检索结果-南通市图书馆

frontiers of Chemical science and Engineering 2024年第6期18卷 31-40页

作者： Shanxin xiong fengyan lv Chenxu Wang Nana yang yukun zhang Qingyong Duan Shuaishuai Bai Xiaoqin Wang Zhen li jianwei Xu college of chemistry and Chemical Engineering Xi’an University of Science and TechnologyXi’an 710054China Key laboratory of Coal Resources Exploration and Comprehensive Utilization Ministry of Land and ResourcesXi’an 710021China Institute of Sustainability for Chemicals Energy and EnvironmentJurong Island 627833Singapore

The scalable production of high grade activated carbon from abundant coal for supercapacitors application is an efficient way to achieve high value-added utilization of coal ***,this technology is challenging due to lack of comprehensive understanding on the mechanism of activation process and effect of external *** this paper,the effect of activating temperature and time on the specific capacitance of coal-based activated carbon prepared by h2O steam activation was studied using the response surface *** optimal conditions,coal-based activated carbon exhibits the largest specific capacitance of 194.35 f·g^(−1),thanks to the appropriate pore/surface structure and defect *** functional theory calculations explain in detail the mechanism of contraction of aromatic rings and overflow of h2 and CO during the ***,oxygen-containing functional groups are introduced,contributing to the pseudocapacitance property of coal-based activated *** mechanism of reactions between aromatic carbon and h2O vapor provides understanding on the role of water during coal processing at the molecular level,offering great potential to regulate product distribution and predict rate of pore *** insight would contribute to the advancement of other coal processing technology such as gasification.

关键词： response surface optimization coal-based activated carbon supercapacitor activating mechanism

Catalytic performance of zirconium modified Co/Al2O3 for fischer-Tropsch synthesis

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Catalytic performance of zirconium modified Co/Al2O3 for Fis...

Catalytic properties of Ru nanoparticles embedded on ordered mesoporous carbon with different pore size in fischer-Tropsch synthesis

湖北省化学化工学会2006年年会暨循环经济专家论坛

作者： haifeng xiong, yuhua zhang, Kongyong liew, jinlin li hubei Key laboratory for Catalysis and Material science, college of chemistry and life science, south-central university for nationalities, wuhan 430074, china

a series of zirconium modified Co/Al2O3 catalysts were prepared with a two-step impregnation method using the incipient wetness technique. XRD, XPS, TPR, h2-TPD and oxygen titration were used for the characterization of the catalysts. The catalytic performance was performed in a fixed bed reactor for fischer-Tropsch synthesis (fTS). The CoAl2O4 spinel phase was detected on the prepared catalysts and its content on the catalysts decreased with the increase of zirconium loading, indicating that Zr-added could inhibit CoAl2O4 formation. The addition of zirconium to the Co catalyst caused the increase of cobalt cluster size. Zr addition has been shown to improve the activity and C5+ selectivity of Co/Al2O3 catalyst for fischer-Tropsch synthesis. This could be explained by the increase of active metal cobalt site and reducibility. The increase of zirconium loading on Co/Zr/Al2O3 catalyst resulted in the increase of olefin/paraffin ratio in the products.

关键词： fischer-Tropsch synthesis Cobalt/alumina Zirconium Reducibility Olefin/paraffin

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

journal of Energy chemistry 2013年第4期22卷 560-566页

作者： Kun xiong yuhua zhang jinlin li Kongyong liew Key laboratory of Catalysis and Materials science of the State Ethnic Af fairs Commission & Ministry of Education South-Central University for Nationalities college of chemistry and Chemical Engineering Chongqing University college of chemistry Chemical Engineering and Materials ScienceSoochow University faculty of Industrial science and Technology Universiti Malaysia Pahang

