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Separated Active Site and Reaction Space for Multi-Pollutant Elimination Significantly Enhancing Low Toxic Product Selectivity

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advanced Functional Materials 2023年第48期33卷

作者： Wei, Lu Liu, Yuxi Cui, Suping Wang, Can Hsi, Hsing-Cheng Duan, Erhong Peng, Yue Dai, Hongxing Guo, Guangsheng Deng, Jiguang Key Laboratory of Beijing on Regional Air Pollution Control Beijing Key Laboratory for Green Catalysis and Separation Center of Excellence for Environmental Safety and Biological Effects Beijing University of Technology Beijing100124 China Faculty of Materials and Manufacturing Key Laboratory of Advanced Functional Materials Ministry of Education Beijing University of Technology Beijing100124 China School of Environmental Science and Engineering Tianjin University Tianjin300350 China Graduate Institute of Environmental Engineering National Taiwan University Taipei10617 Taiwan School of Environmental Science and Engineering Hebei University of Science and Technology Hebei050018 China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

It is possible to remove volatile organic compounds containing chlorine (CVOCs, such as chlorobenzene) in a single device designed for selective catalytic reduction of NOx with NH3 for the industries containing CVOCs and NOx. Breaking the efficiency-selectivity trade-off in chlorobenzene oxidation remains a major challenge due to the conjugation of halogen atoms with the benzene ring and the reducing nature of NH3. A stepwise synthesis strategy is demontrated to disperse dual Ru/Cu Lewis acid sites outside and inside the zeolite channel. Under the confinement of zeolite, the Ru4+ Lewis acid site on the external surface of the zeolite promotes chlorobenzene oxidation by weakening the p-π conjugate structure of Cl and benzene ring, while the Cu2+ Lewis acid site within the internal channel converts NOx and NH3 to N2. The mutual interference between catalytic oxidation and reduction is successfully avoided. Therefore, the low toxic CO2 and HCl selectivity experience a considerable increase from 21% to 86%, and from 51% to 94% with 91% conversion of chlorobenzene, while maintaining excellent elimination performance for NO (with N2 selectivity exceeding 90%). The incorporation of separated active sites and reaction spaces into the design may offer potentials for other energy and environmental applications. © 2023 Wiley-VCH GmbH.

关键词： Zeolites

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Application of smog chambers in atmospheric process studies

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National Science Review 2022年第2期9卷 126-141页

作者： Biwu Chu Tianzeng Chen Yongchun Liu Qingxin Ma Yujing Mu Yonghong Wang Jinzhu Ma Peng Zhang Jun Liu Chunshan Liu Huaqiao Gui Renzhi Hu Bo Hu Xinming Wang Yuesi Wang Jianguo Liu Pinhua Xie Jianmin Chen Qian Liu Jingkun Jiang Junhua Li Kebin He Wenqing Liu Guibin Jiang Jiming Hao Hong He State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Center for Excellence in Regional Atmospheric Environment Institute of Urban Environment Chinese Academy of Sciences College of Resources and Environment University of Chinese Academy of Sciences Aerosol and Haze Laboratory Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology Beijing Convenient Environmental Tech Co.Ltd Key Laboratory of Environmental Optics and Technology Anhui Institutes of Optics and Fine Mechanics Chinese Academy of Sciences State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric Physics Chinese Academy of Sciences State Key Laboratory of Organic Geochemistry and Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization Guangzhou Institute of Geochemistry Chinese Academy of Sciences Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention Department of Environmental Science and Engineering Fudan University State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University

Smog chamber experimental systems,which have been widely used in laboratory simulation for studying atmospheric processes,are comprehensively reviewed in this *** components,development history,main research topics and main achievements of smog chambers are *** smog chambers in the world,including their volumes,wall materials,light sources and features,are summarized and *** factors of smog chambers and their influences on the simulation of the atmospheric environment are discussed,including wall loss,wall emission and background *** features of next-generation smog chambers and their application prospect in future studies of the atmospheric environment are also outlined in this paper.

