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Migration and transformation behavior of lattice nitrogen during chemical looping ammonia synthesis of tungsten-based nitrogen carrier

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International Journal of Hydrogen Energy 2025年 147卷

作者： Ziheng Han Tuo Guo Jingjing Ma Xiude Hu Qingjie Guo Zhongbin Liu State Key Laboratory of High efficiency Utiliztion of Coal and Green Chemical Engineering College of Chemistry and Chemical Engineering Ningxia University Yinchuan 750021 China Xinyuan Green Carbon Technology (Jiangmen) Co. Ltd Jiangmen 529199 China Laboratory of Green & Smart Chemical Engineering in Universities of Shandong College of Chemical Engineering Qingdao University of Science and Technology Qingdao Shandong 266042 China Sichuan Provincial Key Lab of Process Equipment and Control Sichuan University of Science & Engineering Zigong 643000 China

The mild reaction conditions in chemical looping ammonia synthesis (CLAS) offer the potential for green ammonia technology. This study developed W 2 N nitrogen carrier(NC), characterized by a high lattice nitrogen conversion rate and an increased ammonia yield. The results demonstrate that reaction temperature is a key factor in regulating the lattice nitrogen conversion rate of the NC. At 600 °C, the conversion of lattice nitrogen is incomplete. However, as the reaction temperature increases from 600 °C to 850 °C, a notable transition occurs in the crystal phase of the NC, changing from W 2 N (at 600 °C) → W 2 N and W (at 750 °C) → W (at 850 °C). The lattice nitrogen conversion rate increases significantly from 12.5 % to 73.3 %. At 800 °C, the ammonia yield reached 594 μmol g −1 h −1 . This work lays a foundation for the design of efficient transition metal NC.

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Al 0.5 CoCrFeNi-yNb high-entropy alloys via spark plasma sintering: Microstructural evolution, property enhancement, and wear resistance optimization

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Intermetallics 2025年 185卷

作者： Ke Xiong Jinran Li Ke Zhang Qinghua Zhou Lin Huang Xia Li Xiaowu Luo Zhongwei Ni Yanmin Liu Hao Zhu Qiang Zhang Wei Feng School of Architecture and Environment Sichuan University Chengdu 610065 China School of Aeronautics and Astronautics Key Laboratory of Advanced Spatial Mechanism and Intelligent Spacecraft (Ministry of Education) Robotic Satellite Key Laboratory of Sichuan Province Sichuan University Chengdu 610065 China School of Mechanical Engineering Chengdu University Chengdu 610106 China CRCC High-Tech Equipment Corporation Limited. Kunming Yunnan 654300 China Beijing Institute of Control Engineering Beijing 100094 China Department of Mechanics and Engineering Science Sichuan University Chengdu 610065 China

This study explores the effects of Nb doping (0–9 wt%) on Al 0.5 CoCrFeNi HEAs via mechanical alloying-spark plasma sintering (MA-SPS). Nb addition drives the formation of a hexagonal Laves phase (Co(Ni, Fe, Cr) 2 Nb), with its volume fraction increasing from 0.042 % (1Nb) to 20.748 % (9Nb) and the face-centered cubic (FCC) phase decreasing from 84.8 % to 66.1 %. Thermodynamic stability of the Laves phase is confirmed via the average d-orbital energy level criterion ( ——Md > 0.9866) and CALPHAD simulations. Mechanical properties are significantly enhanced: Vickers hardness increases linearly from 275.4 to 453.3 HV 3 , and yield strength from 520.6 to 1092.6 MPa, attributed to synergistic strengthening from Nb-induced lattice distortion, Laves phase precipitation, and grain refinement. Plasticity decreases from 28 % to 5.6 % due to the brittle Laves phase. Tribological tests reveal that the 9Nb alloy exhibits a 71 % lower wear rate (8.61 × 10 −5 vs. 2.96 × 10 −4 mm 3 /(N·m)) owing to its high hardness, wear-resistant Laves phase, and dense Nb-stabilized oxide films (NbO/Nb 2 O 5 ), while maintaining high indentation fracture toughness (70.8 MPa√m) and compactness (>99 %). The MA-SPS process enables a controlled transition from a dual-phase (FCC + BCC) to a triphasic (FCC + BCC + Laves) microstructure, achieving an optimal balance of strength, toughness, and wear resistance. This work provides a quantitative framework for designing high-performance HEAs with tailored properties for demanding wear-resistant engineering applications.