A series of 3 wt% Ru embedded on ordered mesoporous carbon （OMC） catalysts with different pore sizes were prepared by autoreduction between ruthenium precursors and carbon sources at 1123 K. Ru nanoparticles were embedded on the carbon walls of OMC. Characterization technologies including power X-ray diffraction （XRD）, nitrogen adsorption-desorption, transmission electron microscopy （TEM）, and hydrogen temperature-programmed reduction （h2-TPR） were used to scrutinize the catalysts. The catalyst activity for fischer-Tropsch synthesis （fTS） was measured in a fixed bed reactor. It was revealed that 3 wt% Ru-OMC catalysts exhibited highly ordered mesoporous structure and large surface area. Compared with the catalysts with smaller pores, the catalysts with larger pores were inclined to form larger Ru particles. These 3 wt% Ru-OMC catalysts with different pore sizes were more stable than 3 wt% Ru/AC catalyst during the fTS reactions because Ru particles were embedded on the carbon walls, suppressing particles aggregation, movement and oxidation. The catalytic activity and C5＋ selectivity were found to increase with the increasing pore size, however, Ch4 selectivity showed the opposite trend. These changes may be explained in terms of the special environment of the active Ru sites and the diffusion of products in the pores of the catalysts, suggesting that the activity and hydrocarbon selectivity are more dependent on the pore size of OMC than on the Ru particle size.

关键词： fischer-Tropsch synthesis ordered mesoporous carbon Ru nanoparticle size pore size embedded

Synthesis and structure-insecticidal activity relationship of novel phenylpyrazole carboxylic acid derivatives containing fluorine moiety

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical letters 2020年第3期31卷 739-745页

作者： Baolei Wang hongxue Wang hang liu lixia xiong Na yang yan zhang Zhengming li State Key laboratory of Elemento-Organic chemistry College of ChemistryNankai UniversityTianjin 300071China

A series of novel phenylpyrazole carboxylic acid derivatives containing fluorine moiety,i.e.,diamides 11,simple aryl-bearing amides 12 and acylthioureas 14 were successfully synthesized based on the key fluo ro-containing phe nylpyrazole acid *** new compounds were identified and confirmed by melting point,1h NMR,13C NMR and elemental analysis or *** bioassay results indicated that some of the compounds possessed excellent insecticidal activities towards oriental armyworm,diamondback moth and corn borer at low *** examples,compounds 11a,11e-g and 14b exhibited remarkable larvicidal activities with lC50 values of 0.13-0.39 mg/l and 0.0002-0.0014 mg/l against oriental armyworm and diamondback moth,respectively,were comparable with those of the control ***,lie were found superior to chlorantraniliprole in oriental armyworm tests(lC50:0.23 mg/l vs.0.26 mg/l);11a,lie,11f and 14c in diamondback moth tests with lC50 values of 0.0002 mg/l,0.0002 mg/l,0.0008 mg/l and 0.0005 mg/l,respectively,we re more effective than that of *** addition,12 a also showed a promising insecticidal potential and development/optimization *** 11a,lle-g,12a,14b and 14c could be considered as possible new leading structures for further *** SAR investigation indicated that the compounds with fluorine motif(e.g.,-f,-Cf2h,-Cf3)held apparently favorable insecticidal potentials,which provided useful guidance for further design/development of new phenylpyrazole-containing agrochemicals.

关键词： Phenylpyrazole carboxylic acid derivatives fluorochemicals Synthesis Insecticidal activity Structure-activity relationship

Anion-immobilized solid composite electrolytes based on metal-organic frameworks and superacid ZrO_(2) fillers for high-performance all solid-state lithium metal batteries

在线全文

学校读者我要写书评

暂无评论

International journal of Minerals,Metallurgy and Materials 2021年第10期28卷 1636-1646页

作者： Tao Wei Zao-hong zhang Qi zhang jia-hao lu Qi-ming xiong feng-yue Wang Xin-ping Zhou Wen-jia Zhao Xiang-yun Qiu School of Energy and Power Jiangsu University of Science and TechnologyZhenjiang 212003China Institute of Mechanics and Energy National Research Ogarev Mordovia State UniversitySaransk 430000Russia jiangsu university jingjiang college Zhenjiang 212003China Department of chemistry College of ScienceNanjing Agricultural UniversityNanjing 210095China Power&Energy Storage System Research Center College of Mechanical and Electrical EngineeringQingdao UniversityQingdao 266071China

