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Selective catalytic reduction of NOx with NH3:opportunities and challenges of Cu-based small-pore zeolites

National Science Review 2021年第10期8卷 139-158页

作者： Yulong Shan Jinpeng Du Yan Zhang Wenpo Shan Xiaoyan Shi Yunbo Yu Runduo Zhang Xiangju Meng Feng-Shou Xiao Hong He State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences College of Resources and Environment University of Chinese Academy of Sciences Center for Excellence in Regional Atmospheric Environment Institute of Urban Environment Chinese Academy of Sciences State Key Laboratory of Chemical Resource Engineering Beijing Key Laboratory of Energy Environmental Catalysis Beijing University of Chemical Technology Key Laboratory of Applied Chemistry of Zhejiang Province Department of Chemistry Zhejiang University

Zeolites, as efficient and stable catalysts, are widely used in the environmental catalysis field. Typically,Cu-SSZ-13 with small-pore structure shows excellent catalytic activity for selective catalytic reduction of NOxwith ammonia（NH3-SCR） as well as high hydrothermal stability. This review summarizes major advances in Cu-SSZ-13 applied to the NH3-SCR reaction, including the state of copper species, standard and fast SCR reaction mechanism, hydrothermal deactivation mechanism, poisoning resistance and synthetic methodology. The review gives a valuable summary of new insights into the matching between SCR catalyst design principles and the characteristics of Cu2+-exchanged zeolitic catalysts, highlighting the significant opportunity presented by zeolite-based catalysts. Principles for designing zeolites with excellent NH3-SCR performance and hydrothermal stability are proposed. On the basis of these principles, more hydrothermally stable Cu-AEI and Cu-LTA zeolites are elaborated as well as other alternative zeolites applied to NH3-SCR. Finally, we call attention to the challenges facing Cu-based small-pore zeolites that still need to be addressed.

关键词： environmental catalysis Cu-SSZ-13 NH3-SCR reaction mechanism small-pore zeolites

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Contrasting behavior for Li-Mg isotopes during subduction: Insights from garnet in the Yardoi schists， Tibet

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Journal of Earth Science 2022年

作者： Xing Li Yilin Xiao Olivier Nadeau Dongyong Li Haiyang Liu Zeming Zhang Zhenhui Hou Chinese Academy of Sciences Key Laboratory of Crust-Mantle Materials and Environments， School of Earth and Space Sciences， University of Science and Technology of China CAS Center for Excellence in Comparative Planetology Laboratory for Isotopes in Economic Geology and its Environment， Department of Mineral Resources and Engineering， School of Earth Sciences， China University of Geoscience Institute of Geology， Chinese Academy of Geological Sciences

It has long been recognized that garnet has the capacity to preserve the trace element and isotopic signature of distinct metamorphic growth zones because of its high closure temperature. Combined with the large size of certain garnet porphyroblast， this allows investigating variations in metamorphic conditions such as pressure， temperature， deviatoric stress， and fluid composition， which occur during subduction-related metamorphism. Here， one garnet porphyroblast of 6 cm diameter was sampled from the Yardoi schists of Tibet， and the major-， trace-， and Li-Mg isotopic compositions of distinct growth zones were determined in situ. The δ;Li values range from +6.0‰ to +4.1‰ and follow ‘S-shape’ patterns on both sides of the garnet’s core， revealing a two-stage growth process corresponding to the fluid-assisted sequential recrystallization of chlorite and micas during prograde metamorphism. By contrast， once corrected for the overprinting by retrograde metamorphism， the δ;Mg values vary monotonously from -1.73‰ in the core to -1.32‰ in the outer rim， reflecting a single-step process interpreted to result from increasing temperature and the solid-state recrystallization of chlorite-biotite during prograde metamorphism. This different behavior of Li and Mg isotopes is interpreted to result from the fact that Li is more fluid-mobile than the major element Mg.

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Heavy metals in sediments of Yellow Sea and East China Sea: Chemical speciation,distribution,influence factor,and contamination

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Journal of Oceanology and Limnology 2021年第4期39卷 1277-1292页

作者： Miao ZHAO Shenghui ZHANG Haitao HAN Dawei PAN Key Laboratory of Coastal Environmental Processes and Ecological Remediation Yantai Institute of Coastal Zone Research(YIC)Chinese Academy of Sciences(CAS)Coastal Environmental ProcessesResearch Center for Coastal Environment Engineering Technology of Shandong ProvinceYICCASYantai 264003China University of Chinese Academy of Sciences Beijing 100049China

