检索结果-南通市图书馆

Green carbon science:fundamental aspects

在线全文

学校读者我要写书评

暂无评论

National Science Review 2023年第9期10卷 21-36页

作者： Mingyuan He Kun Zhang Yejun Guan Yuhan Sun Buxing Han Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular Engineering East China Normal University Research Institute of Petrochem Processing SINOPEC 3. Institute of Eco-Chongming 4. Low Carbon Energy Conversion CenterShanghai Advanced Research InstituteChinese Academy of Sciences 5. Shanghai Low Carbon Technology Innovation Platform Beijing National Laboratory for Molecular Sciences Institute of ChemistryChinese Academy of Sciences

Carbon energy has contributed to the creation of human civilization,and it can be considered that the configuration of the carbon energy system is one of the important laws that govern the operation of everything in the universe.The core of the carbon energy system is the opposition and unity of two aspects:oxidation and reduction.The operation of oxidation and reduction is based on the ternary elemental system composed of the three elements of carbon,hydrogen and oxygen.Its operation produces numerous reactions and reaction products.Ancient Chinese philosophy helps us to understand in depth the essence of green carbon science,to explore its scientific basis,and to identify the related platforms for technology development.

关键词： green carbon science carbon cycle carbon energy carbon neutrality redox chemistry

Relations of Uranium Enrichment and Metal Sulfides within the Shuanglong Uranium Deposit,Southern Ordos Basin

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Earth Science 2022年第2期33卷 395-408页

作者： Yuhan Sun Yangquan Jiao LiqunWu Hui Rong Key Laboratory of Tectonics and Petroleum Resources China University of GeosciencesMinistry of EducationWuhan 430074China School of Earth Resources China University of GeosciencesWuhan 430074China

Large quantities of metal sulfides are widely distributed in uranium ores from the Middle Jurassic Zhiluo Formation of the Shuanglong uranium deposit,southern Ordos Basin,providing a convenient condition to study the relationship between metal sulfides and uranium minerals.The morphology and composition of uranium minerals and metal sulfides are illustrated to study uranium mineralization and mechanisms of metallogenesis.Uranium minerals can be broadly categorized as pitchblende,coffinite and brannerite.Metal sulfides associated with uranium minerals are pyrite,sphalerite,chalcopyrite and galena.Some assemblages of various metal sulfides and uranium minerals indicate that they are coeval,but the order of formation is different.Based on mineralogical observations,paragenetic sequences for mineral assemblages are discussed.Alteration of Fe-Ti oxides forms Ti oxides,brannerite and pyrite.The formation of chalcopyrite was later than that of pyrite.Clausthalite(Pb Se)replaces sphalerite or shows isomorphism with galena.There are three genetic types of galena,of which typeⅠis related to tectonic thermal events and can interact with uranyl ions to form uranium oxides and Pb;.When sulfur activity is relatively high,Pb;can form new anhedral galena,that is,typeⅡ.TypeⅢof galena is related to the decay of uranium minerals.The genetic order of the main minerals was determined as follows:Fe-Ti oxides>Ti oxides/sphalerite/pyrite>clausthalite/galenaⅠ/chalcopyrite>galenaⅡ/uranium minerals>galenaⅢduring the diagenetic stage.Hydrogen sulfide(H;S)is a decisive factor in the interaction between metal sulfides and uranium.Metal ions can react with H;S,accompanied by precipitation and enrichment of uranium minerals.

关键词： uranium mineralization metal sulfides hydrogen sulfide paragenetic sequences Shuanglong uranium deposit ore deposit geology

Achieving simultaneously high conversion and high selectivity for light olefins directly producing from syngas

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2023年

作者： Yuhan Sun Shanxi Research Institute Huairou Research Laboratory Institute of Carbon Neutrality ShanghaiTech University

The activity and selectivity are two primary indexes of a successful catalyst for chemical reactions. However,achieving a high activity and a high selectivity simultaneously is a long-standing challenge in catalysis, the socalled activity–selectivity trade-off. In the article recently published in Science, a research team led by Prof. Xiulian Pan and Prof. Xinhe Bao, from the Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Sciences(CAS), has demonstrated how this is achieved in the direct conversion of syngas into light olefins by using Ge-substituted AlPO-18 (GeAPO-18) in combination with ZnCrOx as a novel bifunctional catalyst [1].

