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液氮浓缩富集气相色谱脉冲氦离子化检测器测定燃料氢中甲醛

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化工设计通讯 2024年第1期50卷 15-18页

作者：李朝清纪艳艳王祥科朗析仪器(上海)有限公司上海201702

氢燃料电池汽车因其零排放、续航里程高、环境适应性强等优势,一直被视为未来新能源汽车发展的主要方向。氢中甲醛对燃料电池有毒害作用,影响着燃料电池性能和使用寿命。高纯氢气稀释甲醛模拟燃料氢中甲醛检出限测定,以液氮容量为主要... 详细信息

氢燃料电池汽车因其零排放、续航里程高、环境适应性强等优势,一直被视为未来新能源汽车发展的主要方向。氢中甲醛对燃料电池有毒害作用,影响着燃料电池性能和使用寿命。高纯氢气稀释甲醛模拟燃料氢中甲醛检出限测定,以液氮容量为主要影响因素研究液氮浓缩富集测定甲醛检出限为3×10^(-9),RSD为2.7%,结果远超于GB/T 37244—2018中规定的甲醛检出限。满足相关检测规范要求,进一步优化了氢中甲醛测定方法。

关键词：燃料氢甲醛液氮浓缩检出限气相色谱

单TCD检测器气相色谱法快速测定天然气组分

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低温与特气 2024年第2期42卷 28-32页

作者：纪艳艳王祥科钱阿慧朗析仪器(上海)有限公司上海201702

天然气是绿色高效的清洁能源,与可再生能源形成良性互补,充分认识天然气组分可以推进天然气的利用。以天然气标准物质为对象研究色谱仪器条件对天然气分析的影响,包括色谱柱类型、阀切时间、柱箱温度等方面,建立了良好的分析方法,用外... 详细信息

天然气是绿色高效的清洁能源,与可再生能源形成良性互补,充分认识天然气组分可以推进天然气的利用。以天然气标准物质为对象研究色谱仪器条件对天然气分析的影响,包括色谱柱类型、阀切时间、柱箱温度等方面,建立了良好的分析方法,用外标法确定了天然气各组分的保留时间。使用该气相色谱法测定天然气组分具有重复性好、准确度高和分析时间短等特点,可为分析检测天然气成分提供重要参考,对天然气生产和运输质量控制具有重要意义。

关键词：天然气组分气相色谱法气路系统标准气体

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涡环输送特性的实验与仿真分析

机械制造与自动化 2024年第1期53卷 143-148页

作者：纪妍妍韩东何纬峰朱德志彭涛南京航空航天大学能源与动力学院江苏南京210016 江苏乐科节能科技股份有限公司江苏泰州214501

为探究结构变化对涡环输送的作用,设计一种基于空气驱动活塞运动模式的空气涡环发生器,采用实验方法研究了涡环发生器的长径比、环径比及活塞停顿时间对涡环输送特性的影响,通过数值仿真对涡环输送过程的速度场和压力场进行分析。结果表... 详细信息

为探究结构变化对涡环输送的作用,设计一种基于空气驱动活塞运动模式的空气涡环发生器,采用实验方法研究了涡环发生器的长径比、环径比及活塞停顿时间对涡环输送特性的影响,通过数值仿真对涡环输送过程的速度场和压力场进行分析。结果表明:长径比与环径比对涡环输送特性影响较大,活塞停顿时间的影响较小,其中涡环输送的最远距离为277 cm;长径比过大会造成较大沿程损失,环径比过大会造成较大局部损失,阻碍涡环的生成和输送,而涡环具有在较小能量耗散的同时远距离输送的特性。

关键词：涡环输送特性距离长径比环径比活塞

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Mesoporous zeolites for biofuel upgrading and glycerol conversion

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Frontiers of Chemical Science and Engineering 2018年第1期12卷 132-144页

作者： jian Zhang Liang Wang yanyan ji Fang Chen Feng-Shou Xiao Key Laboratory of Applied Chemistry of Zhejiang Province and Department of Chemistry Zhejiang University Hangzhou 310028 China Key Laboratory of Biomass Chemical Engineering of Ministry of Education Zhejiang University Hangzhou 310027 China