Metal species and the degree of environmental pollution are related to the hydrogen sulfide(H_(2)S),an important product of early diagenesis that can react with metals to form stable *** investigate the eff ects of H_(2)S to metals and evaluate metal environment eff ect in the sediments of the East China Sea(ECS)and Yellow Sea(YS),geochemical characteristic and spatial distribution of nine heavy metals and H_(2)S profile were *** H_(2)S content and lower metal content was observed in the sediments 10 cm in depth in the North Yellow Sea and the west coast of South *** pollution load index(I_(pl))indicates that the southern coast of Shandong Peninsula underwent moderate pollution(I_(pl)=1)of heavy metals and no heavy metal pollution appeared in other areas(I_(pl)<1).To some extents,the ecological risk of Cd and As enrichment was moderately severe in all *** chance of heavy metal combination to be toxic in ECS and YS during summer was 21%.In addition,correlation between H_(2)S content and metals in both solid and porewater phases was obvious,corroborating important eff ect of H_(2)S on metal ***,H_(2)S could aff ect the spatial distributions of heavy metals in porewater directly and be indicative of potential biological eff ects of combined toxicant groups in the study region.

关键词： hydrogen sulfide heavy metal East China Sea and Yellow Sea sediment porewater risk assessment

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Catalytic Oxidation of Biorefractory Cyanide-Containing Coking Wastewater by Deconjugation Effect of Bimetal Copper-Loaded Activated Carbon

SSRN

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SSRN 2023年

作者： Chen, Acong Guan, Xianghong Pang, Zijun Ke, Xiong Qin, Zhi Chen, Yao Wei, Gengrui Wu, Haizhen Qiu, Guanglei Hu, Yun Wei, Chaohai School of Environment and Energy South China University of Technology Guangdong Guangzhou510006 China School of Environment and Energy Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling South China University of Technology Guangdong Guangzhou510006 China School of Biology and Biological Engineering South China University of Technology Guangdong Guangzhou510006 China

Due to the strong complexation and conjugation of various metal ions, the biorefractory low-concentration total cyanides (TCN) remain stable and tenacious in wastewater after physicochemical-biological treatment. This study proposes a copper-loaded activated carbon (AC/Cu) mechanism to effectively remove TCN in the complex system, where the bimetallic synergy of AC/Cu/Zn can enhance the cyanide removal capacity up to 24.78 mg-TCN/g-AC, which is superior to most as-reported technologies in thermodynamics and kinetics. This result can be attributed to the weakening conjugated effect of less-coordinated cuprous cyanide with a lower barrier of transition and ground state calculated by density functional theory (DFT). Then, the presence of coupled metal ions (such as Zn2+) exposes more free cyanide through complexation competition which is reflected in the further reduction of the transition state barrier. More importantly, the orbital hybridization is of general significance for the conjugate recombination and deconjugation of conjugated pollutants, which will provide a new direction for the removal of refractory pollutants. © 2023, The Authors. All rights reserved.

关键词： Activated carbon

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Self-assembled ping-pong chrysanthemum spherality NASICON cathode with intercalated structure enables ultralong lifespan and superior thermal safety

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Energy Storage Materials 2025年 79卷

作者： Qian, Chenghao Shi, Mengna Liu, Changcheng Bai, Qiang Huang, Que Pan, Yuelei He, Shengnan Zheng, Chao Guo, Li Chen, Yanjun School of Materials Science and Engineering North University of China Taiyuan Shanxi030051 China School of Environment and Safety Engineering North University of China Taiyuan030051 China Shanxi Key Laboratory of Efficient Hydrogen Storage & Production Technology and Application Institute of Advanced Energy Materials and Systems North University of China Taiyuan Shanxi030051 China College of Materials Science and Engineering Taiyuan University of Technology Taiyuan Shanxi030024 China State Key Laboratory of Fire Science University of Science and Technology of China Anhui Hefei230027 China Xi'an Technological University Institute of Science and Technology for New Energy Xian Shaanxi710021 China School of Energy and Power Engineering North University of China Taiyuan Shanxi030051 China School of Resources and Safety Engineering Central South University Changsha Hunan410010 China

