. However, at 45 vol%, the slurry exhibited the highest relative viscosity ratio—ordinarily interpreted as strong aggregation—and the highest sheet packing fraction, due to rapid network formation following effective dispersion. However, the sheet volume resistivity increased markedly, likely owing to excessive solid electrolyte dispersion disrupting the conductive network. These findings provide new insights and demonstrate that complementary methods are essential for accurately evaluating dispersion states in multi-component slurries. This knowledge can enhance the performance of sheet-formed bodies and optimize process control in multi-component slurry systems, such as those used in all-solid-state batteries.

多组分浆料的均匀分散对于粉末基薄板制造至关重要，但仍然具有挑战性，特别是在高浓度系统中。现有的评估方法可能无法充分捕捉复杂的色散行为，从而限制了稳定、高性能材料的设计。本研究以颗粒浓度为控制变量，研究了全固态电池正极片的颗粒分散、流变性能、结构和电学特性之间的关系。制备了含LiNi0.8Mn0.1Co0.1O2、Li6.25La3Zr2Al0.25O12和乙炔黑的浆料，其体积浓度为30 ~ 45 vol%。在30 ~ 40 vol%之间，分散性的改善降低了浆液的相对粘度比，增加了板材的填充率，从而降低了板材的体积电阻率。然而，在45 vol%时，浆液表现出最高的相对粘度比（通常被解释为强聚集）和最高的片状堆积分数，这是由于有效分散后快速形成的网络。然而，薄片体积电阻率显著增加，可能是由于过多的固体电解质分散破坏了导电网络。这些发现提供了新的见解，并证明了互补方法对于准确评估多组分浆料中的分散状态是必不可少的。这些知识可以提高板状体的性能，并优化多组分浆液系统的过程控制，例如用于全固态电池的浆液系统。

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引用次数: 0

A multi-superquadric DEM method for high-fidelity modelling mixing and breakage of non-spherical particles in rotary drums 一种高保真模拟转鼓中非球形颗粒混合与破碎的多次超二次DEM方法

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-11-19 DOI: 10.1016/j.apt.2025.105076

Zhan Luo, Shuai Wang, Yansong Shen

Non-spherical particles are widely encountered in engineering applications, yet their irregular shapes pose challenges for accurate modelling in the discrete element method (DEM) framework. This study develops a novel multi-superquadric particle model that incorporates both combination and separation operations for sub-particles, enabling the simulation of non-spherical particle breakage under specific trigger conditions. For the first time, the coexistence of intact multi-superquadric particles and their sub-particles post-separation is implemented within a unified computational domain while maintaining continuous motion integration. The combination sub-model is validated against experimental data and applied to investigate the effects of rotational speed on particle mixing in a horizontal drum. Additionally, the breakage sub-model is applied to investigate the particle breakage behaviors, according to the experimentally determined force-based binary (yes/no) decision criterion. The results show that rotational speed significantly influences the velocity distribution of multi-superquadric particles. A twofold increase in rotational speed (from 25 rpm to 50 rpm) reduces the mixing time by approximately 50 % and increases the transient breakage rate by 1.75 times. This study provides a robust modelling framework for analyzing complex non-spherical particle systems, offering new insights into particle breakage mechanisms and their impact on granular flows in industrial processes.

非球形颗粒在工程应用中广泛存在，但其不规则形状对离散元法（DEM）框架中的精确建模提出了挑战。本研究开发了一种新的多超二次粒子模型，该模型结合了亚粒子的组合和分离操作，能够模拟特定触发条件下的非球形粒子破碎。首次在统一的计算域内实现了分离后完整的多超二次粒子及其亚粒子的共存，同时保持了连续的运动积分。结合实验数据对组合子模型进行了验证，并应用该组合子模型研究了转速对水平转鼓内颗粒混合的影响。此外，根据实验确定的基于力的二元（yes/no）判定准则，采用破碎子模型研究颗粒的破碎行为。结果表明，转速对多次超二次粒子的速度分布有显著影响。转速增加一倍（从每分钟25转到每分钟50转），混合时间减少约50%，瞬时破碎率增加1.75倍。这项研究为分析复杂的非球形颗粒系统提供了一个强大的建模框架，为颗粒破碎机制及其对工业过程中颗粒流动的影响提供了新的见解。

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引用次数: 0

A numerical simulation study on the effectiveness of a two-stage electrostatic precipitator in removing residential submicron-sized cooking particles 两级静电除尘器去除亚微米级烹饪颗粒的数值模拟研究

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-11-18 DOI: 10.1016/j.apt.2025.105117