Anion-immobilized solid composite electrolytes(SCEs)are important to restrain the propagation of lithium dendrites for all solid-state lithium metal batteries(ASSlMBs).herein,a novel SCEs based on metal-organic frameworks(MOfs,UiO-66-Nh_(2))and superacid ZrO_(2)(S-ZrO_(2))fillers are proposed,and the samples were characterized by X-ray diffraction(XRD),scanning electron microscope(SEM),energy dispersive X-ray spectroscopy(EDS),thermo-gravimetric analyzer(TGA)and some other electrochemical ***-Nh_(2) groups of UiO-66-Nh_(2) combines with f atoms of poly(vinylidene fluoride-co-hexafluoropropylene)(PVDf-hfP)chains by hydrogen bonds,leading to a high electrochemical stability window of 5 *** to the incorporation of UiO-66-Nh_(2) and S-ZrO_(2) in PVDf-hfP polymer,the open metal sites of MOfs and acid surfaces of S-ZrO_(2) can immobilize anions by strong lewis acid-base interaction,which enhances the effect of immobilization anions,achieving a high li-ion transference number(t_(+))of 0.72,and acquiring a high ionic conductivity of 1.05×10^(-4) S·cm^(-1) at 60℃.The symmetrical li/li cells with the anion-immobilized SCEs may steadily operate for over 600 h at 0.05 mA·cm^(-2) without the shortcircuit ***,the solid composite li/lifePO_(4)(lfP)cell with the anion-immobilized SCEs shows a superior discharge specific capacity of 158 mAh·g^(-1) at 0.2 *** results illustrate that the anion-immobilized SCEs are one of the most promising choices to optimize the performances of ASSlMBs.

关键词： solid composite electrolytes poly(vinylidene fluoride-co-hexafluoropropylene)(PVDf-hfP) all solid-state lithium metal batteries metal-organic frameworks anion-immobilized

Thermal-induced reversible ferroelastic phase transition in a new bromethyl-substituted molecular rotor

在线全文

学校读者我要写书评

暂无评论

science china chemistry 2015年第7期58卷 1137-1143页

作者： Bao-ying Wang Chun-Ting he Bo huang Wei-jian Xu Wei Xue Zi-yi Du Wei-xiong zhang Xiao-Ming Chen Key laboratory of Bioinorganic and Synthetic chemistry Ministry of Education School of chemistry & Chemical Engineering Sun Yat-Sen University college of chemistry & Chemical Engineering Gannan Normal University

A new bromethyl-substituted molecular rotor, [Cu（dabcoCh2Br）（h2O）Br3] （dabcoCh2Br＋=1-（2-bromethyl）-1,4-diazoniabi- cyclo[2.2.2]octane cation）, which belongs to a family of balomethyl-substituted molecular rotors, was synthesized and struc- turally characterized. The reversible phase transition at ca. 250 K was well established for this molecular rotor by thermal analyses, variable-temperature X-ray diffraction, and variable temperature dielectric measurements. The order-disorder trans- formation of the rotator part （dabco moiety） causes ferroelastic phase transition with an Aizu notation of mmmf2/m from high- temperature orthorhombic phase （Pbnm） to low-temperature monoclinic phase （P21/n）. More important, in reference to the density functional theory calculations and structural analyses, the key factors to tune the phase transition behaviors were dis- cussed in detail for this family of halomethyl-substituted molecular rotors.

关键词： ferroelastic phase transition molecular rotor confined space

Dimesitylborylphenyl substituted 1,3,4-oxadiazole:Synthesis,characterization and sensitivity to f^-

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical letters 2011年第5期22卷 599-602页

作者： Xiang hong li Bo Xu, Kang le lv Ai Qing zhang college of chemistry and Materials South-Central University for Nationalities Wuhan 430074 China

A new 1,3,4-oxadiazole compound with a dimesitylboryl group was synthesized and characterized by ~1h NMR,MS,element analysis and X-ray single-crystal *** exhibits good blue emission at 425 nm and high sensitivity to f... 详细信息

关键词： 1 3.4-Oxadiazole Dimesitylboryl fluoride anion Chemo-sensor

Rare-Earth Metal Boroxide with formal Triple Metal-Oxygen Orbital Interaction:Synthesis from B(C_(6)f_(5))_(3)·h_(2)O and Radical-Anion ligated Rare-Earth Metal Amides

