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MCM-41 supported nano-sized CuO-CeO2 for catalytic combustion of chlorobenzene

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Journal of Rare Earths 2020年第9期38卷 933-940,I0001页

作者： Jie Zheng zhu chen Jianfei fang zhuo Wang Shufeng Zuo Zhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process Shaoxing UniversityShaoxing 312000China Quality and Technical Supervision Inspection Center of Yongkang Yongkang 321300China

In this paper,MCM-41 was synthesized by a soft template technique and MCM-41 supported CuO-CeO2 nano-sized catalysts with different Cu/Ce molar ratios were prepared by a deposition-precipitation method.N2 adsorption,HRTEM-EDS,H2-TPR,XPS characterization,as well as catalytic activity and durability tests for the catalytic combustion of chlorobenzene(CB)were conducted to explore the relationship between the structure and catalytic performance of the *** is revealed that cuCe(6:1)/MCM-41 has the highest activity and can completely catalyze the degradation of CB at 260℃.The reasons for the high activity of the catalysts are as follows:MCM-41,a type of mesoporous material which has large pore size and large specific surface area,is suitable as a catalyst *** average diameter of nano-sized CuO and CeO2 particles is about 3-5 nm and adding CeO2 improves the dispersion of active component CuO,which are highly and evenly dispersed on the surface of *** results also explain why MCM-41 supported CuO-CeO2 with appropriate proportion can highly enhance the catalytic *** reason is that CeO2 acting as an oxygen-rich material can improve the mobility of oxygen species through continuous redox between Ce4^+and Ce3^+,and improve the catalytic performance of CuO for CB ***,CuCe(6:1)/MCM-41 also displays good durability for CB combustion,both in the humid condition and in the presence of benzene,making it a promising catalytic material for the elimination of chlorinated VOCs.

关键词： CuO-CeO2 MCM-41 Nano-sized Chlorobenzene Catalytic combustion Rare earths

Optimization of rare earth carbonate reactive-crystallization process based on response surface method

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Journal of Rare Earths 2021年第1期39卷 98-104,I0004页

作者： Dongmei zhu Qianwen chen Tingsheng Qiu Guanfei Zhao Xihui fang School of Resource and Environmental Engineering Jiangxi University of Science and TechnologyGanzhou 341000China School of Mineral Processing and Bioengineering Central South UniversityChangsha 410083China

Rare earth carbonate precipitation is mainly amorphous,of large volume and difficult to *** prepare crystalline rare earth carbonate,mother liquor of heavy rare earth was taken as research object,and the experimental scheme was designed based on the response surface central composite design(CCD)*** concentration of mother liquor,aging time and seed crystal dosage were taken as independent variables,and the particle size of rare earth carbonate was taken as the response value to establish a quadratic polynomial numerical model to optimize the reactive-crystallization process of rare earth *** results show that these three factors have significant effect on the particle size of rare earth carbonate,and the influence order is mother liquid concentration>aging time>seed crystal ***,the interaction between mother liquor concentration and seed crystal dosage has a significant effect on the size of rare earth carbonate *** optimal parameters predicted by the model are as follows:the concentration of mother liquid is 1.75 g/L,seed crystal dosage is 13.56 wt%,and aging time is 8 *** these conditions,the predicted particle size is 28.74μm,and the experiment particle size is 28.23μm,between both,the relative error is 0.73%,which indicates that the established response surface model has a good prediction effect and a certain practical significance to guide the reactive-crystallization process of rare earth *** obtained rare earth carbonate has a crystallinity of 97.82%,uniform particles size,and low-hydrated crystals with a tengerite structure.

关键词： Rare earth carbonate Reactive-crystallization Process optimization Response surface method Seed crystal

Study of nanoscratching of polymers by using molecular dynamics simulations

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Science China(Physics,Mechanics & Astronomy) 2013年第9期56卷 1760-1769页

作者： YUAN DanDan zhu PengZhe fang FengZhou QIU chen State Key Laboratory of Precision Measuring Technology and Instruments Centre of MicroNano Manufacturing TechnologyTianjin University

Molecular dynamic simulations are performed to study the nanoscratching behavior of *** effects of scratching depth,scratching velocity and indenter/polymer interaction strength are *** is found that polymer material in the scratching zone around the indenter can be removed in a ductile manner as the local temperature in the scratching zone exceeds glass transition temperature *** recovery of polymer can be more significant when the temperature approaches or exceeds *** tangential force,normal force and friction coefficient increase as the scratching depth increases.A larger scratching velocity leads to more material deformation and higher *** tangential force and normal force are larger for a larger scratching velocity whereas the friction coefficient is almost independent of the scratching velocities *** is also found that stronger indenter/polymer interaction strength results in a larger tangential force and friction coefficient.

