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Heat transfer mechanism of magnesia-alumina solid heat storage materials through matrix composition regulation

Ceramics International 2025年第14期51卷 18896-18905页

作者： Hao, Bianlei Sun, Guangchao Zhang, Lunliang Liu, Kaiqi State Key Laboratory of Mesoscience and Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China University of Chinese Academy of Sciences Beijing100049 China

In this research, by regulating the proportion of magnesia and bauxite (71.2 wt% Al2O3) fine powder (≤74 μm) in material matrix, which easily affects the phase composition, a green body was prepared by casting molding. Subsequently, the green body was heat treated by simulating the heat storage heating process (1000 °C), thus obtaining magnesia-alumina materials. By regulating the matrix composition, the issue of balancing thermomechanical performance and heat transfer performance was resolved. The increase in the proportion of bauxite resulted in an augmentation of phase types and defects, which enhanced phonon intrinsic scattering, defect scattering, and interface scattering, becoming the primary reason for the reduction in thermal conductivity. Ultimately, samples with a thermal conductivity of 3.58 W m−1 K−1, compressive strength of 39.8 MPa, and a refractoriness under load temperature of 1506 °C were obtained, achieving a balance between high thermal conductivity and thermomechanical performance. This provides a technical solution for enhancing the performance and enabling large-scale, low-cost production of high-temperature heat storage materials. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Low temperature production

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Boosting electrochemical reduction of CO_(2)to CO using molecule-regulated Ag nanoparticle in ionic liquids

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Green Energy & Environment 2025年第4期10卷 813-820页

作者： Fangfang Li Kuilin Peng Chongyang Jiang Shaojuan Zeng Xiangping Zhang Xiaoyan Ji Energy Engineering Division of Energy ScienceLuleåUniversity of TechnologyLuleå97187Sweden Beijing Key Laboratory of Ionic Liquids Clean Process State Key Laboratory of Multiphase Complex SystemsInstitute of Process EngineeringChinese Academy of SciencesBeijing100190China College of Chemical Engineering and Environment China University of PetroleumBeijing102249China

Electrochemical reduction of CO_(2)is a promising approach to convert CO_(2)to high-valued chemicals and ***,developing efficient electrocatalysts featuring desirable activity and selectivity is still a big *** this work,a strategy of introducing functionalized molecules with desirable CO_(2)affinity to regulate Ag catalyst for promoting electrochemical reduction of CO_(2)was ***,3-mercapto-1,2,4-triazole was introduced onto the Ag nanoparticle(Ag-m-Triz)for the first time to achieve selectively converting CO_(2)to carbon monoxide(CO).This Ag-m-Triz exhibits excellent performance for CO_(2)reduction with a high CO Faradaic efficiency(FECO)of 99.2%and CO partial current density of 85.0 mA cm^(-2)at-2.3 V ***/Agt in H-cell when combined with the ionic liquid-based electrolyte,30 wt%1-butyl-3-methylimidazolium hexafluorophosphate([Bmim][PF6])-65 wt%acetonitrile(AcN)-5 wt%H2O,which is 2.5-fold higher than the current density in Ag-powder under the same *** studies confirm that the significantly improved performance of Ag-m-Triz originates from(i)the stronger adsorption ability of CO_(2)molecule and(ii)the weaker binding energy to form the COOH*intermediate on the surface of Ag-m-Triz compared with the Ag-powder catalyst,which boosts the conversion of CO_(2)to *** research provides a facile way to regulate electrocatalysts for efficient CO_(2)reduction by introducing functionalized molecules.

关键词： CO_(2)reduction CO Electrochemical Molecule-regulated Silver Ionic liquid

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LBM-DEM Simulation of Particle-Laden Flow Around Porous Microspheres: Effect of Particle Retention

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Transport in Porous Media 2025年第6期152卷 1-28页

作者： Chen, Zhao Fu, Shaotong Wang, Limin State Key Laboratory of Mesoscience and Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China School of Chemical Engineering University of Chinese Academy of Sciences Beijing100049 China

Porous spheres are extensively employed as carriers for the adsorption or transport of functional substances, making the exploration of particle retention within them a subject of considerable importance. The intricate dynamics of particle-laden flow around three-dimensional (3D) porous microspheres are elucidated through the coupling model of lattice Boltzmann method (LBM) and discrete element method (DEM). This investigation examines how the ratios of particle-to-pore sizes and the gradation of pore sizes influence particle retention. The numerical findings indicate that, in the absence of particle agglomeration, smaller particles tend to increase the trapped solid holdup within porous media. However, once a specific particle size threshold is surpassed, the retention process becomes selective and highly specific, with the retention efficiency closely tied to the correlation between the sizes of the pore throats and the particles. The optimal retention scenario is realized when there is a precise alignment between the particle size and the dominant size distribution of the pore throats. This provides crucial insights into the structural design of porous media, with the objective of enhancing particle retention efficiency. © The Author(s), under exclusive licence to Springer Nature B.V. 2025.

