|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Recent advances of rhenium separation and enrichment in China: Industrial processes and laboratory trials显示文摘China is a major producer of rhenium, which is widely used in aerospace technologies(as superalloy) and petrochemical industries(as catalyst). There is a gap between the demand and fact for the enrichment of rhenium, due to its rather small content(10-9) in the earth's crust. Also, there is no available single occurrence of mineral rhenium. Instead, the rhenium is associated with either molybdenum or copper(of up to 0.2% in content) as a by-product in metallurgical industry. This makes the separation of rhenium from the major mineral metals a challenge. The recent progresses in the separation and enrichment of rhenium were reviewed in this paper, especially, the advances in China. The details of varied separation methods used either in laboratories or factories, such as ion-exchange, solvent extraction, separation utilizing extractive resins. liquid membrane, or novel materials, etc., were elaborated. Comparison of the different methods was disclosed and an outlook on the rhenium chemistry and industry in the future was brought forward. | Yin Wang Congyang Wang | 2018 | Chinese Chemical Letters2018，29，3： | 17 |
| 2 | Influence of grain size on the small fatigue crack initiation and propagation behaviors of a nickel-based superalloy at 650℃显示文摘GH4169 at 650℃ in atmosphere was investigated by using single edge notch tensile specimens. The number of main cracks and crack initiation mechanisms at the notch surface strongly depended on the grain size. The crack initiation life accounted for more percentages of the total fatigue life for the alloy with smaller grain size. The fatigue life generally increased with increasing crack initiation life. The small crack transited to long crack when its length reached 10 times the grain size. | Xumin Zhu Congyang Gong Yun-Fei Jia Runzi Wang Chengcheng Zhang Yao Fu Shan-Tung Tu Xian-Cheng Zhang | 2019 | Journal of Materials Science & Technology2019，35，8： | 9 |
| 3 | Stabilizing perovskite nanocrystals by controlling protective surface ligands density显示文摘After nanocrystals synthesis,the purification process with anti-solvents is an essential step to get clean nanocrystals,which could get rid of the by-products of the synthesis.It is generally recognized that this process could bring a positive effect for the afterward optoelectronic applications.Unfortunately,we found that the optical properties and photostability of perovskite CsPbBr3 nanocrystals were unavoidably deteriorated after they were washed with anti-solvents,and this deterioration is strongly related to the decreasing of surface ligands density.Therefore,in this paper,we tried to purposely not wash the CsPbBr3 nanocrystals solution after adding didodecyl dimethylammonium bromide (DDAB),and found the existing of DDAB in solution could result in a dramatically enhanced photostability.Inspired by these results,we proposed a new strategy to stabilize perovskite nanocrystals from the view of packaging process:adding protective ligands into the perovskite nanocrystals resin directly,then encapsulating them on blue light-emitting diodes (LED) chips.Surprisingly,stable LED devices (20 mA,2.7V) were achieved by this way,which can keep 80% of the initial photoluminescence (PL) intensity for more than 50 h,while the devices with CsPbBr3 nanocrystals without adding protective ligands into resin dropped to 50% of their initial PL intensity within 6 h.This approach offers a new thought to stabilize perovskite nanocrystals as down-conversion phosphor in quantum dots liquid crystal display. | Weilin Zheng Zhichun Li Congyang Zhang Bo Wang Qinggang Zhang Qun Wan Long Kong Liang Li | 2019 | Nano Research2019，12，6： | 4 |
| 4 | Direct silylation reactions of inert C-H bonds via transition metal catalysis显示文摘In the past thirty years,transition metal catalyzed silylation of inert C–H bonds has attracted intensive attention due to the importance and wide use of organosilicon compounds.In this review,the silylation reactions of inert C–H bonds catalyzed by transition metal complexes of Ir,Rh,Ru,Pt,Pd,Ni,and Sc,and the strategies utilized to access the site-selective C–H silylation products have been summarized.Furthermore,the mechanisms of C–H silylation reactions have been discussed briefly. | Yunhui Yang Congyang Wang | 2015 | Science China Chemistry2015，58，8： | 4 |