关键词： polymer nanoscratching molecular dynamics

SnNi nanoneedles assembled 3D radial nanostructure loaded with SnNiPt nanoparticles： Towards enhanced electrocatalysis performance for methanol oxidation

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Nano Research 2017年第11期10卷 3929-3940页

作者： Hao fang Yuting chen Ming Wen Qingsheng Wu Quanjing zhu School of Chemical Science and Engineering Shanghai Key Laboratory of Chemical Assessment and Sustainability Education Ministry Key Laboratory of Yangtze River Water Environment Tongji University 1239 Siping Road Shanghai 200092 China

A desirable methanol oxidation electrocatalyst was fabricated by metal atom diffusion to form an alloy of an assembled three-dimensional （3D） radial nanostructure of SnNi nanoneedles loaded with SnNiPt nanoparticles （NPs）.Herein,metal atom diffusion occurred between the SnNi support and loaded Pt NPs to form a SnNiPt ternary alloy on the catalyst *** as-obtained catalyst combines the excellent catalytic performance of the alloy and advantages of the 3D nanostructure;the SnNiPt NPs,which fused on the surface of the SnNi nanoneedle support,can dramatically improve the availability of Pt during electrocatalysis,and thus elevate the catalytic *** addition,the efficient mass transfer of the 3D nanostructure reduced the onset ***,the catalyst achieved a favorable CO poisoning resistance and enhanced *** atomic interdiffusion,the catalytic activity drastically increased by 45%,and the other performances substantially *** results demonstrate the significant advantage and enormous potential of the atomic interdiffusion treatment in catalytic applications.

关键词： three-dimensional (3D) nanostructure SnNiPt ternary alloy electrocatalysis methanol oxidation reaction direct methanol fuel cell anode catalyst

Einstein Probe discovery of EP240408a: A peculiar X-ray transient with an intermediate timescale

