检索结果-南通市图书馆

Insights into carbon-based materials for catalytic dehydrogenation of low-carbon alkanes and ethylbenzene

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2023年第11期17卷 1623-1648页

作者： Sijia Xing Sixiang Zhai Lei Chen huabin yang Zhong-Yong Yuan School of Materials Science and Engineering Smart Sensing Interdisciplinary Science CenterNankai UniversityTianjin 300350China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin 300071China

Direct dehydrogenation with high selectivity and oxidative dehydrogenation with low thermal limit has been regarded as promising methods to solve the increasing demands of light olefins and *** catalysts have shown remarkable performance for these reactions,such as Pt,CrOx,Co,ZrOx,Zn and *** with metal-based catalysts,carbon materials with stable structure,rich pore texture and large surface area,are ideal platforms as the catalysts and the supports for dehydrogenation *** this review,carbon materials applied in direct dehydrogenation and oxidative dehydrogenation reactions including ordered mesoporous carbon,carbon nanodiamond,carbon nanotubes,graphene and activated carbon,are summarized.A general introduction to the dehydrogenation mechanism and active sites of carbon catalysts is briefly presented to provide a deep understanding of the carbon-based materials used in dehydrogenation *** unique structure of each carbon material is presented,and the diversified synthesis methods of carbon catalysts are *** approaches for promoting the catalytic activity of carbon catalysts are elaborated with respect to preparation method optimization,suitable structure design and heteroatom *** regeneration mechanism of carbon-based catalysts is discussed for providing guidance on catalytic performance *** addition,carbon materials as the support of metal-based catalysts contribute to exploiting the excellent catalytic performance of catalysts due to superior structural *** the end,the challenges in current research and strategies for future improvements are proposed.

关键词： carbon materials dehydrogenation active sites mechanism catalytic performance support

B_(2)O_(3)掺杂对0.76BF-0.24BT高温无铅压电陶瓷结构与性能影响

在线全文

学校读者我要写书评

暂无评论

桂林电子科技大学学报 2024年第3期44卷 286-291页

作者：黄蔚然杨华斌袁琳娜桂林电子科技大学材料科学与工程学院广西桂林541004 桂林电子科技大学电子信息材料与器件教育部工程研究中心广西桂林541004

为研究掺杂B_(2)O_(3)对陶瓷的影响,采用固相合成法制备了0.76BiFeO_(3)-0.24BaTiO_(3)-xB_(2)O_(3)(简称0.76BF-0.24BT-x BO)高温无铅压电陶瓷,x为摩尔分数。对0.76BF-0.24BT-x BO陶瓷相结构、微观形貌组织、电学性能、居里温度以及退极化温度进行测试分析。XRD分析表明所有样品均为纯三方钙钛矿结构。观察陶瓷微观形貌,发现晶粒分布均匀,晶界之间有液相存在,且晶粒尺寸随着x增加而增大。陶瓷最佳烧结温度从960℃降至940℃。当x=0.1时,压电常数和剩余极化强度达到最大值,分别为101 pC·N^(-1)、21.5μC·cm^(-2)。0.76BF-0.24BT-x BO陶瓷有着良好的高温稳定性:居里温度T_(C)为585℃,退极化温度T_(d)=560℃。研究结果表明,掺杂B_(2)O_(3)具有改善0.76BF-0.24BT陶瓷微观形貌组织、降低烧结温度和提高电学性能的作用。

关键词：铁酸铋-钛酸钡无铅压电陶瓷居里温度退极化温度压电性能低温烧结

Boosting kinetic separation of ethylene and ethane on microporous materials via crystal size control

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2024年第1期65卷 85-91页

作者： Yixuan Ma Cong Yu Lifeng yang Rimin You Yawen Bo Qihan Gong huabin Xing Xili Cui Key Laboratory of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310012China Fundamental Science&Advanced Technology Lab PetroChina Petrochemical Research InstituteChina National Petroleum CorporationBeijing 102200China ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang UniversityHangzhou 311200China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Hangzhou 310027China