关键词： Microporous materials

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Tandem asymmetric propargylic amination/carboxylative cyclization reaction to chiral 5-methylidene-2-oxazolidinones using CO_(2) as C1 synthon

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Science China Chemistry 2025年第4期68卷 1402-1411页

作者： Zheng Zhang Zhi-Hao Zhang Ying Sun Yun-Hao Tang Yi-Zhuo Yang Feng Zhou Jian Zhou State Key Laboratory of Petroleum Molecular&Process Engineering Shanghai Key Laboratory of Green Chemistry and Chemical ProcessesShanghai Engineering Research Center of Molecular Therapeutics and New Drug DevelopmentSchool of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai 200062China State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032China

We report a tandem asymmetric Cu-catalyzed propargylic amination(ACPA)/Ag-catalyzed carboxylative cyclization(SCC)with CO_(2) to 5-methylidene-2-oxazolidinones;even with tetrasubstituted *** varying pyridine bisoxazoline(PYBOX)ligands;a general and highly enantioselective ACPA of unprecedentedly broad scope of secondary propargylic acetates and primary amines is ***α-aryl andα-aliphatic propargylic acetates could react with either aromatic or aliphatic primary amines to give the corresponding N-aryl or N-aliphatic ethynylamines withα-aliphatic orα-aryl groups in over 90%ee for use in the next *** key to developing this one-pot sequence is to use a chelator triethylenetetramine(TETA)to mask the copper ion;to avoid its negative effect on Ag-catalyzed cyclization;whilst releasing PYBOX to activate the silver *** the methylidene moiety;these oxazolidinones can be readily *** value of the sequence is further shown by the catalytic enantioselective total synthesis of(–)-cytoxazone and the potent ezetimibe analogue.

关键词： CO_(2) 2-oxazolidinone tandem sequence propargylic amination carboxylative cyclization

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Single-Electrode Electrostatic Repulsion Phenomenon for Remote Actuation and Manipulation

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Research 2025年第1期2024卷 333-345页

作者： Wei Tang Dong Yan Kecheng Qin Xinyu Guo Yiding Zhong Huxiu Xu Huayong Yang Jun Zou State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhouChina School of Mechanical Engineering Zhejiang UniversityHangzhouChina Institute of Process Equipment College of Energy EngineeringZhejiang UniversityHangzhouChina

One of the fundamental principles of electrostatics is that an uncharged object will be attracted to a charged object through electrostatic induction as the two approaches one *** refer to the charged object as a single electrode and examine the scenario where a positive voltage is *** of electrostatic induction phenomenon,single-electrode electrostatics only generates electrostatic attraction ***,we discover that single-electrode electrostatics can generate electrostatic repulsion forces and define this new phenomenon as single-electrode electrostatic repulsion *** investigate the fundamental electrostatic phenomena,giving a curve of electrostatic force versus voltage and then defining 3 *** actuation and manipulation are essential technologies that are of enormous concern,with tweezers playing an important *** tweezers designed on the basis of external fields of optics,acoustics,and magnetism can be used for remote actuation and manipulation,but some inherent drawbacks still *** would benefit greatly from our discovery in *** the basis of this discovery,we propose the concept of electrostatic tweezers,which can achieve noncontact and remote actuation and *** characterizations and successful applications in metamaterials,robots,and manipulating objects demonstrated that electrostatic tweezers can produce large deformation rates(>6,000%),fast actuation(>100 Hz),and remote manipulating distance(~15 cm)and have the advantages of simple device structure,easy control,lightweight,no dielectric breakdown,and low *** work may deepen people's understanding of single-electrode electrostatics and opens new opportunities for remote actuation and manipulation.

关键词： electrostatic induction remote actuation single electrode single electrode electrostatics charged object electrostatic repulsion

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Strategically designing and fabricating nitrogen and sulfur Co-doped g-C3N4 for accelerating photocatalytic H2 evolution

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材料科学技术（英文版） 2025年第5期208卷 111-119页

作者： Haitao Wang Lianglang Yu Jiahe Peng Jing Zou Jizhou Jiang School of Chemistry and Environmental Engineering School of Environmental Ecology and Biological EngineeringKey Laboratory of Green Chemical Engineering Process of Ministry of EducationEngineering Research Center of Phosphorus Resources Development and Utilization of Ministry of EducationNovel Catalytic Materials of Hubei Engineering Research CenterWuhan Institute of TechnologyWuhan 430205China State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China