关键词：

Chemical recycling of polyolefins:a closed-loop cycle of waste to olefins

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

National Science Review 2023年第9期10卷 92-109页

作者： Liang Zou Run Xu Hui Wang Zhiqiang Wang Yuhan Sun Mingfeng Li Sinopec Research Institute of Petroleum Processing Co. Ltd Shanghai Advanced Research Institute Chinese Academy of Sciences 2060 Research Institute Shanghai Tech University

The unsuitable disposal of plastic wastes has caused serious environmental pollution,and finding a green manner to address this problem has aroused wide concern.Plastic wastes,especially polyolefin wastes,are rich in carbon and hydrogen,and chemical recycling shows distinct advantages in their conversion into olefins and realizes a closed-loop cycling of plastic wastes.Plastic wastes should be labeled before disposal.The necessity for,and methods of,pretreatment are introduced in this paper and the whole recycling process of polyolefin wastes is also summarized.As the core technology pyrolysis,including thermal,catalytic and solvolysis processes,is introduced in detail due to its potential for future development.We also briefly describe the feasible strategies of pyrolytic oil refining and life cycle assessment of the chemical recycling process.In addition,suggestions and perspectives concerning the industrial improvement of polyolefin chemical recycling are proposed.

关键词： polyolefins pretreatment chemical recovery product refining life cycle assessment

Rh single atoms embedded in CeO_(2) nanostructure boost CO_(2) hydrogenation to HCOOH

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2022年第3期35卷 62-69页

作者： Bo Wu Xing Yu Min Huang Liangshu Zhong Yuhan Sun CAS Key Laboratory of Low-Carbon Conversion Science and Engineering Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201210China University of Chinese Academy of Sciences Beijing 100049China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China

CO_(2)hydrogenation to value-added chemicals is a promising pathway to solve CO_(2)-relevant environmental problems but still remains a great challenge.Herein,we report a CeO_(2)nanostructure supported Rh single atoms(Rh-SAs/CeO_(2))catalyst and was used for the efficient CO_(2)hydrogenation to HCOOH.The Rh-SAs/CeO_(2)exhibited high catalytic activity with turnover numbers(TON)up to 221 at 200℃,which was 4-fold to that of CeO_(2)supported Rh nanoparticles(Rh-NPs/CeO_(2)).Moreover,HCOOH selectivity for Rh-SAs/CeO_(2)reached 85%,much higher than that of Rh-NPs/CeO_(2)(46%).Mechanism studies revealed that Rh single atoms in the Rh-SAs/CeO_(2)with high metal atoms utilization efficiency not only provided abundant active sites to promote the catalytic activity,but also suppressed the decomposition of HCOOH to CO and benefited the formation of HCOOH.

关键词： CO_(2)hydrogenation Selectivity Single-atom catalysts(SACs) Rh HCOOH

Non-precious metal electrocatalysts for two-electron oxygen electrochemistry: Mechanisms, progress, and outlooks

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2022年第6期31卷 54-69,I0003页

作者： yuhan Wu Jianhui sun Shixue Dou Jingyu sun School of Environment Key Laboratory for Yellow River and Huai River Water Environmental and Pollution Control-Ministry of EducationHenan Normal UniversityXinxiang 453007HenanChina College of Energy Soochow Institute for Energy and Materials InnovationsKey Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu ProvinceSoochow UniversitySuzhou 215006JiangsuChina Institute for Superconducting and Electronic Materials University of WollongongWollongongNSW 2522Australia

Hydrogen peroxide (H_(2)O_(2)) is a valuable chemical for a wide variety of applications. The environmentally friendly production route of the electrochemical reduction of O_(2)to H_(2)O_(2) has become an attractive alternative to the traditional anthraquinone process. The efficiency of electrosynthesis process depends considerably on the availability of cost-effective catalysts with high selectivity, activity, and stability.Currently, there are many outstanding issues in the preparation of highly selective catalysts, the exploration of the interface electrolysis environment, and the construction of electrolysis devices, which have led to extensive research efforts. Distinct from the existing few comprehensive review articles on H_(2)O_(2) production by two-electron oxygen reduction, the present review first explains the principle of the oxygen reduction reaction and then highlights recent advances in the regulation and control strategies of different types of catalysts. Key factors of electrode structure and device design are discussed. In addition,we highlight the promising co-production combination of this system with renewable energy or energy storage systems. This review can help introduce the potential of oxygen reduction electrochemical production of high-flux H_(2)O_(2) to the commercial market.