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 222-240页

作者： Wenda Zhang Weimin Yuan Zhixing Ling Yong chen Nanda Rea Arne Rau Zhiming Cai Huaqing cheng Francesco Coti Zelati Lixin Dai Jingwei Hu Shumei Jia Chichuan Jin Dongyue Li Paul O’Brien Rongfeng Shen Xinwen Shu Shengli Sun Xiaojin Sun Xiaofeng Wang Lei Yang Bing Zhang chen Zhang Shuang-Nan Zhang Yonghe Zhang Jie An David Buckley Alexis Coleiro Bertrand Cordier Liming Dou Rob Eyles-Ferris Zhou Fan Hua Feng Shaoyu Fu Johan P.U.Fynbo Lluis Galbany Saurabh W.Jha Shuaiqing Jiang Albert Kong Erik Kuulkers Weihua Lei Wenxiong Li Bifang Liu Mingjun Liu Xing Liu Yuan Liu zhu Liu Chandreyee Maitra Alessio Marino Itumeleng Monageng Kirpal Nandra Jeremy Sanders Roberto Soria Lian Tao Junfeng Wang Song Wang Tinggui Wang Zhongxiang Wang Qingwen Wu Xuefeng Wu Dong Xu Yanjun Xu Suijian Xue Yongquan Xue Zijian Zhang Zipei zhu Hu Zou Congying Bao Fansheng chen Houlei chen Tianxiang chen Wei chen Yehai chen Yifan chen chenzhou Cui Weiwei Cui Yanfeng Dai Dongwei Fan Ju Guan Dawei Han Dongjie Hou Haibo Hu Maohai Huang Jia Huo Zhenqing Jia Bowen Jiang Ge Jin chengkui Li Junfei Li Longhui Li Maoshun Li Wei Li Zhengda Li Tianying Lian Congzhan Liu Heyang Liu Huaqiu Liu fangjun Lu Laidan Luo Jia Ma Xuan Mao Haiwu Pan Xin Pan Liming Song Hui Sun Yunyin Tan Qingjun Tang Yihan Tao Hao Wang Juan Wang Lei Wang Wenxin Wang Yilong Wang Yusa Wang Qinyu Wu Haitao Xu Jingjing Xu Xinpeng Xu Yunfei Xu Zhao Xu Changbin Xue Yulong Xue Ailiang Yan Haonan Yang Xiongtao Yang Yanji Yang Juan Zhang Mo Zhang Wenjie Zhang Zhen Zhang Zhen Zhang Ziliang Zhang Donghua Zhao Haisheng Zhao Xiaofan Zhao Zijian Zhao Hongyan Zhou Yilin Zhou Yuxuan zhu Zhencai zhu National Astronomical Observatories Chinese Academy of Sciences School of Astronomy and Space Sciences University of Chinese Academy of Sciences Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Institute of Space Sciences (ICE) CSIC Institut d’Estudis Espacials de Catalunya (IEEC) Max Planck Institute for Extraterrestrial Physics Innovation Academy for Microsatellites Chinese Academy of Sciences Department of Physics University of Hong Kong School of Physics and Astronomy University of Leicester School of Physics and Astronomy Sun Yat-sen University Department of Physics Anhui Normal University Shanghai Institute of Technical Physics Chinese Academy of Sciences Physics Department Tsinghua University Nevada Center for Astrophysics University of Nevada Las Vegas Department of Physics and Astronomy University of Nevada Las Vegas South African Astronomical Observatory Department of Astronomy University of Cape Town Department of Physics University of the Free State Université Paris Cité CNRS Astroparticule et Cosmologie Université Paris Cité CEA Paris-Saclay IRFU/DAp-AIM Department of Astronomy Guangzhou University Cosmic Dawn Center (DAWN) Niels Bohr Institute University of Copenhagen Department of Physics and Astronomy Rutgers the State University of New Jersey Institute for Cosmic Ray Research The University of Tokyo ESA/ESTEC Department of Astronomy School of Physics Huazhong University of Science and Technology INAF-Osservatorio Astrofisico di Torino Sydney Institute for Astronomy School of Physics The University of Sydney Department of Astronomy Xiamen University Institute for Frontiers in Astronomy and Astrophysics Beijing Normal University Department of Astronomy University of Science and Technology School of Astronomy and Space Sciences University of Science and Technology of China Institute of Deep Space Sciences Deep Space Exploration Laboratory Department of Astronomy School of Physics and Astronomy Yunnan University Shanghai Astronomical Observatory Chi

We report the discovery of a peculiar X-ray transient,EP240408a,by Einstein Probe （EP） and follow-up studies made with EP,Swift,NICER,GROND,ATCA and other ground-based multiwavelength *** new transient was first detected with Wide-field X-ray Telescope （WXT） on board EP on April 8th,2024,manifested in an intense yet brief X-ray flare lasting for *** flare reached a peak flux of 3.9×10-9erg cm-2s-1in 0.5-4 ke V,～300 times brighter than the underlying X-ray emission detected throughout the *** and more precise follow-up observations by EP/FXT,Swift and NICER confirmed the finding of this new *** X-ray spectrum is non-thermal in 0.5-10 ke V,with a power-law photon index varying *** X-ray light curve shows a plateau lasting for ～4 d,followed by a steep decay till becoming undetectable ～10 d after the initial *** on its temporal property and constraints from previous EP observations,an unusual timescale in the range of 7-23 d is found for EP240408a,which is intermediate between the commonly found fast and long-term *** counterparts have been found in optical and near-infrared,with the earliest observation at 17 h after the initial X-ray detection,suggestive of intrinsically weak emission in these *** demonstrate that the remarkable properties of EP240408a are inconsistent with any of the transient types known so far,by comparison with,in particular,jetted tidal disruption events,gamma-ray bursts,X-ray binaries and fast blue optical *** nature of EP240408a thus remains an *** suggest that EP240408a may represent a new type of transients with intermediate timescales of the order of～10 *** detection and follow-ups of more of such objects are essential for revealing their origin.