Doping engineering is an effective strategy for graphitic carbon nitride(g-C3N4)to improve its photocat-alytic hydrogen evolution reaction(HER)*** this work,a novel nitrogen and sulfur co-doped g-C3N4(N,S-g-C3N4)is elaborately designed on the basis of theoretical predictions of first-principle density functional theory(DFT).The calculated Gibbs free energy of adsorbed hydrogen(ΔGH·)for N,S-g-C3N4 at the N-doping active sites is extremely close to zero(0.01 eV).Inspired by the theoretical predictions,the N,S-g-C3N4 is successfully fabricated through ammonia-rich pyrolysis synthesis strategy,in which ammonia is in-situ obtained by pyrolyzing *** characterizations indicate that the N,S-g-C3N4 possesses high specific surface area,outstanding light utilization,good hydrophilicity,and efficient carrier transfer ***,the N,S-g-C3N4 displays an extremely high H2 evolution rate of 8269.9 μmol g-1 h-1,achieves an apparent quantum efficiency(AQE)of 3.24％,and also possesses outsatnding *** calculations further demonstrate that N and S dopants can not only introduce doping energy level to reduce the band gap,but also induce charge redistribution to facilitate hydrogen adsorption,thus promoting the photocatalytic HER ***,femtosecond transient absorption(fs-TA)spectroscopy further corroborates the efficient photogenerated carrier transport of N,*** research highlights a promising and reliable strategy to achieve superior photocatalytic activity,and exhibits significant guidance for precise designing high-efficiency photocatalysts.

关键词： Theoretical predictions g-C3N4 N and S co-doping Photocatalytic H2 evolution

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Volatolomics in Fritillarias and Their Identification by Orientation Controlled cMOF Thin Film Chemiresistors

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Chinese Journal of Chemistry 2025年第4期43卷 371-377页

作者： Lin-An Cao Yi-Qian Li Yun-Fei Huo Lu Sun Xiao-Qin Li Lu Chen Xue-Tong Yang Fang-Li Yuan Ming-Shui Yao Ningxia Key Laboratory of Green Catalytic Materials and Technology College of Chemistry and Chemical EngineeringNingxia Normal UniversityGuyuanNingxia 756000China state Key Laboratory of Mesoscience and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China

As one of the famous traditional Chinese herbal medicines,Fritillariae Cirrhosae Bulbus(FCB)is widely used in the prevention and treatment of respiratory diseases and has the best curative effect among the known fritillarias *** to the variety,complex sources,similar appearance and shape,it is difficult to distinguish FCB with high curative effect(h-FCB)from other common fritillarias(c-FCB)in the *** this paper,a very simple chemiresistor is used to identify FCB from three commonly used fritillarias *** sensors are fabricated by anisotropic electrically conductive metal-organic framework(cMOF)thin film Cu_(3)(HHTP)_(2)(Cu-HHTP_([001])and Cu-HHTP_([100]))as active materials owing to their ability to detect specific groups of volatile organic compounds(volatolomics)as the functional motifs of *** a result,the sensors show orientation-dependence identification ability to ***-HHTP_([001])-based sensor shows the highest response(344.17%)to 0.5 g h-FCB powder volatiles among its three other c-FCB which is much higher than Cu-HHTP_([100])(135.50%).Ultimately,Cu-HHTP_([001])can realize the identification of FCB with an accuracy of 97.2% in a simple and real-time manner.

关键词： Volatolomics Anisotropic cMOF thin film Chemiresistor Traditional Chinese herbal medicines identification Matteridentification

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Thermal decomposition mechanism and particle size regulation in calcination of barium titanyl oxalate tetrahydrate for fabricating barium titanate nanoparticles

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Particuology 2025年第3期98卷 94-104页

作者： Yunfei Yan Haixia Zhang Junrong Yue Yu Guan Lei Shao State Key Laboratory of Mesoscience and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing100190China Research Center of the Ministry of Education for High Gravity Engineering and Technology College of Chemical EngineeringBeijing University of Chemical TechnologyBeijing100029China School of Chemical Engineering University of Chinese Academy of SciencesBeijing100049China

