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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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Study on Insulation Characteristics of Moisture in the Buffer Layer of 66 kV AC XLPE Cables 19th

Study on Insulation Characteristics of Moisture in the Buffe...

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19th Annual Conference of China Electrotechnical Society, ACCES 2024

作者： Cao, Kangyangyong Xing, Hongquan Huang, Dawei Wei, Zhenhao Liu, Shili State Grid Changchun Power Supply Company Jilin China Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin China

ISBN: (纸本)9789819613861

To address the frequent failure issues caused by defects in the buffer layer of high-voltage cross-linked polyethylene (XLPE) cables, research on buffer layer has become a hot topic at present. This paper first introduces the input impedance model of the 66 kV cable buffer layer and the corrugated aluminum sheath. The water content can change its resistance and capacitance, thereby affecting the resistivity and dielectric constant. Secondly, the paper introduces the intrinsic principles of frequency domain dielectric spectroscopy technology, where changes in water content alter the relaxation time of the Debye model, thereby changing the dielectric loss factor. Then, by conducting resistance and capacitance measurement experiments on a 6 cm long cable buffer layer, the paper derives the resistivity and dielectric constant variation curves. Through dielectric loss factor measurement experiments, it derives the dielectric loss factor curve, demonstrating the correlation between water content and the dielectric loss factor. The paper concludes that the dielectric loss factor curve is more sensitive to insulation conditions at low frequencies. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Dielectric losses

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Publisher Erratum: Design of energy-saving driving strategy based on proximal policy optimization considering urban transport information(control Theory and Technology, (2025), 23, (74–90), 10.1007/s11768-024-00233-7)

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control Theory and Technology 2025年

作者： Liu, Qifang Sun, Dazhen Chen, Haowen Li, Dongzi Wang, Ping Department of Control Science and Engineering Jilin University Jilin Changchun130022 China State Key Laboratory of Automotive Simulation and Control Jilin University Jilin Changchun130022 China

In this article, the received, revised and accepted dates are missing. Please find the correct history dates here: Received: 15 October 2023. Revised: 20 March 2024. Accepted: 6 May 2024. © The Author(s), under exclusive licence to South China University of Technology and Academy of Mathematics and Systems Science, Chinese Academy of Sciences 2025.

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Study on the Effects of Moisture on Dielectric Loss and Capacitance Parameters of 66 kV AC XLPE Cable Insulation 19th

Study on the Effects of Moisture on Dielectric Loss and Capa...

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19th Annual Conference of China Electrotechnical Society, ACCES 2024

作者： Cao, Kangyangyong Xing, Hongquan Huang, Dawei Zong, Guanbo Liu, Shili State Grid Changchun Power Supply Company Jilin China Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin China

ISBN: (纸本)9789819613861

Long-term operation or external forces may cause damage to the outer sheath of the cable, allowing moisture to enter the cable body and affecting the insulation and dielectric performance of the main XLPE insulation of the cable. For 66 kV cables, there are no clear values provided for the changes in the dielectric loss tangent and capacitance after water ingress into the main insulation. Using a self-built experimental platform, dielectric spectroscopy curves were plotted for the main insulation under 1 kV voltage, showing the variation of the dielectric loss tangent with water content and frequency. The unit capacitance changes of the main insulation due to moisture were also measured. The study indicates that at 0.01 Hz, when the water content in the main insulation increases from 0.86% to 1.29%, the dielectric loss tangent value changes by several times. Additionally, this value is not affected by the location of the moisture—whether it is accumulated, evenly distributed, or symmetrically distributed, the dielectric loss tangent remains unchanged. When the volumetric water content increases by 0.48%, the unit capacitance value increases by 0.8%. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Dielectric losses

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Unique electronic regulation in bimetallic MOF for efficient electrochemical synthesis of H2O2 at 500 mA cm−2

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Nano Energy 2025年 141卷

作者： Yu, Yang Jiao, Dongxu Yi, Lingya Zhao, Dantong Zou, Jiajia Cui, Xiaoqiang Hu, Weihua School of Materials and Energy Chongqing Key Laboratory of Battery Materials and Technology Southwest University Chongqing400715 China State Key Laboratory of Automotive Simulation and Control School of Materials Science and Engineering Key Laboratory of Automobile Materials of MOE Jilin University Changchun130012 China