在线全文

学校读者我要写书评

暂无评论

CCS chemistry 2021年第11期3卷 2772-2781页

作者： haihan yan Botao Wu Xiao-Kun Zhao Chao yu junnian Wei han-Shi hu Wen-xiong zhang Zhenfeng Xi Beijing National laboratory for Molecular sciences MOE Key Laboratory of Bioorganic Chemistry and Molecular EngineeringCollege of ChemistryPeking UniversityBeijing 100871 Department of chemistry Key Laboratory of Organic Optoelectronics and Molecular Engineering of Ministry of EducationTsinghua UniversityBeijing 100084

Rare-earth metal boroxides are not only rare and of great synthetic challenge but also important theoretically due to their unrevealed bonding *** this paper,we report the synthesis,characterization,and bonding characteristics of the 4f-block metal boroxide complexes ^(Mes)DAD_(2)luOB(C_(6)f_(5))X(4-lu,X=C_(6)f_(5);5-lu,X=NC_(13)h_(10))with two chelating radical-anionic 1,4-diazabutadiene(DAD)*** synthesis of 4-lu or 5-lu involved three steps,during which the radical-anionic DAD ligands could be kept stable:(1)the reaction of luCl_(3),^(Mes)DAD,and potassium graphite(KC8)afforded the diradical rare-earth metal chloride ^(Mes)DAD_(2)luCl·tetrahydrofuran(Thf)(1-lu);(2)the salt metathesis of 1-lu with two alkali metal amides gave lutetium bis(diazabutadiene)amides 2-lu or 3-lu,respectively;and(3)2-lu or 3-lu reacted with B(C_(6)f_(5))_(3)·h_(2)O,resulting in the formation of rare-earth metal boroxides 4-lu or *** radical-anionic nature of DAD ligands in these complexes were proven by their bond lengths and coordination modes in single-crystal *** calculations clearly show the bonding of 4-lu can be divided into three major types of lu-O orbital interactions,which can be categorized asσ-donation,π-donation,and d-π-*** triple lu-O orbital interactions cooperatively make a lu-O single bond and contribute to the linear lu-O-B structure.