Barium titanate(BaTiO_(3))is an important ferroelectric and electronic ceramic material because of its outstanding dielectric and ferroelectric *** demand for BaTiO_(3) nanoparticles with adjustable particle size has increased extensively due to the miniaturization of electronic *** oxalate precipitation method is regarded as a highly attractive technology for fabricating BaTiO_(3) nanoparticles,as it enables large-scale production at a low ***,the calcination process is a crucial step that significantly influences the particle size and morphology of the obtained BaTiO_(3) *** study investigates the thermal decomposition mechanism and particle size regulation strategies during the calcination of barium titanyl oxalate tetrahydrate(BTOT)for fabricating BaTiO_(3) *** Kissinger-Akahira-Sunose(KAS)model is used to calculate the kinetic parameters of BTOT thermal decomposition process,and the results indicate that the decomposition process can be divided as four stages,with the average activation energy of 60.77,269.89,484.72,and 199.82 kJ/mol,*** average activation energy reaches its maximum value in the third stage,indicating that the thermal decomposition reaction in this stage is more challenging to occur compared to the other *** gas release behaviors of H_(2)O,CO,and CO_(2) are analyzed on-line during the thermal decomposition of BTOT,and the overall reaction mechanism is ***,by adjusting the calcination parameters,the particle size of BaTiO_(3) could be effectively regulated within the range of 25-120 *** the heating rate from 10 to 40 K/min decreases the average particle size of BaTiO_(3) from 62 to 44 *** the calcination time from 0 to 120 min increases the average particle size from 25 to 71 *** the terminal temperature from 1173 to 1273 K significantly increases the average particle size from 56 to 120 ***,accelerating the heating rat

关键词： BaTiO_(3) Barium titanyl oxalate tetrahydrate Thermal decomposition Activation energy

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Ammonia-induced CuO/13X for H_(2)S removal from simulated blast furnace gas at low temperature

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Green Energy & Environment 2025年第1期10卷 139-149页

作者： Erping Cao Yuhua Zheng Hao Zhang Jianshan Wang Yuran Li Tingyu Zhu Zhan-guo Zhang Guangwen Xu Yanbin Cui State Key Laboratory of Mesoscience and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing100190China State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization PanGang Group Research Institute Co.Ltd.Panzhihua Sichuan617000China Shenyang University of Chemical Technology Shenyang110142China University of Chinese Academy of Sciences Beijing 100049China

Blast furnace gas(BFG)is an important by-product energy for the iron and steel industry and has been widely used for heating or electricity ***,the undesirable contaminants in BFG(especially H_(2)S)generate harmful environmental *** desulfurization of BFG is urgent for integrated steel plants due to the stringent ultra-low emission *** with other desulfurization materials,zeolite-based adsorbents represent a viable option with low costs and long service *** this study,an ammonia-induced CuO modified 13X adsorbent(NH_(3)–CuO/13X)was prepared for H_(2)S removal from simulated BFG at low *** XRD,H_(2)-TPR and TEM analysis proved that smaller CuO particles were formed and the dispersion of Cu on the surface of 13X zeolite was improved via the induction of *** on H_(2)S adsorption performance of the adsorbent was carried out using simulated BFG,and the results showed that NH_(3)–CuO/13X-3 has better breakthrough sulfur capacity,which was more than twice the sulfur capacity of CuO/*** is proposed that the enhanced desulfurization performance of NH_(3)–CuO/13X is attributed to an abundant pore of 13X,and combined action of 13X and *** work provided an effective way to improve the sulfur capacity of zeolite-based adsorbents via impregnation method by ammonia induction.

关键词： Blast furnace gas Desulfurization Ammonia-induced CuO 13X zeolite

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Decentralized Federated Learning Algorithm Under Adversary Eavesdropping

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IEEE/CAA Journal of Automatica Sinica 2025年第2期12卷 448-456页

作者： Lei Xu Danya Xu Xinlei Yi Chao Deng Tianyou Chai Tao Yang the State Key Laboratory of Synthetical Automation for Process Industries Northeastern University the Department of Mechanical Engineering University of Victoria Shanghai Institute of Intelligent Science and Technology Tongji University IEEE the Institute of Advanced Technology Nanjing University of Posts and Telecommunications

In this paper, we study the decentralized federated learning problem, which involves the collaborative training of a global model among multiple devices while ensuring data *** classical federated learning, the communication channel between the devices poses a potential risk of compromising private information. To reduce the risk of adversary eavesdropping in the communication channel, we propose TRADE(transmit difference weight) concept. This concept replaces the decentralized federated learning algorithm's transmitted weight parameters with differential weight parameters, enhancing the privacy data against eavesdropping. Subsequently, by integrating the TRADE concept with the primal-dual stochastic gradient descent(SGD)algorithm, we propose a decentralized TRADE primal-dual SGD algorithm. We demonstrate that our proposed algorithm's convergence properties are the same as those of the primal-dual SGD algorithm while providing enhanced privacy protection. We validate the algorithm's performance on fault diagnosis task using the Case Western Reserve University dataset, and image classification tasks using the CIFAR-10 and CIFAR-100 datasets,revealing model accuracy comparable to centralized federated learning. Additionally, the experiments confirm the algorithm's privacy protection capability.

关键词： Adversary eavesdropping decentralized federated learning privacy protection stochastic gradient descent

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