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Tuning SnO_2 surface with CuO for soot particulate combustion: The effect of monolayer dispersion capacity on reaction performance

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Chinese Journal of Catalysis 2019年第6期40卷 905-916页

作者： Jiating Shen Xiaohui Feng Rui Liu Xianglan Xu Cheng Rao Jianjun Liu Xiuzhong Fang Chao Tan Youchang Xie Xiang Wang Key Laboratory of Jiangxi Province for Environment and Energy Catalysis College of ChemistryNanchang UniversityNanchang 330031JiangxiChina Jiangxi Baoan New Material Technology Corporation LTDPingxiang 337000JiangxiChina Key Laboratory of Process Analysis and Control of Sichuan Universities Yibin UniversityYibin 644000SichuanChina College of Chemistry and Molecular Engineering Peking UniversityBeijing 100871China

With the objective to investigate the structure-reactivity relationship of CuO/SnO2 and eventually design more applicable catalysts for soot combustion,catalysts with different CuO loadings have been prepared by impregnation *** using X-ray diffraction and X-ray photoelectron spectroscopy extrapolation methods,it is disclosed that CuO disperses finely on the SnO2 support to form a monolayer with a capacity of 2.09 mmol 100 m^-2,which equals 4.8 wt%CuO *** the CuO loading is below the capacity,it is in a sub-monolayer ***,when the loading is above the capacity,CuO micro-crystallites will be formed that coexist with the CuO *** soot combustion activity of the catalyst increases with the CuO loading until it reaches the monolayer dispersion capacity.A further increase in the CuO loading has no evident influence on the *** results have testified that with the addition of CuO onto the SnO2 support,a surface-active oxygen species can be formed,the amount of which also increases significantly with the increase in the CuO loading until it reaches the monolayer dispersion *** the CuO loading further has no evident impact on the amount of surface ***,an apparent monolayer dispersion threshold effect is observed for soot combustion over CuO/SnO2 *** is concluded that the amount of surface-active oxygen sites is the major factor determining the activity of the catalyst.

关键词： CuO supported on SnO2 Soot particulate combustion Monolayer dispersion X-ray diffraction and X-ray photoelectron spectroscopy extrapolation Threshold effect

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Investigation of anisotropic thermophysical properties of highly oriented carbon fiber composites: From one to three dimensions

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Carbon 2025年 243卷

作者： Yanhui Zhang Jie Yang Xiaoyu Zhang Rui Xu Minsu Liu Aoran Fan Yingjun Liu Jianli Wang Xing Zhang Jiangsu Key Laboratory for Design and Manufacturing of Precision Medicine Equipment Department of Mechanical Engineering Southeast University Nanjing 210096 China Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Engineering Mechanics Tsinghua University Beijing 100084 China Monash Suzhou Research Institute Monash University Suzhou 215000 China ARC Research Hub for Smart Process Design and Control School of Chemical and Biological Engineering Monash University Clayton VIC 3800 Australia MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province Zhejiang University 38 Zheda Road Hangzhou 310027 China

Highly oriented carbon fiber composites exhibit three-dimensional anisotropic thermophysical properties, making them candidates for thermal management applications. In this study, the thermal properties of highly oriented carbon fiber/epoxy resin (CF/ER) composites and their components were systematically investigated. The T-type probe method was employed to measure the pitch CF, while the 2ω method and the laser-spot-periodic-heating method were combined to characterize the E51-ER film and the composites. The impact of local fiber bending on heat transfer in the composites was also analyzed through finite element simulations. The results show that these composites exhibit high thermal conductivity along the fiber orientation with an anisotropy ratio of about 294. At different temperatures, the thermal conductivity along the fiber orientation is lower than the value predicted by the parallel model, while the conductivity in the other two directions is significantly higher than that predicted by the series model. Simulation results suggest that the bending of certain pitch CF can be a key factor contributing to this discrepancy.

关键词： Electron temperature

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Research on Current Situation and Countermeasures of sichuan New Energy Automobile Industry Development

Research on Current Situation and Countermeasures of Sichuan...

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2018 3rd International Conference on control, Automation and Artificial Intelligence (CAAI 2018)

作者： Tao Yang Yinghua Liao Dehui Zhao Sichuan University of Science & Engineering Sichuan Provincial Key Laboratory of Process Equipment and Control Engineering

Based on the situation of the development of new energy automobile industry in sichuan province, this article analyzes the problems in the development, demonstration and popularization of new energy vehicle industry. Combining sichuan's "13 th Five-Year Plan" strategic emerging industries planning, it puts forward three Countermeasures and Suggestions to speed up the development of new energy automobile industry in sichuan province. First, break through the core technologies under the guidance of government and cooperation between schools and enterprises. Second, promote the competitiveness of backbone enterprises in sichuan province and innovate the popularization modes of the market. The last suggestion is to improve the structure of the industry and complete the construction of components supporting system to realize the healthy and sustainable development of the whole automobile industry in sichuan province.

