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Promotion effect of Ce and Ta co-doping on the NH_(3)-SCR performance over V_(2)O_(5)/TiO_(2)catalyst

Journal of Environmental Sciences 2025年第4期150卷 332-339页

作者： Long Liu Xin Shen Zhihua Lian Chunxi Lin Ying Zhu Wenpo Shan Hong He Collaborative Innovation Center of Chemistry for Energy Materials College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China

NH_(3)-SCR(SCR:Selective catalytic reduction)is an effective technology for the de-NO_(x)process from both mobile and stationary pollution sources,and the most commonly used catalysts are the vanadia-based *** innovative V_(2)O_(5)-CeO_(2)/TaTiO_(x)catalyst for NO_(x)removal was prepared in this *** influences of Ce and Ta in the V_(2)O_(5)-CeO_(2)/TaTiO_(x)catalyst on the SCR performance and physicochemical properties were *** V_(2)O_(5)-CeO_(2)/TaTiO_(x)catalyst not only exhibited excellent SCR activity in a wide temperature window,but also presented strong resistance to H_(2)Oand SO_(2)at 275◦C.A series of characterizationmethods was used to study the catalysts,including H2-temperature programmed reduction,X-ray photoelectron spectroscopy,NH_(3)-temperature programmed desorption,*** was discovered that a synergistic effect existed between Ce and Ta *** introduction of Ce and Ta enlarged the specific surface area,increased the amount of acid sites and the ratio of Ce^(3+),(V^(3+)+V^(4+))and Oα,and strengthened the redox capability which were related to synergistic effect between Ce and Ta species,significantly improving the NH_(3)-SCR activity.

关键词： NH_(3)-SCR Vanadia-based catalysts Synergistic effect Co-doping Low temperature

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Nonpolar cross-stacked super-aligned carbon nanotube membrane for efficient wastewater treatment

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Frontiers of Environmental Science & Engineering 2023年第3期17卷 37-47页

作者： Shuang Zhang Shuai Liang Yifan Gao Yang Wu Xia Huang Bejing Key Laboratory for Source Control Technology of Water Pollution College of Environmental Science and EngineeringBeijing Forestry UniversityBeijing 100083China Engineering Research Center for Water Pollution Source Control&Eco-remediation College of Environmental Science and EngineeringBeijing Forestry UniversityBeijing 100083China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China Department of Physics and Tsinghua-Foxconn Nanotechnology Research Center Tsinghua UniversityBeijing 100084China

Membrane separation technology has made great progress in various practical applications,but the unsatisfactory separation performance of prevailing membrane materials hampers its further sustainable *** study proposed a novel nonpolar super-aligned carbon nanotube(SACNT)membrane,which was prepared with a layer-by-layer cross-stacking *** controlling the number of stacked SACNT layers,three kinds of SACNT membranes(SACNT_200,SACNT 300,and SACNT_400)were *** characterizations and filtration tests were performed to investigate their physico-chemical properties,surface wetting behavior,and filtration *** with two commercial membranes(Com_0.22 and Com_0.45),all the SACNT membranes achieved smoother and more uniform *** to the hexagonal graphene structure of CNTs,the surface chemistry of the SACNT membranes is simple and inert,thereby potentially eliminating the covalent-bonding-induced membrane ***,the SACNT membranes exhibited a typical nonpolar wetting behavior,with high contact angles for polar liquids(water:~124.9°-126.5°;formamide:~80.0°-83.99)but low contact angles for nonpolar diodomethane(~18.8°-20.99).This unique nonpolar feature potentially leads to weak interactions with polar ***,compared with the commercial membranes,the SACNT membranes obtained a significantly higher selectivity while achieving a comparable or higher permeability(depending on the number of stacked layers).Moreover,the SACNT membranes exhibited superior separation performance in various application scenarios,including municipal wastewater treatment(2.3 times higher cleaning efficiency),electro-assistant fouling inhibition(or even self-cleaning),and oil/water separation(>99.2%of separation efficiency),suggesting promising application prospects in various fields.

关键词： Membranefouling Wastewater Membrane separation Antifouling Aligned carbon nanotube

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Trends and drivers of anthropogenic NOx emissions in China since 2020

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Environmental Science and Ecotechnology 2024年第5期21卷 287-293页

作者： Hui Li Bo Zheng Yu Lei Didier Hauglustaine Cuihong Chen Xin Lin Yi Zhang Qiang Zhang Kebin He Shenzhen Key Laboratory of Ecological Remediation and Carbon Sequestration Institute of Environment and EcologyTsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing 100084China State Environmental Protection Key Laboratory of Environmental Planning and Policy Simulation and Center of Air Quality Simulation and System Analysis Chinese Academy of Environmental PlanningBeijing 100041China Laboratoire des Sciences du Climat et de l’Environnement LSCE/IPSLCEA-CNRS-UVSQUniversite Paris-SaclayGif-sur-YvetteFrance Center for Satellite Application on Ecology and Environment Ministry of Ecology and Environment of ChinaBeijing 100094China Institute of Future Human Habitats Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China Ministry of Education Key Laboratory for Earth System Modeling Department of Earth System ScienceTsinghua UniversityBeijing 100084China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China