Metal-organic frameworks (MOFs) have attracted significant attention in the field of electrocatalytic synthesis of H2O2 through 2-electron oxygen reduction reaction (ORR). However, the active sites responsible for catalysis have remained unknown, and practical application of MOFs in this area is yet to be demonstrated. In this study, a CoZn bimetallic MOF catalyst (BIM-Co2Zn8-500, BIM refers to benzimidazole) based on imidazole was synthesized and exhibited exceptional activity, selectivity and stability for the electrocatalytic synthesis of H2O2. The catalyst achieved a high H2O2 yield of 21.77 mol g−1 h−1 and a Faradaic Efficiency (FE) of 92.5 % at a current density of 500 mA cm−2 using a gas diffusion electrode, thus showing great potential for practical applications. Through joint spectroscopic characterizations and density function theory (DFT) calculations, a unique electronic regulation mechanism was elucidated in this catalyst. It was found that the catalytic sites were the coordinately unsaturated Zn atoms, whose electronic structure was regulated by the nearby Co/Zn nodes. This regulation enabled precise adjustment of the binding free energy of the *OOH intermediate, thereby enhancing the 2-electron ORR activity. © 2025

关键词： Electrolytic reduction

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Enhanced Ru–Ce interface electron transfer and reverse oxygen spillover promote chlorobenzene catalytic oxidation

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Applied Catalysis B: Environmental 2025年 373卷

作者： Chen, Deli Si, Wenzhe Wang, Rong Yuan, Xing Zhou, Bin Chen, Zhen Peng, Yue Li, Junhua State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

The catalytic oxidation of chlorinated volatile organic compounds (CVOCs) is still a big challenge due to chlorine poisoning and the polychlorinated byproducts. Ru-loaded CeO2 catalysts have attracted much attention in CVOCs oxidation. To optimize the surface electronic structure of Ru/CeO2, we reduced the CeO2 support to enhance the metal-support interaction of the Ru/CeO2 catalyst, resulting in higher Ru dispersion and stronger interface electron transfer. The Reduction treatment not only enhances the activation of O2 molecules by promoting the generation of interface electron-rich units but also stimulates stronger reverse oxygen spillover (ROS). The improved oxygen activation and migration ability accelerates the decomposition of intermediate products. Besides, the lower surface electrostatic potential also weakens the chlorine adsorption of the catalyst. After the modification, the oxidation rate of chlorobenzene increased by more than 1.5 times at 240–320 °C and the T90 decreased by about 50 °C. © 2025

关键词： Catalytic oxidation

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Forest Mercury Deposition Observation in Chongqing: Evaluating Effectiveness of Mercury Pollution control over the Past Decade in Southwestern China

ACS ES&T Air

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ACS ES&T Air 2025年第2期2卷 286-294页

作者： Ziyi Zhan Dongwei Lv Huang Zhou Qingru Wu Yuying Cui Lei Duan State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University 100084 Beijing China School of the Environment Nanjing University 210023 Nanjing China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University 100084 Beijing China；State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Tsinghua University 100084 Beijing China

As the largest Hg reservoir in terrestrial ecosystems, forests provide valuable insights into atmospheric Hg levels through observations of mercury deposition. In this study, we conducted a one-year observation of Hg deposition, by both throughfall and litterfall, in a forest located in Chongqing, an industrial hub in southwestern China, in 2021. We compared the results with observations made at the same sampling site in 2010–2011. The results showed that there were significant decreases in both Hg concentrations (from 115 μg·kg–1to 80.2 μg·kg–1for litterfall and from 68.4 ng·L–1to 4.01 ± 2.09 ng·L–1for throughfall) and Hg deposition fluxes (from 89.8 μg·m–2·yr–1to 19.9 μg·m–2·yr–1for total deposition, decreasing by 77.8%) in the forest from 2010 to 2021. The decrease in deposition might result from the synergistic effect of reduction in both anthropogenic (inventory-listed or nonquantitative) and re-emission sources. Over the decade since the initiation of theMinamata Convention on Mercury, atmospheric Hg levels have decreased significantly, mainly due to the co-benefits of conventional air pollutant control, indicating the effectiveness of China’s Hg pollution control policies.

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Significant changes in the physicochemical properties of BC-containing particles during the cold season in Beijing

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Journal of Environmental Sciences 2025年第5期151卷 667-676页

作者： Shuya Hu Linghan Zeng Gang Zhao Shiyi Chen Chunsheng Zhao Weilun Zhao Min Hu State Key Joint Laboratory of Environmental Simulation and Pollution Control International Joint Research Center for Atmospheric Research(IJRC)College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China Department of Atmospheric and Oceanic Sciences School of PhysicsPeking UniversityBeijing 100871China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Nanjing University of Information Science and TechnologyNanjing 210044China