关键词： new energy automobile industry status supporting system

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Preparation and Physical Properties of Polyethylene/Carbon Nanotubes/Nanosilver Composite

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IOP Conference Series: Materials Science and engineering 2020年第1期774卷

作者： Feifan Ge Wei-Hua Yao Xu Lin Jui-Chin-Chen Lin Jiang Chi-Hui Tsou Material Corrosion and Protection Key Laboratory of Sichuan Province Sichuan Provincial Key Laboratory of Process Equipment and Control College of Materials Science and Engineering Sichuan University of Science and Engineering Zigong 643000 China Department of Materials and Textiles Oriental Institute of Technology New Taipei City 22061 Taiwan ROC Zigong Fourth People's Hospital Zigong 643000 China Sichuan zhirenfa Environmental Protection Technology Co. Ltd 64300 China Sichuan Zhixiangyi Technology Co. Ltd. Chengdu 610051 China

In this paper, nanosilver and carbon nanotubes was melt blended with HDPE and pet respectively to prepare HDPE/CNT/nanosilver and PET/CNT/nanosilver composites with antibacterial effect. After the preparation of samples, SEM, DSC, TGA, mechanical properties and antibacterial properties were tested. The possibility of preparing new materials by this method is studied. Compared with pure HDPE, when the content of CNT/nanosilver is 0.1 phr, the tensile strength of HDPE/CNT/nanosilver composite reach to the max value.

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Why synthesizing poly(1,4-phenylene sulfide) through oxidative polymerization has not so far been adopted as the industrial process

Why synthesizing poly(1,4-phenylene sulfide) through oxidati...

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Spring International Conference on Material Sciences and Technology, MST-S 2017

作者： Liu, Yefeng Li, Yanfen Yan, Xiaolan Yan, Jie Li, Minjiao Cui, Yishun School of Chemical Engineering Sichuan University of Science & Engineering ZigongSichuan643000 China Sichuan Provincial Key Lab of Process Equipment and Control Sichuan University of Science & Engineering ZigongSichuan643000 China Material Corrosion and Protection Key Laboratory of Sichuan province Sichuan University of Science & Engineering ZigongSichuan643000 China

ISBN: (纸本)9783035710939

Synthesis of poly (1, 4-phenylene sulfide) (PPS) through oxidative polymerization seems promising to us. Comparing with current commercial method to poly (1, 4-phenylene sulfide) from 1, 4-phenylene sulfide and sodium sulfide (Phillips’ Method), there are many advantages of the oxidative polymerization method. For example, it can synthesize PPS at normal temperature and pressure;the yield of reaction is very high;it provides pure PPS without salt contamination. However, several years have passed away;synthesis of poly (1, 4-phenylene sulfide) through oxidative polymerization has not so far been adopted as the industrial process. Many of us are puzzled, why? Through studying all kinds of reported preparation route to poly (1, 4-phenylene sulfide) through oxidative polymerization compared to Phillips’ Method, a generic polymerization mechanism is achieved for most of them excepting two with obvious shortcomings. We suddenly realize that synthesis of poly (1, 4-phenylene sulfide) through oxidative polymerization seems unsuitable to be used in industrial production recently because of its own limits. © 2017 Trans Tech Publications, Switzerland.

关键词： Sulfur compounds

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A rational approximation method of fractional order differentiators and integrators based on joint optimal criterion

International Journal of Control and Automation

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International Journal of control and Automation 2016年第6期9卷 251-264页

作者： Zhao, Huimin Guo, Chen Deng, Wu Li, Dongyan Yang, Xinhua Zou, Li Information Science and Technology College Dalian Maritime University Dalian116026 China Software Institute Dalian Jiaotong University Dalian116028 China Sichuan Provincial Key Lab of Process Equipment and Control Sichuan University of Science and Engineering Zigong64300 China Artificial Intelligence Key Laboratory of Sichuan Province Sichuan University of Science and Engineering Zigong64300 China

In this paper, a new rational approximation method for fractional-order differentiator aαand integrator sα(0<α<1) is presented. The method is based on the joint optimal rational approximation definition in the given frequency range and the error. First, a definition of joint optimal rational approximation is proposed and the constructing steps of the fractional-order integrator are discussed. Then the approximation algorithm of fractional-order integrator based on the joint optimal rational approximation definition is given. The construction steps of fractional-order integrator are explained by an illustrative example. Finally, the performance comparison result among the proposed approximation model, the Oustaloup's method and the best rational approximation method shows that the amplitude-frequency characteristic and phase-frequency characteristic of the joint optimal rational approximation method are better than the Oustaloup's method and the best rational approximation method. And the proposed model has higher approximation precision. © 2016 SERSC.