关键词： smog chamber simulation wall effect secondary aerosol ozone

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Effects of Wo3 and Moo3 Loadings on Vanadia-Based Catalysts for Nh3-Scr: Revealed by in Situ Infrared and Two-Dimensional Correlation Spectroscopy

SSRN

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SSRN 2023年

作者： Lv, Zhihui He, Guangzhi Ge, Yanli Liu, Yongchun Yu, Yunbo He, Hong State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China University of Chinese Academy of Sciences Beijing100049 China State Key Joint Laboratory of Environmental Simulation and Pollution Control Beijing Innovation Center for Engineering Science and Advanced Technology College of Environmental Science and Engineering Peking University Beijing100871 China Aerosol and Haze Laboratory Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology Beijing100029 China Ganjiang Innovation Academy Chinese Academy of Sciences Ganzhou341000 China Center for Excellence in Regional Atmospheric Environment Key Laboratory of Urban Pollutant Conversion Institute of Urban Environment Chinese Academy of Sciences Xiamen361021 China

Vanadia-based catalysts have been widely applied in NOx reduction, while the promoting effects of WO3 and MoO3 are still under debate. Herein, we prepared V2O5/TiO2, V2O5-WO3/TiO2, and V2O5-MoO3/TiO2 catalysts and revealed that WO3 and MoO3 enhanced the activity of V2O5/TiO2, especially under wet conditions. In situ DRIFTS, two-dimensional correlation spectroscopy (2D COS), and DFT calculations demonstrated that NH3 adsorbed on Lewis acid sites of V2O5/TiO2, resulting in the formation of NH3ads-L1 (1284 cm-1, Ti sites of O=V-O-Ti) and NH3ads-L2 (1604 cm-1, V=O sites). By using 2D COS, we found that the NH3ads-L1 exhibited higher reactivity towards NO to produce NH2NO* via NH2*, which was promoted by WO3. Moreover, WO3 and MoO3 doping inhibited H2O adsorption, and promoted its desorption by increasing temperature, thus protecting the V=O sites on V2O5/TiO2. Also, 2D COS provided a new perspective for in-depth understanding of the active sites and intermediates in the NH3-SCR reaction. © 2023, The Authors. All rights reserved.

关键词： Catalysts

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Time-Resolved in Situ Infrared and Two-Dimensional Correlation Spectroscopy of V2o5/Tio2: Effects of Wo3 and Moo3 Loadings for Nh3-Scr

SSRN

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SSRN 2023年

Vanadia-based catalysts are widely applied in NOx reduction, while the promoting effect of WO3 and MoO3 is still under debate. Herein, we prepared V2O5/TiO2, V2O5-WO3/TiO2, and V2O5-MoO3/TiO2 catalysts and revealed that WO3 and MoO3 enhanced the activity of V2O5/TiO2, particularly under wet conditions. In situ DRIFTS, two-dimensional correlation spectroscopy (2D COS), and DFT calculations demonstrated that NH3 adsorption on Lewis acid sites of V2O5/TiO2 resulted in the formation of NH3ads-L1 (1284 cm-1, Ti sites of O=V-O-Ti) and NH3ads-L2 (1604 cm-1, V=O sites). By using 2D COS, we firstly found that the NH3ads-L1 exhibited higher reactivity towards NO to produce NH2NO* via NH2*, which was promoted by WO3. Moreover, WO3 and MoO3 doping inhibited H2O adsorption, and promoted its desorption at elevated temperature, thus protecting the V=O sites on V2O5/TiO2. Also, 2D COS analysis provides a new perspective for in-depth understanding of the active sites and intermediates in NH3-SCR reaction. © 2023, The Authors. All rights reserved.

关键词： Catalysts

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Improved thermal properties and CMAS corrosion resistance of rare-earth monosilicates by adjusting the configuration entropy with RE-doping

SSRN

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SSRN 2023年

作者： He, Yuxuan Xiao, Guozheng Wang, Chao Lu, Xuefeng Li, Liuyuan Liu, Shiying Wu, Yusheng Lin, Jun Liang Wang, Zhanjie School of Materials Science and Engineering Shenyang University of Technology Shenyang110870 China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal Lanzhou University of Technology Lanzhou730050 China Hunan Aviation Powerplant Research Institute Aero Engine Corporation of China Zhuzhou412002 China

The novel rare earth monosilicates (xRE1/x)2SiO5 (RE=Yb, Tm, Er, Y, Dy and Tb, x=2-6) were prepared in order to establish the relationship between configurational entropy and lattice distortion, and explore the effect of configurational entropy on performance. The lattice distortion of (xRE1/x)2SiO5 increased gradually with the increase of configurational entropy, but the multi-principal component solid solution tended to form a highly symmetrical crystal structure when the configurational entropy was large enough, thus inhibiting the lattice distortion. (5RE1/5)2SiO5 had a maximum lattice distortion, which leaded to a relatively low thermal conductivity and coefficient of thermal expansion, and good CMAS corrosion resistance. © 2023, The Authors. All rights reserved.