关键词： X-ray transients ${\bm~{Einstein~~Probe}}$

Thermodynamic properties of cubic ZrC under high pressure from first-principles calculations

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Science China(Physics,Mechanics & Astronomy) 2009年第7期52卷 1039-1042页

作者： zhu Jun zhu Bo QU JianYing GOU QingQuan chen fang College of Physical Science and Technology Sichuan UniversityChengdu 610065China Southwest Jiaotong University-Emei Campus Emei 614202China

The elastic and thermodynamic properties of Zirconium carbide (ZrC) are investigated by ab initio plane-wave pseudopotential density function theory method. The obtained lattice constant, elastic constant and bulk modulus B are consistent with the experimental and theoretical data. Through the quasi-harmonic Debye model, the dependences of the normalized volume V/V0 and the bulk modulus B on pressure P, as well as the specific heat CV on the temperature T are obtained successfully. The relationships of the thermal expansion α with temperature and pressure are also investigated, which indicate the temperature hardly has any effect on the thermal expansion α at high pressure.

关键词： elastic properties thermodynamic properties ZrC

复方化学消毒剂中西吡氯铵的高效液相色谱测定研究

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中国消毒学杂志 2018年第3期35卷 171-173页

作者：李放陈蓓朱峰张昊刘华良徐燕江苏省疾病预防控制中心南京210009

目的建立测定复方化学消毒剂中西吡氯铵的高效液相色谱方法。方法样品经流动相提取,以甲醇和0.05 mol/L乙酸铵(pH 5.0)为流动相等度洗脱,氰基色谱柱分离,检测波长为259 nm,外标法定量。结果在2.5~100.0 mg/L范围内线性关系良好(r=0.999 ... 详细信息

目的建立测定复方化学消毒剂中西吡氯铵的高效液相色谱方法。方法样品经流动相提取,以甲醇和0.05 mol/L乙酸铵(pH 5.0)为流动相等度洗脱,氰基色谱柱分离,检测波长为259 nm,外标法定量。结果在2.5~100.0 mg/L范围内线性关系良好(r=0.999 9),两种不同基质中分别添加10、30和60 mg/L,回收率范围90.3%~107.2%,相对标准偏差均<5%,方法检出限为1.0 mg/L,定量限为2.5 mg/L。结论该方法简单、快速、准确,适合于复方化学消毒剂中西吡氯铵的定量分析。

关键词：西吡氯铵高效液相色谱法消毒剂季铵盐阳离子表面活性剂

围岩变形模量对调压井衬砌结构内力及配筋的影响

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水电站设计 2005年第1期21卷 10-13页

作者：陈方竹何江达许有飞段斌四川大学水利水电学院四川成都610065

采用三维非线性有限元法分析了复杂地质条件下的姜射坝阻抗式调压井结构特性。给出了基于有限元计算应力进行配筋的计算原理和计算方法,研究了围岩变形模量以及横撑断面尺寸变化对调压井结构特性和配筋量的影响。

关键词：调压井阻抗式三维非线性有限元衬砌结构围岩变形断面配筋量内力模量复杂地质条件

一株虹鳟源维氏气单胞菌的分离鉴定及组织病理学观察

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中国预防兽医学报 2016年第11期38卷 879-883页

作者：王兴丽汪开毓陈德芳朱劼垚杨倩贺扬王二龙四川农业大学动物医学学院四川成都611130 四川农业大学动物科技学院四川成都611130

为鉴定一起虹鳟突发疾病死亡的病原，本研究从自然发病虹鳟的内脏分离到一株致病菌WX153415，并对其进行了常规理化特性、分子生物学、人工感染试验和病理学观察以及药敏性检测。结果显示：分离株WX153415为革兰氏阴性短杆菌，其理化特... 详细信息

为鉴定一起虹鳟突发疾病死亡的病原，本研究从自然发病虹鳟的内脏分离到一株致病菌WX153415，并对其进行了常规理化特性、分子生物学、人工感染试验和病理学观察以及药敏性检测。结果显示：分离株WX153415为革兰氏阴性短杆菌，其理化特性与维氏气单胞菌（***）特征相符，并且其16SrDNA基因、gyrB基因、毒力基因act、毒力基因aer和毒力基因aha序列与GenBank中***的同源性均可达98％以上，在系统进化树中与***聚为一族；动物回归试验结果表明，分离株LD50为1．5×10^6cfu／mL；病理学观察显示该分离株主要损伤虹鳟的鳃、肝和肾等重要器官组织，综合检测结果表明该分离株为致病性***。药敏试验结果显示，分离株对14种抗菌药物中头孢哌酮、哌拉西林、氟苯尼考和头孢呋辛药物敏感。

关键词：维氏气单胞菌虹鳟分离鉴定病理学观察