Nitrogen oxides(NOx),significant contributors to air pollution and climate change,form aerosols and ozone in the ***,timely,and transparent information on NOx emissions is essential for decision-making to mitigate both haze and ozone ***,a comprehensive understanding of the trends and drivers behind anthropogenic NOx emissions from Chinadthe world's largest emitterdhas been lacking since 2020 due to delays in emissions *** we show a consistent decline in China's NOx emissions from 2020 to 2022,despite increased fossil fuel consumption,utilizing satellite observations as constraints for NOx emission estimates through atmospheric *** reduction is corroborated by data from two independent spaceborne instruments:the TROPOspheric Monitoring Instrument(TROPOMI)and the Ozone Monitoring Instrument(OMI).Notably,a reduction in transport emissions,largely due to the COVID-19 lockdowns,slightly decreased China's NOx emissions in *** subsequent years,2021 and 2022,reductions in NOx emissions were driven by the industry and transport sectors,influenced by stringent air pollution *** satellite-based inversion system developed in this study represents a significant advancement in the real-time monitoring of regional air pollution emissions from space.

关键词： China's NOx emissions Pollution control Socio-economic drivers Atmospheric inversion

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Effects of Br−on NDMA Formation During Chloramination:a Review of Influencing Factors,Mechanisms,and control

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Chemical Research in Chinese Universities 2023年第3期39卷 370-377页

作者： XIA Ruanjunjie LIAO Xiaobin LIU Tianze GAO Menglan CHEN Chao Institute of Municipal and Environmental Engineering College of Civil EngineeringHuaqiao UniversityXiamen361021P.R.China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing100084P.R.China

For the invasion of seawater and the stress of human activities,bromide ion(Br−)exists widely in drinking water sources,and it was found to influence the formation of non-brominated but carcinogenic nitrogen-containing disinfection by-product nitroso-dimethylamine(NDMA)during chloramination(NH2Cl).The presence of Br−leads to the formation of bromine-active species,such as bromamines(NH2Br),bromochloramine(NHClBr),as well as hypobromous acid(HOBr),which are more reactive with NDMA precursors than chlorine-active species,so might promote NDMA *** review mainly focuses on the influencing laws,as well as the factors(disinfection conditions and characteristics of water matrixes)that affected NMDA formation during chloramination with Br−.In addition,the possible influencing pathways are ***,based on the above summary,measures pertaining to reduce the impact of Br−on NDMA production are *** review would provide a theoretical reference for drinking water treatment plants to deal with bromine-containing water during chloramination.

关键词： Bromide ion Disinfection by-product Nitrosodimethylamine(NDMA) Chloramination

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simulation Analysis of EFDC of Oil-Paper Insulation under Typical Electrode Structures with the Influence of Harmonic Voltage 9

Simulation Analysis of EFDC of Oil-Paper Insulation under Ty...

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9th Asia Conference on Power and Electrical Engineering, ACPEE 2024

作者： Zhang, Ning Hao, Jian Xu, Jing Wang, Jixiang Chen, Houhe Liao, Ruijin Northeast Electric Power University Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Jilin China Chongqing University State Key Laboratory of Power Transmission Equipment Technology School of Electrical Engineering Chongqing China

ISBN: (纸本)9798350309638

The primary sources of harmonic distortion in the new power system are a high percentage of access to power electronic equipment and a high percentage of renewable energy grid connections. These factors pose a major risk to the UHV converter transformer oil-paper insulation performance. However, the influence law of harmonic voltage on the electric field distribution characteristics (EFDC) of oil-paper insulation is still unclear;thus, the law of variation of spatial maximum electric field strength (SMEFS) under the action of harmonic voltage and the EFDC on the surface of oil-immersed insulating paper are investigated in this paper by building a two-dimensional simulation model of the electric field distribution of oil-paper insulation under ball-plate and cylinder-plate electrode structure. The results indicate that the two electrode structures' SMEFS are situated in the narrow oil gap between the oil-impregnated insulating paper and the high-voltage electrode;under the influence of the same harmonic components, the insulating paper's surface exhibits an inverse power function decay in the electric field distribution, with the cylinder-plate electrode decaying more quickly than the ball-plate electrode. Meanwhile, for both electrode structures, with the increase of the 5th and 13th harmonics, the SMEFS and the insulating paper surface field strength both increase linearly and are higher than that of the power frequency field strength, while for the 7th and 11th harmonics, the ball-plate electrode weakens the electric field and then increases it with the increase of the harmonic content, whereas the cylinder-plate electrode only increases the electric field. © 2024 IEEE.