The adsorptive separation of C_(2)H_(4)and C_(2)H_(6),as an alternative to distillation units consuming high energy,is a promising yet challenging *** great similarity in the molecular size of C_(2)H_(4)and C_(2)H_(6)brings challenges to the regulation of adsorbents to realize efficient dynamic ***,we reported the enhancement of the kinetic separation of C_(2)H_(4)/C_(2)H_(6)by controlling the crystal size of ZnAtzPO_(4)(Atz=3-amino-1,2,4-triazole)to amplify the diffusion difference of C_(2)H_(4)and C_(2)H_(6).Through adjusting the synthesis temperature,reactant concentration,and ligands/metal ions molar ratio,ZnAtzPO4 crystals with different sizes were *** single-component kinetic adsorption tests and binary-component dynamic breakthrough experiments confirmed the enhancement of the dynamic separation of C_(2)H_(4)/C_(2)H_(6)with the increase in the crystal size of ZnAtzPO_(4).The separation selectivity of C_(2)H_(4)/C_(2)H_(6)increased from 1.3 to 98.5 with the increase in the crystal size of ZnAtzPO_(4).This work demonstrated the role of morphology and size control of adsorbent crystals in the improvement of the C_(2)H_(4)/C_(2)H_(6)kinetic separation performance.

关键词： Adsorption Adsorbent Ethylene Binary mixture Crystal size control Kinetic separation

The character of Thurston's circle packings

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2024年第7期67卷 1623-1640页

作者： huabin Ge Aijin Lin School of Mathematics Renmin University of ChinaBeijing100872China Department of Mathematics National University of Defense TechnologyChangsha410073China

We introduce the character of Thurston's circle packings in the hyperbolic background ***, some quite simple criteria are obtained for the existence of hyperbolic circle packings. For example,if a closed surface X admits a circle packing with all the vertex degrees d_(i)≥7, then it admits a unique complete hyperbolic metric so that the triangulation graph of the circle packing is isotopic to a geometric decomposition of X. This criterion is sharp due to the fact that any closed hyperbolic surface admits no triangulations with all d_(i)≤6. As a corollary, we obtain a new proof of the uniformization theorem for closed surfaces with genus g≥2;moreover, any hyperbolic closed surface has a geometric decomposition. To obtain our results, we use Chow-Luo's combinatorial Ricci flow as a fundamental tool.

关键词： character circle packings combinatorial Ricci flow

Strategies to achieve effective nitrogen activation

在线全文

学校读者我要写书评

暂无评论

Carbon Energy 2024年第5期6卷 137-163页

作者： Bin Chang huabin Zhang Shuhui Sun Gaixia Zhang KAUST Catalysis Center(KCC) King Abdullah University of Science and Technology(KAUST)ThuwalKingdom of Saudi Arabia Institut National de la Recherche Scientifique(INRS) CentreÉnergie Matériaux TélécommunicationsVarennesQuébecCanada Department of Electrical Engineering École de Technologie Supérieure(ÉTS)MontréalQuébecCanada

Ammonia serves as a crucial chemical raw material and hydrogen energy *** electrocatalytic nitrogen reduction reaction(NRR),powered by renewable energy,has attracted tremendous interest during the past few *** some achievements have been revealed in aqueous NRR,significant challenges have also been *** activity and selectivity are fundamentally limited by nitrogen activation and competitive hydrogen *** review focuses on the hurdles of nitrogen activation and delves into complementary strategies,including materials design and system optimization(reactor,electrolyte,and mediator).Then,it introduces advanced interdisciplinary technologies that have recently emerged for nitrogen activation using high-energy physics such as plasma and *** a better understanding of the corresponding reaction mechanisms in the coming years,these technologies have the potential to be extended in further *** review provides further insight into the reaction mechanisms of selectivity and stability of different reaction *** then recommend a rigorous and detailed protocol for investigating NRR performance and also highlight several potential research directions in this exciting field,coupling with advanced interdisciplinary applications,in situ/operando characterizations,and theoretical calculations.