关键词： rare-earth metals boroxide radical-anion ligands orbital interaction

The enhanced X-ray Timing and Polarimetry mission—eXTP

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

science china(Physics,Mechanics & Astronomy) 2019年第2期62卷 3-27页

作者： ShuangNan zhang Andrea Santangelo Marco feroci yuPeng Xu fangjun lu yong Chen hua feng Shu zhang Sφren Brandt Margarita hernanz luca Baldini Enrico Bozzo Riccardo Campana Alessandra De Rosa yongWei Dong yuri Evangelista Vladimir Karas Norbert Meidinger Aline Meuris Kirpal Nandra Teng Pan Giovanni Pareschi Piotr Orleanski QiuShi huang Stephane Schanne Giorgia Sironi Daniele Spiga jiri Svoboda Gianpiero Tagliaferri Christoph Tenzer Andrea Vacchi Silvia Zane Dave Walton ZhanShan Wang Berend Winter Xin Wu jean j.M.in't Zand Mahdi Ahangarianabhari Giovanni Ambrosi filippo Ambrosino Marco Barbera Stefano Basso jörg Bayer Ronaldo Bellazzini Pierluigi Bellutti Bruna Bertucci Giuseppe Bertuccio Giacomo Borghi Xuelei Cao franck Cadoux francesco Ceraudo TianXiang Chen yu Peng Chen jerome Chevenez Marta Civitani Wei Cui WeiWei Cui Thomas Dauser Ettore Del Monte Sergio Di Cosimo Sebastian Diebold Victor Doroshenko Michal Dovciak yuanyuan Du lorenzo Ducci QingMei fan yannick favre fabio fuschino joséluis Ga'lvez Min Gao Mingyu Ge Olivier Gevin Marco Grassi Quanying Gu yuDong Gu DaWei han Bin hong Wei hu long ji ShuMei jia WeiChun jiang Thomas Kennedy Ingo Kreykenbohm Irfan Kuvvetli Claudio labanti luca latronico Gang li MaoShun li Xian li Wei li ZhengWei li Olivier limousin hongWei liu Xiaojing liu Bo lu Tao luo Daniele Macera Piero Malcovati Adrian Martindale Malgorzata Michalska Bin Meng Massimo Minuti Alfredo Morbidini fabio Muleri Stephane Paltani Emanuele Perinati Antonino Picciotto Claudio Piemonte jinlu Qu Alexandre Rachevski Irina Rashevskaya jerome Rodriguez Thomas Schanz ZhengXiang Shen liZhi Sheng jiangBo Song liMing Song Carmelo Sgro liang Sun ying Tan Phil Uttley Bo Wang Dianlong Wang Guofeng Wang juan Wang langPing Wang yuSa Wang Anna l.Watts Xiangyang Wen jörn Wilms Shaolin xiong jiaWei yang Sheng yang yanji yang Nian yu WenDa zhang Gianluigi Zampa Nicola Zampa Andrzej A.Zdziarski AiMei zhang ChengMo zhang fan zhang long zhang Tong zhang yi zhang Xiaoli zhang Ziliang zhang BaoSheng Zhao Shijie Zheng yu Peng Zhou Key laboratory for Particle Astrophysics Institute of High Energy PhysicsChinese Academy of Sciences Institut für Astronomie und Astrophysik Eberhard Karls Universität INAf-Istituto di Astrofisica e Planetologia Spaziali INfN-Roma Tor Vergata Via della Ricerca Scientifica 1 Department of Engineering Physics and Center for Astrophysics Tsinghua University DTU Building 327DK-2800 Kongens Institute of Space sciences 08193 Cerdanyola del Valles Institut d’Estudis Espacials de Catalunya Sezione di Pisa Istituto Nazionale di Fisica NucleareLargo Bruno Pontecorvo3 Department of Astronomy University of Genevachemin d’Ecogia 16 Osservatorio di Astrofisica e Scienza Dello Spazio di Bologna Istituto Nazionale di Astofisica Astronomical Institute Czech Academy of Sciences Max Planck Institute for Extraterrestrial Physics Giessenbachstr.1 CEA Paris-Saclay/IRfU Beijing Institute of Spacecraft System Engineering CAST Osservatorio Astronomico di Brera Istituto Nazionale di Astofisica Space Research Center Polish Academy of Sciences Key laboratory of Advanced Material Microstructure of Education Ministry of china Institute of Precision Optical EngineeringSchool of Physics Science and EngineeringTongji University Department of Physics and Center for Astrophysics Tsinghua University Universita’degli Studi di Udine Via delle Scienze 206 Mullard Space science laboratory University College London Department of Nuclear and Particle Physics University of Geneva SRON Netherlands Institute for Space Research Politecnico di Milano Sezione di Perugia Istituto Nazionale di Fisica Nucleare Dipartimento di fisica e Chimica fondazione Bruno Kessler Dr.Karl Remeis-Observatory and Erlangen Centre for Astroparticle Physics Universität Erlangen-Nürnberg university of Pavia Department of ElectronicsInformation and Biomedical Engineering and INFN Pavia Sezione di Torino Istituto Nazionale di Fisica NucleareVia Pietro Giuria1 Department of Physics and Astronomy University of Leicester Sezione di Trieste Istituto Nazionale di Fisica Nucleare

In this paper we present the enhanced X-ray Timing and Polarimetry mission—eXTP. eXTP is a space science mission designed to study fundamental physics under extreme conditions of density, gravity and magnetism. The mission aims at determining the equation of state of matter at supra-nuclear density, measuring effects of QED, and understanding the dynamics of matter in strong-field gravity. In addition to investigating fundamental physics, eXTP will be a very powerful observatory for astrophysics that will provide observations of unprecedented quality on a variety of galactic and extragalactic objects. In particular, its wide field monitoring capabilities will be highly instrumental to detect the electro-magnetic counterparts of gravitational wave *** paper provides a detailed description of:(1) the technological and technical aspects, and the expected performance of the instruments of the scientific payload;(2) the elements and functions of the mission, from the spacecraft to the ground segment.

关键词： X-ray instrumentation X-ray polarimetry X-ray timing space mission:eXTP