With the recent emphasis and development of sustainable chemistry, the conversion of biomass feed- stocks into alternative fuels and fine chemicals over various heterogeneous catalysts has received much attention. In particular, owing to their uniform micropores, strong acidity, and stable and rigid frameworks, zeolites as catalysts or co-catalysts have exhibited excellent catalytic performances in many reactions, including hydrodesulfurization, Fischer-Tropsch synthesis, and hydrodeoxygenation. However, the relatively small sizes of the zeolite micropores strongly limit the conversion of bulky biomolecules. To overcome this issue, mesoporous zeolites with pores larger than those of biomolecules have been synthesized. As expected, these mesoporous zeolites have outperformed conventional zeolites with improved activ- ities, better selectivities, and longer catalyst lives for the upgrading of pyrolysis oils, the transformation of lipids into biofuels, and the conversion of glycerol into acrolein and aromatic compounds. This review briefly summarizes recent works on the rational synthesis of mesoporous zeolites and their superior catalytic properties in biomass conversion.

关键词： biomass conversion mesoporous zeolite sustainable chemistry

Secure network coding from secure proof of retrievability

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Science China(Information Sciences) 2021年第12期64卷 252-253页

作者： jinyong CHANG Bilin SHAO yanyan ji Maozhi XU Rui XUE School of Information and Control Engineering Xi'an University of Architecture and Technology School of Management Xi'an University of Architecture and Technology School of Mathematical Sciences Peking University State Key laboratory of Information Security Institute of Information EngineeringChinese Academy of Sciences

Dear editor,Compared with the traditional storing-and-forwarding routing mechanism, network coding has become a more attractive paradigm because it has been proven capable of achieving maximized throughput, enhanced r... 详细信息

关键词： Network Coding Proof of Retrievability Random Oracle Provable Security Cloud Storage

High-efficient Synthesis of Zeolite LTA via a Wet-gel Crystallization Route

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Chemical Research in Chinese Universities 2017年第4期33卷 520-524页

作者： ji yanyan ZHANG Bing ZHANG Wu ZHAO Bo LI Hongbo WANG Dongmei LI Ying School of Environmental and Chemical Engineering State Key Laboratory of Separation Membranes and Membrane and Processes Tianjin Polytechnic University Tianjin 300387 P. R. China College of Marine and Environment Science Tianjin Key Laboratory of Marine Resources and Chemistry Tianjin University of Science and Technology Tianjin 300457 P. R. China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University Changchun 130012 P. R. China

Zeolite LTA has been largely used as good adsorbent and detergent builder with a huge amount of demand Numerous efforts have been devoted to the exploration of new synthetic methods for preparing zeolites more conve- niently and efficiently. Herein, we reported a wet-gel crystallization route to synthesize zeolite LTA from simple filtration of the initial reaction mixture followed by heating for crystallization. The products were characterized in detail by means of X-ray diffraction, Raman spectra, scanning electron microscopy and elemental analysis. The yields of the solid products were also investigated, which suggested that the wet-gel method afforded an obvious improve- ment of products yield compared with the conventional synthesis route. For application as detergent builder, the cal- cium ion exchange rates of the wet-gel synthesized zeolites were similar with that of conventional LTA zeolites. Therefore the wet-gel route would be potentially important in industry due to its advantages of easy-performing, high-yielding and energy-saving.

关键词： Zeolite LTA Hydrothermal crystallization Wet-gel crystallization route Calcium ion exchange property

Light People: Professor Fanglin Bao and his cover story

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Light(Science & Applications) 2024年第6期13卷 1015-1020页

作者： ji Wang School of Science Westlake UniversityHangzhouZhejiangPR China

Qu Yuan,a renowned ancient Chinese poet,once pondered in his work Heavenly Inquiry:“If the sun’s light is absent,from where does the radiance of the Hero Flower emanate?”The ability to see clearly in the darkest of nights has long been a sought-after magical power by *** holds not only immense technological significance for computer vision and remote sensing but also profound implications for transcending the dichotomy between day and night in our daily *** Fanglin Bao from Westlake University has made significant breakthroughs in this field,bringing us closer to a world where we can transform night into *** groundbreaking research on Heat-Assisted Detection and Ranging(HADAR)and night vision was featured as the cover story in Nature on July 26,2023.