关键词： Electric fields

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High-Porosity, Layered Iridium Oxide as an Efficient, Durable Anode Catalyst for Water Splitting

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CCS Chemistry 2025年第1期7卷 216-228页

作者： Zhoubing Xie Xiao Liang Zhenye Kang Yongcun Zou Xiyang Wang Yimin A.Wu Graham King Qi Liu Yalan Huang Xiao Zhao Hui Chen Xiaoxin Zou State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012 State Key Laboratory of Marine Resource Utilization in South China Sea Hainan Provincial Key Lab of Fine ChemistrySchool of Chemical Engineering and TechnologyHainan UniversityHaikou 570228 Department of Mechanical and Mechatronics Engineering Waterloo Institute for NanotechnologyUniversity of WaterlooWaterlooOntario N2L 3G1 Canadian Light Source Saskatoon SK S7N 2V3 Department of Physics City University of Hong KongHong Kong 999077 School of Materials Science and Engineering Key Laboratory of Automobile Materials of MOEState Key Laboratory of Automotive Simulation and ControlElectron Microscopy CenterJilin UniversityChangchun 130012

Lowering iridium(Ir)loading without sacrificing activity and durability is critical to the future development of proton exchange membrane water electrolyzer(PEMWE).Here,we present the synthesis of iridate-derived,layered iridium oxide microparticles(dubbed p-L-IrO_(2))with a high open porosity of approximately 74%and their structural advantages for the fabrication of efficient,durable,low-Ir-loading anode catalytic layer in *** p-L-IrO_(2) material is synthesized by an easily scalable route involving acid treatment of alkali metal salt-templated iridates that form in mixed alkali metal nitrateshydroxides at low *** combination of high-porosity morphology and layered structure in the material preferentially exposes a high density of hydroxylated edge sites,which are catalytically active and stable to achieve the oxygen evolution reaction via a structurally hydroxyl group-participated adsorbate evolution *** material is further demonstrated to enable the fabrication of low-Ir-loading anode catalytic layers in PEMWE,which can afford excellent catalytic performance(2.7 A cm^(−2)@1.9 V@80℃;membrane:Nafion^(TM)N115)due to the simultaneous reduction of activation and mass transport losses and retention of catalytic activity for 2300 h at 1.0 A cm^(−2) current density.

关键词： electrocatalysis water splitting iridium porous materials PEM electrolyzer

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Optimization Design of Airless Tire Based on Re-entrant Hexagonal Cellular Structure with Negative Poisson's Ratio Characteristics

Optimization Design of Airless Tire Based on Re-entrant Hexa...

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2022中国汽车工程学会年会暨展览会

作者： Zhao Ying Wang Binlin Yin Jusan Zhou Keming Hu Boyuan Liu Xuanming Ma Fangwu College of Engineering and Technology Southwest University State Key Laboratory of Automotive Simulation and Control Jilin University

ISBN: (纸本)9789819913640

To resolve the issues of poor load-carrying performance,high-speed instability and complex structure for airless tires,the re-entrant hexagonal airless tire with negative Poisson's ratio is *** start with,thickness coefficient a,length coefficient β,angle between side unit beam and unit axis,and re-entrant angle of the two sides are regarded as design variables,the calculation model of relative density is ***,response surface models of specific energy absorption and peak collision force of unit cell are established by constructing finite element *** this basis,optimal structural parameters can be achieved by adopting genetic algorithm with the objectives of maximum specific energy absorption,minimum peak collision force,and minimum relative density,and with the constraints that length coefficient and thickness coefficient are less than 1 and unit cell is possessed with the characteristic of negative Poisson's ***,the effects of various support structural parameters on mechanical properties of airless tires are analyzed and compared with conventional hexagonal honeycomb tire of the same *** results indicate that the energy absorption and 1 modal vibration frequency of proposed airless tire increase by 10.76% and 27.84%,***,peak stress and mass decrease by 38.69% and 13.52%,respectively.

关键词： airless tire multi-objective optimization performance analysis re-entrant hexagonal cellular structure with negative Poisson’s ratio

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Thermal Field simulation and Thermal Capacity Influence Factor Analysis of Disc Brake Based on Thermal-structure Coupling 3

Thermal Field Simulation and Thermal Capacity Influence Fact...