关键词： activation via mediators catalyst optimization electrochemical nitrogen fixation high-energy activation of nitrogen nitrogen

Fine structure ofαdecay in^(222)Pa

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

Chinese Physics C 2021年第4期45卷 192-197页

作者： Wei Hua Zhiyuan Zhang Long Ma Zaiguo Gan huabin yang Cenxi Yuan Minghui Huang Chunli yang Mingming Zhang Yulin Tian Xiaohong Zhou Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China CAS Key Laboratory of High Precision Nuclear Spectroscopy Institute of Modern PhysicsChinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBejing 100049China

With the help of the gas-filled recoil spectrometer SHANS and a digital data acquisition system,the fine structure of the α decay for^(222)Pa was *** nuclides were produced through the 1p3n evaporation channel via the heavy-ion induced fusion evaporation reaction ^(40)Ar+^(186)*** on the ER-α1-α2-α3 andα-γcorrelation measurement,three new α decays were observed in addition to the three branches known *** one with the largestαdecay energy was regarded as the ground state to ground state *** newly measuredαdecay properties of ^(222)Pa were examined in a framework of reduced width.

关键词： fusion-evaporation reaction αdecay fine structure Q_(α)reduced width

α-decay study of ^(218)Ac and ^(221)Th in ^(40)Ar+^(186)W reaction

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2021年第4期45卷 242-247页

作者： Wei Hua Zhiyuan Zhang Long Ma Zaiguo Gan huabin yang Minghui Huang Chunli yang Mingming Zhang Yulin Tian Xiaohong Zhou Cenx Yuan Caiwan Shen Long Zhu Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China CAS Key Laboratory of High Precision Nuclear Spectroscopy Institute of Modern PhysicsChinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeiing 100049China School of Science Huzhou UniversityHuzhou 313000China

In this study,^(218)Ac and ^(221)Th nuclides were produced via the heavy-ion induced fusion evaporation reaction ^(40)Ar+^(186)*** decay properties were studied with the help of the gas-filled recoil spectrometer SHANS and a digital data acquisition *** cross section ratio between ^(222)Pa and ^(218)Ac was extracted experimentally,withmeasured value 0.69(9).Two new possible α decay branches to ^(221)Th are *** valence neutron configurations for the daughter ^(217)Ra are discussed in terms of the hindrance factors.

关键词： fusion-evaporation reaction αdecay fine structure reduced width hindrance factor

2 - 5 New Isotope 205Ac

在线全文

学校读者我要写书评

暂无评论

IMP & HIRFL Annual Report 2013年第1期 40-41页

作者： yang huabin Gan Zaiguo Zhang Zhiyuan Ma Long Yu Lin

Enabling heterogeneous catalysis to achieve carbon neutrality: Directional catalytic conversion of CO_(2) into carboxylic acids

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

Carbon Energy 2024年第3期6卷 1-35页

作者： Xiaofei Zhang Wenhuan Huang Le Yu Max García-Melchor Dingsheng Wang Linjie Zhi huabin Zhang KAUST Catalysis Center(KCC) King Abdullah University of Science and Technology(KAUST)ThuwalSaudi Arabia Key Laboratory of Chemical Additives for China National Light Industry College of Chemistry and Chemical EngineeringShaanxi University of Science and TechnologyXi'anChina State Key Lab of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijingChina School of Chemistry CRANN and AMBERResearch CentresTrinity College DublinCollege GreenDublinIreland Department of Chemistry Tsinghua UniversityBeijingChina Advanced Chemical Engineering and Energy Materials Research Center China University of Petroleum(East China)QingdaoChina

The increase in anthropogenic carbon dioxide(CO_(2))emissions has exacerbated the deterioration of the global environment,which should be controlled to achieve carbon *** to the core goal of achieving carbon neutrality is the utilization of CO_(2) under economic and sustainable ***,the strong need for carbon neutrality has led to a proliferation of studies on the direct conversion of CO_(2) into carboxylic acids,which can effectively alleviate CO_(2) emissions and create high-value *** purpose of this review is to present the application prospects of carboxylic acids and the basic principles of CO_(2) conversion into carboxylic acids through photo-,electric-,and thermal *** attention is focused on the regulation strategy of the activity of abundant catalysts at the molecular level,inspiring the preparation of high-performance *** addition,theoretical calculations,advanced technologies,and numerous typical examples are introduced to elaborate on the corresponding process and influencing factors of catalytic ***,challenges and prospects are provided for the future development of this *** is hoped that this review will contribute to a deeper understanding of the conversion of CO_(2) into carboxylic acids and inspire more innovative breakthroughs.

关键词： carbon neutrality carboxylic acids CO_(2)conversion heterogeneous catalyst in situ technology