Nowadays, morphological regulation and heteroatom substitution are dominated modified methods to optimize Na3V2(PO4)3 (NVP). Nevertheless, few studies could effectively combine these two routes. Herein, a facile sol-gel method is explored to successfully synthesize ping-pong chrysanthemum-like and Eu-substituted NVP system under the electrostatic self-assembly effects. Notably, the formation mechanism of this unique morphology is completely investigated by ex-situ SEM/Raman/XRD/FTIR. The highly innovative morphology possesses intercalated structure, which elevates the specific surface area and numerous active sites, conducive to reducing the Na+ diffusion distance and augmenting the interface area with the electrolyte. The introduced Eu3+ plays pillar effects by generating solid Eu-O bond and inducing the lengthen of V-O bond (from 1.97 Å to 2.03 Å) to expand the crystal framework and thus facilitating Na+ migration, which has been demonstrated by XAFS. Moreover, in-situ XRD reveals the charge compensation mechanism of reversible phase transition reaction in the Eu-doped NVP composite. The slighter volume shrinkage from 0.688 % to 0.159 % after Eu replacing V indicates the enhanced structural stability of Eu0.07@CNTs sample. Furthermore, DFT calculations deeply uncover the beneficial effects on electronic structure of Eu-substitution for NVP, containing the reduced DOS band energy and Na+ migration barrier, as well as lower binding energy between Na+ and NVP framework. Consequently, Eu0.07@CNTs achieves superior electrochemical performance in half and three type full cells. Moreover, ARC also verifies it has optimized thermal stability. © 2025 Elsevier B.V.

关键词： Sol-gel process

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Towards Fully Decoupled End-to-End Person Search

arXiv

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arXiv 2023年

作者： Zhang, Pengcheng Zheng, Jin Bai, Xiao Ning, Xin School of Computer Science and Engineering State Key Laboratory of Software Development Environment Jiangxi Research Institute Beihang University Beijing China Institute of Semiconductors Chinese Academy of Sciences Cognitive Computing Technology Joint Laboratory Wave Group Beijing China

End-to-end person search aims to jointly detect and re-identify a target person in raw scene images with a unified model. The detection task unifies all persons while the re-id task discriminates different identities, resulting in conflict optimal objectives. Existing works proposed to decouple end-to-end person search to alleviate such conflict. Yet these methods are still sub-optimal on one or two of the sub-tasks due to their partially decoupled models, which limits the overall person search performance. In this paper, we propose to fully decouple person search towards optimal person search. A task-incremental person search network is proposed to incrementally construct an end-to-end model for the detection and re-id sub-task, which decouples the model architecture for the two sub-tasks. The proposed task-incremental network allows task-incremental training for the two conflicting tasks. This enables independent learning for different objectives thus fully decoupled the model for persons earch. Comprehensive experimental evaluations demonstrate the effectiveness of the proposed fully decoupled models for end-to-end person search. Copyright © 2023, The Authors. All rights reserved.

关键词： Machine learning

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Enhancement of solid-liquid mixing state quality in a mechanical stired reactor with serial-chaotic rotation generated by basic speed method

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Chemosphere 2024年 349卷 140804页

作者： Liao, Yanan Wei, Naituan Liu, Jingjing Wang, Hua Xiao, Qingtai School of Mechanical Engineering Tongji University Shanghai201804 China State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and Technology Yunnan Kunming650093 China Greennovo Environmental Technology Co. Ltd. Yunnan Gejiu661000 China School of Mathematics Science and Engineering University of the Incarnate Word San AntonioTX78209 United States Faulty of Metallurgical and Energy Engineering Kunming University of Science and Technology Yunnan Kunming650093 China State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control Ministry of Ecology and Environment Hubei Wuhan430081 China

In this work, a novel controllable chaotic stirring strategy that basic speed with chaotic mappings is proposed to enhance the solid-liquid mixing state quality. Specially, the modern statistical image analysis technique is introduced to explore the intensification mechanism of the mixing process. Results show that the best experimental conditions are obtained by studying the influence of factors such as the type of chaotic mapping, the speed change time, and the basic speed on the mixing state quality. Moreover, the case in which the basic speed is set to 150 r/min generated by the cascaded Logistic-Cubic chaotic mapping is the best while the speed change time is set to 5 s and the fluctuation threshold is 30. The mixing time of this case is 50 s and the shortest, energy consumption is 1.64 × 104 W/m3 and appropriate, the solid particle suspension quality is 83 and the best. © 2023 Elsevier Ltd

关键词： Energy utilization

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Micro-nano structured VNb_(9)O_(25)anode with superior electronic conductivity for high-rate and long-life lithium storage

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Journal of Materials Science & technology 2021年第24期83卷 66-74页

作者： Mingxing Liang Yongcong Huang Yuda Lin Guisheng Liang Cihui Huang Lan Chen Jiaxin Li Qian Feng Chunfu Lin Zhigao Huang College of Physics and Energy Fujian Normal UniversityFujian Provincial Solar Energy Conversion and Energy Storage Engineering Technology Research CenterFuzhou 350117China Institute of Materials for Energy and Environment School of Materials Science and EngineeringQingdao UniversityQingdao 266071China Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials Fuzhou 350117China Fujian Provincial Collaborative Innovation Center for Advanced High-Field Superconducting Materials and Engineering Fuzhou 350117China