关键词： Corrosion resistance

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Augmenting photoluminescence of monolayer MoS_(2) using high order modes in a metal dimer-on-film nanocavity

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Photonics Research 2021年第4期9卷 501-506页

作者： Shiyin Cao Liping Hou Qifa Wang Chenyang Li Weixing Yu Xuetao Gan Kaihui Liu Malin Premaratne Fajun Xiao Jianlin Zhao MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information TechnologySchool of Physical Science and TechnologyNorthwestern Polytechnical UniversityXi’an 710129China Key Laboratory of Spectral Imaging Technology of Chinese Academy of Sciences Xi’an 710119China State Key Laboratory for Mesoscopic Physics Collaborative Innovation Centre of Quantum MatterSchool of PhysicsPeking UniversityBeijing 100871China Advanced Computing and Simulation Laboratory(AχL) Department of Electrical and Computer Systems EngineeringMonash UniversityClaytonVIC 3800Australia

Plasmonic particle-on-film nanocavities,supporting gap modes with ultra-small volume,provide a great solution to boost light–matter interactions at the *** this work,we report on the photoluminescence(PL)enhancement of monolayer MoS_(2) using high order modes of an Au nanosphere dimer-on-film nanocavity(DoFN).The high order plasmon modes,consisting of two bonding quadrupoles in the dimer and their images in the Au film,are revealed by combining the polarization-resolved scattering spectra with the numerical *** integrating the monolayer MoS_(2) into the DoFN,these high order modes are used to enhance PL intensity through simultaneously boosting the absorption and emission processes,producing a 1350-fold enhancement *** opens an avenue to enhance the light–matter interaction with high order plasmon modes and may find applications in future optoelectronics and nanophotonics devices.

关键词： cavity high integrating

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Enhanced Clutter Suppression and GMTIm Algorithm with Modified DKP and NCS for Single-Channel Spaceborne-Maneuvering BFSAR

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IEEE Transactions on Geoscience and Remote Sensing 2025年 63卷

作者： Liu, Yuzhou Song, Xuan Li, Yachao Wang, Yitao Guo, Yanhong Ye, Pei Wang, Xuanqi Shi, Guangming Xidian University National Key Laboratory of Radar Signal Processing Xi’an710071 China Northwestern Polytechnical University School of Astronautics Xi’an710072 China DalianNaval Academy Operation Software and Simulation Institute Dalian116018 China Dalian University of Technology Institute for Advanced Intelligence Dalian116024 China Xidian University School of Physics Xi’an710071 China Xidian University School of Artificial Intelligence Xi’an710071 China Peng Cheng Laboratory Shenzhen518055 China

Single-channel spaceborne-maneuvering bistatic forward-looking synthetic aperture radar (SS-BFSAR) enables the maneuvering platform to achieve high-resolution forward-looking imaging without deploying additional antennas or transmitting the radar signal. Nevertheless, achieving the suppression of spatial variant clutter with only the single-channel configuration remains a critical challenge for the ground moving target imaging (GMTIm) mission of SS-BFSAR. This study proposes an enhanced clutter suppression and GMTIm algorithm for SS-BFSAR. First, the proposed modified deramp-keystone processing (DKP) completely decouples the echo signal in range and azimuth while avoiding the signal-to-clutter ratio (SCR) degradation caused by the azimuth spectrum aliasing. Subsequently, two pre-focusing approaches are developed with nonlinear chirp scaling (NCS), i.e., global NCS and block NCS, to achieve deep focusing of spatial variant clutter while introducing differences of Doppler frequency position (DFP) between the clutter and GMT. These approaches preserve the clutter consistency of the pre-focus results, thereby ensuring that the GMT signal exhibits high SCR following the image domain cancellation. Finally, a matched filter and the proposed monostatic-equivalent model are used to refocus the GMT and estimate its velocity. The proposed algorithm can simultaneously obtain the well-focused ground scene image and the GMTIm result without DFP drift caused by the target’s motion. Comparative experiments using simulation and real data demonstrate the effectiveness and superiority of the proposed algorithm. © 1980-2012 IEEE.