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2023 3rd International Conference on Fluid and Chemical Engineering, ICFCE 2023

作者： Chang, Jinyun Jiang, Daxin Han, Chao Wu, Xiaoyi Hu, Feng Research and Development Institute China First Automobile Group Co. Ltd Changchun130000 China State Key Laboratory of Comprehensive Technology for Automobile Vibration Noise and Safety Control Changchun130000 China

The matching and heat dissipation capacity of the brake have an important impact on the braking performance of the vehicle. During braking, most of the driving kinetic energy of the vehicle is converted into the internal energy of the brake disc through friction heat generation, resulting in a quick rise in the temperature of the brake disc, thus causing a complex thermal-solid coupling problem. This paper takes the disc brake of a certain vehicle as the analysis object, establishes the finite element model of the disc brake through hypermesh, and analyzes the distribution characteristics of the contact pressure between the friction pad and the brake disc under clamping and torsion braking behaviors. A thermal-solid coupling simulation analysis method considering the actual heat flow and heat transfer boundary of the brake disc is proposed. Compared with the temperature field of the bench test, the simulation accuracy reaches 97%. Finally, three types of brake discs with point rib, rotation rib and straight rib are designed, and the influence of brake disc thickness, shape and number of ventilation rib on the thermal capacity of brake disc is analysed. It provides guidance for the structural design of brake discs and can replace partial tests and shorten the brake disc development cycle. © Published under licence by IOP Publishing Ltd.

关键词： Kinetics

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Research on Dynamic Obstacle Avoidance and Path Planning Methods in Emergency Scenarios 7

Research on Dynamic Obstacle Avoidance and Path Planning Met...

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7th CAA International Conference on Vehicular control and Intelligence, CVCI 2023

作者： Lv, Ying Qi, Xu Dong, Xiaoyu Wang, Xinyu Chen, Guoying Yao, Jun National Key Laboratory of Advanced Vehicle Integration and Control China FAW Co.Ltd Changchun China College of Automotive Engineering Jilin University Changchun China State Key Laboratory of Automotive Simulation and Control Jilin University Changchun China

ISBN: (纸本)9798350340488

With the rapid development of autonomous driving, much attention has been paid to the development of collision avoidance systems in emergency scenarios that have a critical impact on driving safety. In this paper, a multi-constraint collision avoidance path planning method that considers the drivable area of a vehicle is proposed to meet the safety and real-time requirements of collision avoidance for autonomous vehicles. The algorithm defines the collision hazard moment, calculates the relationship between the collision hazard moment and the vehicle position constraint, makes corrections to the drivable area in the vehicle collision avoidance process, and finally obtains the vehicle emergency collision avoidance path by solving an optimization problem that satisfies the vehicle dynamics constraints and the position constraints. In this paper, the Matlab/Carsim/Prescan simulation sets up a high-speed driving condition in front of which there is an obstacle in the same direction of motion to prove that the multi-constraint optimized path planning algorithm considering the vehicle's travelable area can obtain a smooth and collision-free path, and the steering wheel changes smoothly in the tracking control, and the tracking control accuracy is below 0.07m. The experimental results show that the planning algorithm achieves the accurate lane change process The experimental results show that the planning algorithm achieves precise constraints on the lane change process, meets the requirements of the collision avoidance process on the computational efficiency, and takes into account the comfort of the driver. © 2023 IEEE.

关键词： automated driving numerical optimization path planning

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simulation of Arc Erosion on the Main Contact of On-Load Tap Changer 4th

Simulation of Arc Erosion on the Main Contact of On-Load Tap...

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4th International Symposium on Insulation and Discharge Computation for Power Equipment, IDCOMPU 2023

作者： Zhou, Yuanxiang Dai, Yasong Chen, Jianning Li, Yuhang Hou, Xuzhao Zhang, Zhen State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing100084 China The Wind Solar Storage Division of State Key Laboratory of Power System and Generation Equipment School of Electrical Engineering Xinjiang University Urumqi830047 China

ISBN: (纸本)9789819974047

Long-term operation and switching of transformer on-load tap-changers can cause degradation and deterioration of the main contact material, even leading to contact arcing damage in severe cases. However, the arcing mechanism of the main contact during the switching has not been clarified yet. A magneto-hydrodynamic simulation method of main contact arcing has been proposed. The geometry of the main contact in transformer oil is simplified, and the simulation model of the arc temperature field of the main contact in transformer oil coupled with electric, magnetic, thermal and fluid fields is proposed. The dynamic evolution of the arc temperature has been investigated at peak currents of 2100 A, 1500 A, 600 A and 300 A, respectively. The results show that with the increase of the spacing between contacts, the temperature at arc core rises rapidly and then decreases slowly, and the temperature can reach 50177 K at 2100A. Due to the electron bombardment at the anode surface, the temperature at anode surface is higher than that at cathode surface under different chopped currents. The highest temperatures at anode and cathode surface can reach 4142.5 K and 4081.7 K respectively. © Beijing Paike Culture Commu. Co., Ltd 2024.

关键词： Deterioration

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