The oxygen vacancies and micro-nano structure can optimize the electron/Li+migration kinetics in anode materials for lithium batteries(LIBs).Here,porous micro-nano structured VNb_(9)O_(25)composites with rich oxygen vacancies were reasonably prepared via a facile solvothermal method combined with annealing treatment at 800℃for 30 h(VNb_(9)O_(25)-30 h).This micro-nano structure can enhance the contact of active material/electrolyte,and shorten the Li+diffusion *** introduction of oxygen vacancies can further boosts the intrinsic conductivity of VNb_(9)O_(25)-30 h for achieving excellent LIB *** as-prepared VNb_(9)O_(25)-30 h anode showed advanced rate capability with reversible capacity of 122.2 m A h g^(-1)at 4 A g^(-1),and delivered excellent capacity retention of~100%after 2000 ***,VNb_(9)O_(25)-30 h provides unexpected long-cycle life(i.e.,reversible capacity of 165.7 m A h g^(-1)at 1 A g^(-1)with a high capacity retention of 85.6%even after 8000 cycles).Additionally,coupled with the Li Fe PO4 cathode,the Li Fe PO4//VNb_(9)O_(25)-30 h full cell delivers superior LIB properties with high reversible capacities of 91.6 m A h g^(-1)at 5 C for 1000 ***,such reasonable construction method can assist in other high-performance niobium-based oxides in LIBs.

关键词： Lithium-ion batteries VNb_(9)O_(25)anode Micro-nano structure Oxygen vacancies Electrochemical performance

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Driving Forces of Residential Co2 Emission Inequality from the Perspective of Energy Use Pattern and Income Disparities

SSRN

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SSRN 2022年

作者： Chen, Lei Xu, Linyu Wang, Yongyang Xia, Linlin Yang, Zhifeng Key Laboratory for City Cluster Environmental Safety and Green Development Ministry of Education School of Ecology Environment and Resources Guangdong University of Technology Guangzhou510006 China Southern Marine Science and Engineering Guangdong Laboratory Guangzhou511458 China State Key Laboratory of Water Environment Simulation School of Environment Beijing Normal University Beijing100875 China

Carbon emissions from end-use energy consumption have been increasing for a long time and have become a major factor in the growth of regional carbon emissions, which has attracted widespread attention. The complex geographic-related climate situation and various development levels have created differences in residential energy use patterns and income changes, leading to inequalities in residential CO 2 emissions among regions. Therefore, this study investigated residential CO 2 emissions at a provincial scale in China during the period of 1997–2019. The objective was to establish a decomposition model of carbon inequality in order to propose policy recommendations for the differential reduction of carbon emissions. The findings showed that inequality decreased between 1997 and 2008, and then stabilized. Energy structure, energy intensity, and income per capita were the main factors explaining the differences in per capita carbon emissions among regions. The energy intensity effect was the main effect that decreased the inequality, while the energy use pattern increased it. For most inland regions, the within-group inequity in residential CO 2 emissions was mainly due to energy input per income, while the inequality of coastal regions could be explained by the differences in income per capita. Regarding energy use inequality, the energy intensity effect was the main driving force behind the inequality in heat and fuel energy use, but it had a smaller influence on the electricity consumption inequality. Regional targeted recommendations can help differentiate emission reduction plans among regions. © 2022, The Authors. All rights reserved.

关键词： Carbon dioxide

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A new assistant robot system for abdominal minimally invasive surgery

A new assistant robot system for abdominal minimally invasiv...

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IEEE International Conference on Robotics and Biomimetics

作者： Mei Feng Jinhui Li Xinze Jin Chao Wang Xiuquan Lu Yili Fu Key Laboratory of CNC Equipment Reliability Ministry of Education School of Mechanical and Aerospace Engineering Jilin University Changchun Jilin China State Key Lab Robot &Systems Harbin Institute of Technology Harbin Heilongjiang China

ISBN: (纸本)9781665481106

A new assistant robot system for abdominal minimally invasive surgery is proposed in this paper to meet the needs of traditional abdominal surgeries. The system is comprised primarily of a robotic arm system, end-effectors and a master manipulator. A novel remote center mechanism is proposed in the robotic arm system, furthermore, a flexible end-effector and a seven-degree-of-freedom master manipulator are designed independently. Based on this new assistant robot system for abdominal minimally invasive surgery, hand-eye coordination intuitive control is implemented, and relevant experiments are designed to validate the control system and control algorithm.

关键词： Medical robotics Minimally invasive surgery Robot kinematics Instruments Force Control systems Main-secondary

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