关键词： 2e-ORR(oxygen reduction reaction) H_(2)O_(2) Heteroatom doping Single atom Carbon-based catalyst

Improvement of delayed diagnosis of ankylosing spondylitis in a Chinese population

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2022年第18期135卷 2256-2257页

作者： Yuhan Sun Zhuoran Hu Xuecheng Zhang Jun Qi Zhiming Lin Division of Rheumatology The Third Affiliated Hospital of Sun Yat-sen UniversityGuangzhouGuangdongChina Department of Nephrology Baoan Central Hospital of ShenzhenShenzhenGuangdongChina

To the Editor:Delayed diagnosis is a challenge in ankylosing spondylitis(AS),a representative phenotype of axial spondylarthritis(ax-SpA).Such delay might be improving,^([1])as there have been several updates on the diagnosis criteria of AS and ax-SpA,especially the 2009 Assessment of SpondyloArthritis International Society(ASAS),^([2])which recognized MRI as a powerful approach to detect early-stage lesions.However,there is still limited knowledge of whether the diagnostic delay has been improved in China.Therefore,we performed a comparative study of two datasets from the same hospital collected over 14 years.

关键词： diagnosis spondylitis delay

Comparative Study on Traction Battery Charging Strategies from the Perspective of Material Structure

在线全文

学校读者我要写书评

暂无评论

Automotive Innovation 2022年第4期5卷 427-437页

作者： Mengyang Gao Liduo Chen Tianyi Ma Weijian Hao Zhipeng sun Yuhan Sun Shiqiang Liu China Automotive Technology and Research Center Co.Ltd Tianjin 300300China CAT ARC NEV Test Center(Tianjin)Co.Ltd Tianjin 300300China

The service life of an electric vehicle is,to some extent,determined by the life of the traction battery.A good charging strat-egy has an important impact on improving the cycle life of the lithium-ion battery.Here,this paper presents a comparative study on the cycle life and material structure stability of lithium-ion batteries,based on typical charging strategies currently applied in the market,such as constant current charging,constant current and constant voltage charging,multi-stage constant current charging,variable current intermittent charging,and pulse charging.Compared with the reference charging strategy,the charging capacity of multi-stage constant current charging reaches 88%.Moreover,the charging time is reduced by 69%,and the capacity retention rate after 500 cycles is 93.3%.Through CT,XRD,SEM,and Raman spectroscopy analysis,it is confirmed that the smaller the damage caused by this charging strategy to the overall structure of the battery and the layered structure and particle size of the positive electrode material,the higher the capacity retention rate is.This work facilitates the development of a better charging strategy for a lithium-ion battery from the perspective of material structure.

关键词： Traction battery Charging strategy Cycle life Material evolution

Double-Layer-Optimizing Method of Hybrid Energy Storage Microgrid Based on Improved Grey Wolf Optimization

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

Computers, Materials & Continua 2023年第8期76卷 1599-1619页

作者： Xianjing Zhong Xianbo sun yuhan Wu College of Intelligent Science and Engineering Hubei Minzu UniversityEnshi445000China College of Automation Engineering Nanjing University of Aeronautics and AstronauticsNanjing210000China

To reduce the comprehensive costs of the construction and operation of microgrids and to minimize the power fluctuations caused by randomness and intermittency in distributed generation,a double-layer optimizing configuration method of hybrid energy storage microgrid based on improved grey wolf optimization(IGWO)is proposed.Firstly,building a microgrid system containing a wind-solar power station and electric-hydrogen coupling hybrid energy storage system.Secondly,the minimum comprehensive cost of the construction and operation of the microgrid is taken as the outer objective function,and the minimum peak-to-valley of the microgrid’s daily output is taken as the inner objective function.By iterating through the outer and inner layers,the system improves operational stability while achieving economic configuration.Then,using the energy-self-smoothness of the microgrid as the evaluation index,a double-layer optimizing configuration method of the microgrid is constructed.Finally,to improve the disadvantages of grey wolf optimization(GWO),such as slow convergence in the later period and easy falling into local optima,by introducing the convergence factor nonlinear adjustment strategy and Cauchy mutation operator,an IGWO with excellent global performance is proposed.After testing with the typical test functions,the superiority of IGWO is verified.Next,using IGWO to solve the double-layer model.The case analysis shows that compared to GWO and particle swarm optimization(PSO),the IGWO reduced the comprehensive cost by 15.6%and 18.8%,respectively.Therefore,the proposed double-layer optimizationmethod of capacity configuration ofmicrogrid with wind-solar-hybrid energy storage based on IGWO could effectively improve the independence and stability of the microgrid and significantly reduce the comprehensive cost.

关键词： Wind-solar microgrid hybrid energy storage optimization configuration double-layer optimization model IGWO