Huizhe Cao , Ye Jiang , Yuanbo Wang , Haisheng Shi , Jiankai Dong

Reducing oil fume particle emissions during kitchen cooking is crucial for maintaining indoor air quality. This study focused on studying a two-stage ESP in residential kitchens to enhance its capture efficiency of submicron-sized particles. Through simulations, four factors were examined: plate spacing in the dust collection area, length of the dust collection area, dust collection voltage, and inlet wind speed. Based on the influencing factors, the structure optimization and optimization verification experiments of ESP were carried out. The results of the study revealed that by reducing the plate spacing from 6.67 mm to 5 mm, the capture efficiency of partial size particles can be increased by 42.18 %. Additionally, increasing the length of the dust collection area by 20 mm can result in a 13.8 % increase. Furthermore, increasing the dust collection voltage by 1.5 kV can result in a 30.07 % increase. Lastly, reducing the inlet wind speed by 0.7 m/s can lead to a 12.61 % increase in capture efficiency. The optimization results show that the trapezoidal plate improves particle capture efficiency across different particle sizes with changing wind speed. These findings highlight the need to optimize ESP parameters in kitchens to effectively capture submicron oil fumes and improve indoor air quality.

减少厨房烹饪过程中油烟颗粒的排放对保持室内空气质量至关重要。本研究主要研究了一种用于住宅厨房的两级ESP，以提高其对亚微米颗粒的捕获效率。通过模拟，考察了集尘区板间距、集尘区长度、集尘电压和进口风速四个因素。基于影响因素，对电除尘器进行了结构优化和优化验证实验。研究结果表明，将板间距从6.67 mm减小到5 mm，可使部分粒径颗粒的捕集效率提高42.18%。此外，将集尘区域的长度增加20mm可导致13.8%的增加。此外，提高1.5 kV的集尘电压可使其提高30.07%。最后，将进口风速降低0.7 m/s可使捕获效率提高12.61%。优化结果表明，随着风速的变化，梯形板可以提高不同粒径颗粒的捕集效率。这些发现强调了优化厨房ESP参数以有效捕获亚微米油烟和改善室内空气质量的必要性。

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引用次数: 0

Implementation of a Yukawa force model in polymer-induced bridging flocculation of hematite particles using CFD-DEM 利用CFD-DEM实现汤川力模型在赤铁矿颗粒聚合物诱导桥接絮凝中的应用

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-11-13 DOI: 10.1016/j.apt.2025.105096

Lequan Zeng , Jackquline C. Eardley , George V. Franks , Eirini Goudeli

Polymer-induced bridging flocculation of hematite particles under laminar shear flow is simulated using a coupled Computational Fluid Dynamics – Discrete Element Method (CFD-DEM). The attractive interactions between the polymer-coated particles are represented by a Yukawa force model, parameterised through benchmarking the CFD-DEM-derived cumulative chord length distributions (CLDs) against experimental measurements. By introducing a power-law dependency of the interaction constant on polymer dosage, the model accurately predicts the experimentally observed steady state mean aggregate chord length across a polymer dose range of 50–250 g/t. At steady state, the mass mean aggregate size,

\bar{D_{4, 3}}

, scales linearly with the average chord length,

\bar{CL}

, establishing a quantitative relationship between particle size and chord length. The flocculation kinetics are described using a modified shear-induced aggregation rate that incorporates an enhancement factor,

γ

, based on the effective volume fraction that includes both the particles and their polymer layers. The proposed flocculation rate captures the influence of the interaction range introduced by polymer extension and enables accurate prediction of polymer-induced flocculation in mineral suspensions.

采用计算流体力学-离散元耦合方法（CFD-DEM）模拟了层流剪切作用下聚合物诱导赤铁矿颗粒桥接絮凝过程。聚合物包覆颗粒之间的吸引相互作用由汤川力模型表示，该模型通过cfd - dem推导的累积弦长分布（CLDs）与实验测量值的基准进行参数化。通过引入相互作用常数与聚合物剂量的幂律关系，该模型准确地预测了在50-250 g/t的聚合物剂量范围内实验观察到的稳态平均聚合弦长。在稳态下，质量平均骨料粒径D4,3¯与平均弦长CL¯呈线性关系，建立了粒径与弦长之间的定量关系。絮凝动力学是用一种改进的剪切诱导聚合率来描述的，该聚合率包含一个增强因子γ，基于包括颗粒及其聚合物层的有效体积分数。所提出的絮凝速率捕获了聚合物延伸引入的相互作用范围的影响，从而能够准确预测聚合物诱导的矿物悬浮液中的絮凝。

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引用次数: 0

Parameter sensitivity in DEM of aggregates for road and construction materials 公路建筑材料集料DEM参数敏感性研究

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-11-13 DOI: 10.1016/j.apt.2025.105116