关键词： Echo suppression

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ACTIVE POWER CONTROL STRATEGY DEPENDING ON FREQUENCY FOR MMC-HVDC SYSTEM CONNECTED TO OFFSHORE WINDFARMS 22

ACTIVE POWER CONTROL STRATEGY DEPENDING ON FREQUENCY FOR MMC...

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22nd International Symposium on High Voltage Engineering, ISH 2021

作者： Li, Fangyuan Zhu, Lin Zhou, Jiapei Kou, Longze Ren, Bixing State Key Laboratory of Advanced Power Transmission Technology China Beijing Key Laboratory of DC Grid Technology & Simulation China Global Energy Interconnection Research Institute Co. Ltd Beijing China Electric Power Research Institute of State Grid Jiangsu Electric Power Co. Ltd China State Grid Jiangsu Electric Power Co. Ltd China

ISBN: (纸本)9781839536052

The study proposes an active power control strategy of the modular multilevel converter (MMC) for connecting large offshore windfarms. The strategy can be used to enhance the frequency stability of onshore alternating current (AC) system. It considers the working principle of windfarms, and can tightly control the output of active power of offshore network, which contributes to onshore frequency regulation by a changeable transmission of the offshore wind energy. The dynamic performance of the High Voltage Direct Current (HVDC) based on MMC system using the proposed methods has been verified by PSCAD/EMTDC simulations. In different scenarios, the HVDC system can adjust active power accurately depending on the onshore frequency which confirms the feasibility of the methods. © 2021 The Institution of Engineering and technology.

关键词： Offshore oil well production

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Analysis And Calculation Of The Short-Circuit Current Of Xiamen VSC-HVDC Project

Analysis And Calculation Of The Short-Circuit Current Of Xia...

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IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Lin Zhu Huaiguang Gu Fangyuan Li Longze Kou Dong Liu State Key Laboratory of Advanced Power Transmission Technology Beijing Key Laboratory of DC Grid Technology and Simulation Global Energy Interconnection Research Institute Beijing China State Key Laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research Institute Beijing China

ISBN: (纸本)9781665434263

For the heavy load urban power grid, the short-circuit current is closed to the breaking capacity of the AC breaker. After the voltage sourced converter high voltage direct current (VSC-HVDC) is connected, the short-circuit current of VSC-HVDC will be provided during the fault period, which will cause the short-circuit current exceed the standard value and affect the normal operation of the power grid. Taking the Xiamen VSC-HVDC project as an example, this paper analyses the VSC-HVDC control mode, obtains the short-circuit current calculation method. The Xiamen AC / DC hybrid model is built, and the correctness of the proposed method is verified by simulation. The results show that the amplitude and phase angle of the VSC-HVDC short-circuit current have great influence on the total short-circuit current, and the amplitude is easily controlled by the current limiting controller, so the phase angle control should be emphasized. For Point of Common Coupling (PCC), the short-circuit current of single-phase grounding fault may be larger than three-phase grounding fault, which should be taken into account. The ideas provided in this paper have practical engineering significance for the city power supply by VSC-HVDC.

关键词： Reactive power Grounding Short-circuit currents simulation Urban areas System integration Transformers

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Morphological modifications of C60 crystal rods under hydrothermal conditions

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Chinese Physics B 2020年第12期29卷 506-510页

作者： Ming-Run Du Shi-Xin Liu Jia-Jun Dong Ze-Peng Li Ming-Chao Wang Tong Wei Qing-Jun Zhou Xiong Yang Peng-fei Shen College of Science Civil Aviation University of ChinaTianjin 300300China State Key Laboratory of Superhard Materials College of PhysicsJilin UniversityChangchun 130012China Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyShenzhen 519055China

We observed morphological modification of rod-shaped C60 solvate crystals using a facile hydrothermal *** initial C60 rods were changed from smooth rods to rough rods,porous rods or pieces under different hydrothermal *** the hydrothermal treatment,the initial samples underwent a decomposition-recrystallization process,which can be tuned by the content of alcohol in the hydrothermal solution,thereby leading to modification of the morphological properties of the initial C60 *** addition,the rough and porous C60 rods prepared in our work exhibit excellent photoluminescence intensities that are approximately 7 and 3 times higher than those of pure C60 powders,*** results suggest that the hydrothermal method is a potential route for fabricating fullerene materials with controllable morphologies and novel functions.

关键词： fullerene crystals morphological modification porous materials hydrothermal method

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