关键词： bringing breakthrough holds

Trend of Developing Aqueous Liquid and Gel Electrolytes for Sustainable,Safe,and High‑Performance Li‑Ion Batteries

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Nano-Micro Letters 2024年第1期16卷 17-34页

作者： Donghwan ji Jaeyun Kim School of Chemical Engineering Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea Department of Health Sciences and Technology Samsung Advanced Institute for Health Sciences&Technology(SAIHST)Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea Biomedical Institute for Convergence at SKKU(BICS) Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea Institute of Quantum Biophysics(IQB) Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea Present Address:Department of NanoEngineering University of California San DiegoLa JollaSan DiegoCA 92093USA

Current lithium-ion batteries(LIBs)rely on organic liquid electrolytes that pose significant risks due to their flammability and *** potential for environmental pollution and explosions resulting from battery damage or fracture is a critical ***-based(aqueous)electrolytes have been receiving attention as an alternative to organic ***,a narrow electrochemicalstability window,water decomposition,and the consequent low battery operating voltage and energy density hinder the practical use of aqueous ***,developing novel aqueous electrolytes for sustainable,safe,high-performance LIBs remains *** Review first commences by summarizing the roles and requirements of electrolytes–separators and then delineates the progression of aqueous electrolytes for LIBs,encompassing aqueous liquid and gel electrolyte development trends along with detailed principles of the *** aqueous electrolytes are progressed based on strategies using superconcentrated salts,concentrated diluents,polymer additives,polymer networks,and artificial passivation layers,which are used for suppressing water decomposition and widening the electrochemical stability window of water of the *** addition,this Review discusses potential strategies for the implementation of aqueous Li-metal batteries with improved electrolyte–electrode interfaces.A comprehensive understanding of each strategy in the aqueous system will assist in the design of an aqueous electrolyte and the development of sustainable and safe high-performance batteries.

关键词： Lithium-ion battery(LIB) Aqueous electrolyte Gel electrolyte Electrochemical stability window Li dendrite

Photocatalytic activation of sulfite by N-doped porous biochar/MnFe_(2)O_(4) interface-driven catalyst for efficient degradation of tetracycline

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Green Energy & Environment 2024年第3期9卷 481-494页

作者： Long Cheng Yuanhui ji jiangsu Province Hi-Tech Key Laboratory for Biomedical Research School of Chemistry and Chemical EngineeringSoutheast UniversityNanjing211189China

A novel photo-catalytic system composed of N-doped biochars(NBCs),MnFe_(2)O_(4) and sulfite activation under ultraviolet(NBCs/MnFe_(2)O_(4)/sulfite/UV)was constructed to realize the efficient eliminate of tetracycline(TC).As the carrier of MnFe_(2)O_(4),NBCs were synthesized from alfalfa,which has large specific surface area,graphite like structure and hierarchical porous *** adsorption isotherm indicated that NBCs/MnFe_(2)O_(4)-2:1 had the best adsorption performance for TC(347.56 mg g^(-1)).Through synergistic adsorption and photocatalysis,the removal rate of TC reached 84%,which was significantly higher than that of MnFe_(2)O_(4).Electrochemical impedance spectroscopy(EIS)and Photoluminescence(PL)characterization results showed that the introduction of NBCs improved the separation efficiency of photogenerated electron and hole pairs and enhanced the photocatalytic ***,the adsorption,degradation mechanism and degradation path of TC by the catalyst were systematically analyzed by coupling HPLC–MS measurement with the theoretical *** the advantages of excellent degradation performance,low cost,easy separation and environmental friendliness of NBCs/MnFe_(2)O_(4),this work was expected to provide a new path for the practical application of biochar.

关键词： Biochar MnFe_(2)O_(4) Sulfite Adsorption Photocatalysis