Dong Feng

The discrete element method (DEM) is widely used in civil engineering and road engineering to simulate the motion and interaction of aggregate particles in pavement structures. Due to the interaction between particles, selecting or calibrating particle property input parameters is one of the critical issues in DEM implementation. The angle of repose (AOR) testing is a standard test method used to calibrate the overall behavior of simulated aggregates. In this study, AOR testing of coarse aggregate particles with SMA-11 gradation is modeled to investigate the effect of different parameters on the simulation results and to calibrate parameters. For this purpose, sensitivity analyses are performed for different factors, i.e., model object, AOR testing method, rolling friction coefficient, Young’s modulus, and surface energy. The results show that the selected Young’s modulus can be reduced by up to four orders of magnitude compared to the real Young’s modulus without affecting the simulation results. The model object, rolling friction coefficient, and surface energy are significant factors for determining the AOR, and the AOR testing method does not affect the parameter sensitivity. The conclusion indicates that investigation of sensitivity parameters facilitates the implementation of DEM applications for aggregate particles in road engineering.

离散元法（DEM）广泛应用于土木工程和道路工程中，用于模拟路面结构中骨料颗粒的运动和相互作用。由于粒子之间的相互作用，粒子属性输入参数的选择或标定是DEM实现中的关键问题之一。休止角（AOR）测试是一种标准的测试方法，用于校准模拟集料的整体性能。本研究对SMA-11级配的粗集料颗粒进行AOR试验，研究不同参数对模拟结果的影响，并对参数进行标定。为此，对模型对象、AOR试验方法、滚动摩擦系数、杨氏模量、表面能等不同因素进行敏感性分析。结果表明，与实际杨氏模量相比，所选杨氏模量可降低4个数量级，而不影响仿真结果。模型对象、滚动摩擦系数和表面能是决定AOR的重要因素，AOR测试方法不影响参数的灵敏度。研究结果表明，敏感性参数的研究有助于在道路工程中实现集料颗粒的DEM应用。

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引用次数: 0

Study on the effect of porous materials with sand-dust adhesion on explosion characteristics of combustible gas in utility tunnels 含沙尘的多孔材料对公用事业隧道可燃气体爆炸特性的影响研究

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-11-11 DOI: 10.1016/j.apt.2025.105114

Zehao Yin, Lingjun Xu, Zengliang Zhang

This study systematically investigates the coupling effects of pore characteristics and sand-dust adhesion on methane-air explosion propagation. Experiments were conducted in a semi-confined pipeline using four types of silicon carbide foam ceramics (10–40 PPI) with controlled sand-dust loads (0–20 mL) at two strategic positions. High-speed imaging and pressure sensors recorded flame velocity and overpressure dynamics. Results demonstrate a critical pore-dependent suppression mechanism: while 10 PPI materials enhance flame acceleration due to insufficient quenching, 20 PPI permits limited propagation, and 30–40 PPI show progressively stronger suppression, with 40 PPI achieving optimal performance as its pore size approaches methane’s quenching diameter. Sand-dust adhesion creates competing effects—inducing turbulence while causing flow blockage—leading to a nonlinear response where explosion intensity peaks at 10 mL across all materials. This consistent pattern reveals a universal coupling mechanism between particulate resuspension and porous structures. The findings provide both fundamental insights into explosion dynamics and practical guidelines for designing advanced industrial explosion protection systems, particularly in dust-prone environments like utility tunnels and industrial ducts.

本文系统地研究了孔隙特性和沙尘附着对甲烷-空气爆炸传播的耦合效应。实验在半密闭管道中进行，使用四种碳化硅泡沫陶瓷（10-40 PPI），在两个战略位置控制沙尘负荷（0-20 mL）。高速成像和压力传感器记录了火焰速度和超压动态。结果显示了一种关键的孔隙依赖抑制机制：10种PPI材料由于淬火不足而增强了火焰加速，20种PPI允许有限的传播，30-40种PPI的抑制作用逐渐增强，其中40种PPI在孔径接近甲烷的淬火直径时达到最佳性能。沙尘粘附产生了相互竞争的效应——在引起气流阻塞的同时诱导湍流——导致非线性响应，所有材料的爆炸强度在10ml时达到峰值。这种一致的模式揭示了颗粒再悬浮和多孔结构之间的普遍耦合机制。这些发现为爆炸动力学和设计先进的工业防爆系统提供了基本的见解，特别是在粉尘易发的环境中，如公用事业隧道和工业管道。

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引用次数: 0

In depth exploration of the microbial dust suppression mechanism: from the perspective of CaCO3 characteristics 微生物抑尘机理的深入探讨：从CaCO3特性的角度

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-11-11 DOI: 10.1016/j.apt.2025.105101

Yue Feng , Mei-Xuan Ha , Xiang-Ming Hu , Pan-Pan Qiu , Yan-Yun Zhao , Li Chen , Yan-Lin Qu , Tong Li , Hui Rong , Xiao-Niu Yu