关键词： Rational functions

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The 5th International Conference on Biomedical engineering and Biotechnology (ICBEB 2016) Abstracts

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BMC MEDICAL IMAGING 2016年第SUPPL 1期16卷 65-65页

作者： [Anonymous] Department of MRI Shandong Medical Imaging Research Institute Affiliated to Shandong University Jinan Shandong 250021 People’s Republic of China Department of Interventional Radiology Shandong Provincial Hospital Affiliated to Shandong University Jinan Shandong 250021 People’s Republic of China College of Information Science and Technology Engr. Research Center of Digitized Textile & Fashion Tech. for Ministry of Education Donghua University Shanghai 201620 China Intelligent multimedia information processing Lab College of Software Northeastern University Shenyang Liaoning Province 110004 China Institute of Biomedical and Health Engineering Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 China School of Computer Science and Technology Nanjing Normal University Nanjing China Department of Electrical Engineering The City College of New York CUNY New York USA Jiangsu Key Laboratory of 3D Printing Equipment and Manufacturing Nanjing China School of Electronic Science and Engineering Nanjing University Nanjing Jiangsu 210046 China College of Engineering Nanyang Technological University Singapore 639798 Singapore School of Electronic Information Shanghai Dianji University Shanghai China School of Natural Sciences and Mathematics Shepherd University Shepherdstown WV 25443 USA Davis College of Agriculture Natural Resources and Design West Virginia University Morgantown WV 26505 USA State Key Laboratory of Millimeter Waves Southeast University Nanjing 210096 China Center of Medical Physics and Technology Hefei Institutes of Physical Science Chinese Academy of Sciences Hefei China College of Agricultural and Life Sciences University of Florida Gainesville FL 32611 USA Courant Institute of Mathematical Sciences New York University New York NY 10012 USA Translational Imaging Division & MRI Unit Columbia University and New York State Psychiatric Institute New York NY 10032 USA Guangxi Key Laboratory of Manufacturing System & Adv

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Optimization of tool-path generation for material extrusion-based additive manufacturing technology

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Additive Manufacturing 2014年 1卷 32-47页

作者： Jin, Yu-an He, Yong Fu, Jian-zhong Gan, Wen-feng Lin, Zhi-wei The State Key Lab of Fluid Power Transmission and Control Systems Department of Mechanical Engineering Zhejiang University Hangzhou310027 China Zhejiang Province's Key Laboratory of 3D Printing Process and Equipment Department of Mechanical Engineering Zhejiang University Hangzhou310027 China

In this study, we propose a tool-path generation approach for material extrusion-based additive manufacturing (AM) that considers the machining efficiency and fabrication precision, which are inherent drawbacks of general AM techniques compared with conventional manufacturing methods. The proposed approach aims to tackle the generation of direction-parallel tool-paths for the interior filling of simple connected areas, which comprises three main steps: (1) determining the inclination of reference lines;(2) generating and grouping tool-path segments into individual sub-paths;and (3) linking sub-paths based on specific requirements. These three modules interact to affect the efficiency and precision of AM significantly. In order to find an optimal inclination, we first analyze the impacts on the fabrication efficiency and manufacturing accuracy with different inclinations. A comparatively accurate building time model is developed subsequently to obtain the optimal tool-path inclination, but without compromising the machining precision, based on the analysis of a geometrical accuracy model. The proposed approach employs different inclinations in distinct layers according to specific manufacturing scenarios and technological requirements. After determining the reference lines, the tool-path segments are selected and grouped based on some characteristics (e.g., the number of intersections between reference lines and boundaries) to make up individual sub-paths, which are then connected to a zigzag-shaped path with short line segment connections. In the module for sub-path linking, some strategies are introduced to decrease the number of useless tool-paths, i.e., uncut paths, which could jeopardize the manufacturing quality by frequently turning the print head on and off. In addition, parametric curves are used to link the final sub-paths to avoid deceleration/acceleration processes in the end/starting parts of the sub-paths. The proposed approach has been used in practice

关键词： 3D printers

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