The ambient air quality has improved significantly under strict emission controls in Beijing,China over the last *** carbon(BC),as a short-lived climate forcer in ambient aerosols,profoundly impacts the air quality and *** studies have demonstrated a decline in the mass concentration of *** this study,we characterized the chemical compositions and size distributions of BC-containing particles during the cold season of 2022 in Beijing using state-of-the-art instruments capable of exclusively measuring BCcontaining *** optical properties of BC-containing particles were further calculated based on the Mie ***,we compared the properties of BC-containing particles in 2022 with the results of previous *** results showed that the diameters of BC cores became larger while the coating thickness of BC-containing particles became thinner in *** the coating materials,the mass fraction of nitrate increased obviously,and even replaced organic matter as the dominant component during the peak of the pollution *** in chemical compositions and size distributions resulted in lower mass absorption cross-sections(MAC)of BC-containing particles from 10.5±1.1 m^(2)/g in 2016 to 7.3±0.8 m^(2)/g in 2022,reduced by 30.5%.Our results demonstrate the synergistic benefits of air pollution control in improving air quality and mitigating climate ***,the MAC of BC adopted in climate models should vary with the changing air pollution *** study emphasizes that it is imperative to conduct long-term observations of BC-containing particles to better estimate BC’s climate effects.

关键词： Black carbon Chemical composition Size distribution Light absorption ability

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Transient Synchronization Stability Analysis of Grid-Following Converter Power Systems Using Local Network Measurements 9th

Transient Synchronization Stability Analysis of Grid-Followi...

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9th Purple Mountain Form on Smart Grid Protection and control, PMF 2024

作者： Wei, Xiaoqiang Liu, Naiyuan He, Zhifeng Yang, Hao Sun, Zhenglong State Grid Heilongjiang Electric Power Company Limited Harbin150000 China Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin132000 China

ISBN: (纸本)9789819616701

There is an urgent need to address the transient synchronization stability (TSS) problem caused by the increasing penetration of renewable resources into the power network through grid-following converters (GFL-VSCs). It is challenging to analyze the TSS in power systems with high penetration of renewable resources due to the complex interaction between a large number of GFL-VSCs and power network. Although some research has been carried out on TSS assessment of GFL-VSC systems, its application is limited because measuring the numerous internal parameters of distributed converters is hard. To fill this gap, this paper proposes a TSS analysis method using local network measurements. The present study first constructs a port energy function for PLL-controlled converters, establishing the relationship between the internal control and the transient energy of the converter. Secondly, the branch energy function is constructed using the law of energy conservation. Due to transient energy interactions between the converters and the branches, the transient instability characteristics of the converters are mapped into the network. Transient instability characteristics are extracted through PMUs in the network. On this basis, the TSS of the GFL-VSC systems is analyzed through the identified critical branches. Finally, the effectiveness of the proposed method is validated through simulations on the modified IEEE 39-BUS system and a practical power system. © state Grid Electric Power 2025.

关键词： Transient stability

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Intelligent vehicle decision-making strategy integrating spatiotemporal features at roundabout

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Expert Systems with Applications 2025年 273卷

作者： Ma, Wenxiao Wu, Jian Sun, Bohua Leng, Xinlun Miao, Weiwei Gao, Zhenhai Li, Wenjin State Key Laboratory of Automotive Simulation and Control Jilin University Chang chun130022 China R&D Center Chassis Department China FAW Group Corporation Chang chun130022 China

To overcome the problems of weak driving safety and low traffic efficiency of intelligent vehicles in roundabout scenarios, and to improve the autonomous decision-making ability of intelligent systems. In this paper, we propose an intelligent vehicle Decision-Making Strategy based on SpatioTemporal graph neural Networks, namely DMS-STNet. Using end-to-end deep learning methods based on the historical information of intelligent vehicles and surrounding vehicles, output the action sequence of future driving behavior of intelligent vehicles. Specifically, a spatiotemporal graph is used to model the driving environment of vehicles, and a graph convolutional neural network is used to explore the spatial interaction relationship between intelligent vehicles and environmental vehicles. Next, based on the time convolutional network, learn the temporal characteristics of intelligent vehicles. Further integrate the complex spatiotemporal interaction relationship between intelligent vehicles and environmental vehicles through a gated fusion network. Moreover, a multi-layer perceptron is used to map the fused tensor into a sequence of driving behavior actions. In addition, experimental data collection and software in the loop testing verification were conducted on the Carla simulator platform. The research results indicate that the model proposed in this paper outperforms the comparative models in terms of prediction accuracy, safety, and traffic efficiency, fully leveraging the autonomous decision-making performance advantages of intelligent vehicles. © 2025 Elsevier Ltd

关键词： Convolutional neural networks

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