Microbial dust suppressants, an eco-friendly dust control method, have been widely studied for improving suppression efficiency. This study focused on CaCO₃ precipitation characteristics (production, crystal form, particle size, and morphology) and investigated the relationship with dust suppression performance and elucidated the underlying mechanism. Results found that changes in these characteristics affect the erosion resistance of the consolidated layer. And, high production, calcite form, small particle size, and rod-shaped morphology enhanced consolidation strength. Furthermore, production showed the strongest correlation with erosion resistance (p = 0.008, p < 0.001), followed by crystal form (p < 0.001, p = 0.01) and morphology (p = 0.016, p = 0.008), while particle size had the weakest correlation (p = 0.037, p = 0.025). Meanwhile, the discrete element method (DEM) was used to simulate the interaction between different types of CaCO₃ and coal. Research found that high-production, calcite type, small particle size, and rod-shaped CaCO₃ improved the consolidation effect by generating more contact bonds with coal powder particles, providing stronger mechanical properties, entering deeper pores, and connecting more coal powder particles. This work identified key CaCO₃ related factors influencing microbial dust suppression, offering clear guidance for optimizing microbial agents.

微生物抑尘剂作为一种环保型抑尘方法，为提高抑尘效果而得到了广泛的研究。本研究主要研究CaCO3的析出特性（产生、晶型、粒度和形貌），并探讨其与抑尘性能的关系，并阐明其机理。结果发现，这些特性的变化会影响固结层的抗侵蚀性能。高产量、方解石形态、小粒度和棒状形态增强了固结强度。产量与耐蚀性相关性最强（p = 0.008, p < 0.001），其次是晶型（p < 0.001, p = 0.01）和形貌（p = 0.016, p = 0.008），粒径相关性最弱（p = 0.037, p = 0.025）。同时，采用离散元法（DEM）模拟了不同类型CaCO3与煤的相互作用。研究发现，高产、方解石型、小粒径、棒状的CaCO3通过与煤粉颗粒产生更多的接触键，提供更强的力学性能，进入更深的孔隙，连接更多的煤粉颗粒，从而改善了固结效果。本研究确定了影响微生物抑尘的关键CaCO3相关因素，为微生物制剂的优化提供了明确的指导。

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引用次数: 0

Modulating the low-temperature NH3-SCR activity of bimetallic MOF-derived MnCeOx/C catalyst via the molar ratio of manganese and cerium 锰铈摩尔比对mof衍生MnCeOx/C催化剂低温NH3-SCR活性的调节

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-11-11 DOI: 10.1016/j.apt.2025.105102

Ruichao Yang , Zhifang Li , Jinxing Cui , Yuanyuan Ma , Changlong Yang

The elimination of nitrogen oxides has become a focal point in the field of the control of air pollution. A series of MnCeO_x/C catalysts are synthesized using in-situ pyrolysis under N₂ atmosphere using bimetallic Mn/Ce-MOF as the precursor. The effects of different Mn/Ce molar ratios on the structure, physicochemical properties and NH₃-SCR performance are investigated. The results show that the Mn3Ce1O_x/C catalyst displays excellent low-temperature activity (NO_x conversion is more than 90 %) at 175–275 ℃. This is attributed to the large specific surface area of the Mn3Ce1O_x/C, while the addition of Ce promotes the formation of oxygen vacancies through the Mn³⁺+Ce⁴⁺↔ Ce³⁺ + Mn⁴⁺ redox cycle, which further facilitates the oxidation of NO to NO₂, resulting in the formation of a “fast SCR” reaction. Meanwhile, the Mn3Ce1O_x/C catalyst has prominent tolerance to H₂O and SO₂, which is attributed to the sacrificial site Ce to protect the active component Mn as well as the hydrophobicity of the MOF-derived carbon material. This work provides a novel approach for designing high-performance low-temperature SCR catalysts.

氮氧化物的消除已成为大气污染治理领域的一个热点。以双金属Mn/Ce-MOF为前驱体，在N2气氛下原位热解合成了一系列MnCeOx/C催化剂。研究了不同Mn/Ce摩尔比对结构、理化性质和NH3-SCR性能的影响。结果表明，mn3ce10ox /C催化剂在175 ~ 275℃具有良好的低温活性（NOx转化率大于90%）。这是由于Mn3Ce1Ox/C具有较大的比表面积，而Ce的加入通过Mn3++Ce4+↔Ce3+ + Mn4+氧化还原循环促进了氧空位的形成，这进一步促进了NO氧化为NO2，从而形成了“快速SCR”反应。同时，mn3ce10ox /C催化剂对H2O和SO2具有突出的耐受性，这是由于mof衍生碳材料的疏水性以及为保护活性成分Mn而牺牲的位点Ce。本研究为设计高性能低温SCR催化剂提供了一条新的途径。

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引用次数: 0