| 5 | Porous Pt nanoframes decorated with Bi(OH)3 as highly efficient and stable electrocatalyst for ethanol oxidation reaction显示文摘High-quality Pt-based catalysts are highly desirable for ethanol oxidation reaction(EOR),which is of critical importance for the commercial applications of direct ethanol fuel cells(DEFCs).However,most of the Pt-based catalysts have suffered from high cost and low operation durability.Herein a two-step method has been developed to synthesize porous Pt nanoframes decorated with Bi(OH)3,which show excellent catalytic activity and operation durability in both alkaline and acidic media.For example,the nanoframes show a mass activity of 6.87 A·mgPt−1 in alkaline media,which is 13.5-fold higher than that of commercial Pt/C.More importantly,the catalyst can be reactivated simply,which shows negligible activity loss after running for 180,000 s.Further in situ attenuated total reflection-infrared(ATR-IR)absorption spectroscopy and CO-stripping experiments indicate that surface Bi(OH)3 species can greatly facilitate the formation of adsorbed OH species and subsequently remove carbonaceous poison,resulting in a significantly enhanced stability towards EOR.This work may favor the tailoring of desired electrocatalysts with high activity and durability for future commercial application of DEFCs. | Xiaolei Yuan Bei Jiang Muhan Cao Congyang Zhang Xiaozhi Liu Qinghua Zhang Fenglei Lyu Lin Gu Qiao Zhang | 2020 | Nano Research2020，13，1： | 3 |
| 6 | Simple manganese carbonyl catalyzed hydrogenation of quinolines and imines显示文摘Manganese-catalyzed hydrogenation of unsaturated molecules has made tremendous progresses recently benefiting from non-innocent pincer or bidentate ligands for manganese.Herein,we describe the hydrogenation of quinolines and imines catalyzed by simple manganese carbonyls,Mn2(CO)10 or MnBr(CO)5,thus eliminating the prerequisite pincer-type or bidentate ligands. | Zelong Wang Lei Chen Guoliang Mao Congyang Wang | 2020 | Chinese Chemical Letters2020，31，7： | 2 |
| 7 | Sustainable chemical upcycling of waste polyolefins by heterogeneous catalysis显示文摘The mass production of disposable polyolefin products has led to serious plastic pollution and an imbalance between manufacturing and recycling.Given these challenges,the chemical upcycling of waste polyolefins has attracted extensive attention due to its high efficiency and economic benefits.Herein,we review the development of polyolefin chemical upcycling in heterogeneous catalysis.The status quo of polyolefin recycling is first discussed.We then introduce the advanced strategies for chemical upcycling in the view of different value-added products and discuss their challenges and prospects.Our in-depth analysis centers on the catalytic mechanism and the design principle of heterogeneous catalysts.Finally,we outlook the promising directions to facilitate the degradation process via polymer and catalyst design and optimized catalytic engineering.Innovative strategies are expected to promote the chemical upcycling of polyolefins,bringing great promise for the sustainable development of society. | Mingyu Chu Weilin Tu Shuangqiao Yang Congyang Zhang Qingye Li Qiao Zhang Jinxing Chen | 2022 | SusMat2022，2，2： | 2 |
| 8 | Diverse Fates of β-Silyl Radical under Manganese Catalysis: Hydrosilyla-tion and Dehydrogenative Silylation of Alkenes显示文摘Manganese-catalyzed hydrosilylation of alkenes has been underdeveloped for a long time. Herein, we describe a general, chemo- and regio-selective hydrosilylation of alkenes by using the Mn(CO)sBr catalyst with ample substrate scopes. Meanwhile, dehydrogenative silylation of aryl olefinscan be selectively achieved upon the catalysis of dinuclear Mn2(CO)10. Mechanistic experiments revealed diverse fates of the common intermediate β-silylradical, namely, hydrogen atom transfer (HAT) for the hydrosilylation and organometallic β-H elimination for the dehydrogenative silylation of olefins. | Xiaoxu Yang Congyang Wang | 2018 | Chinese Journal of Chemistry2018，36，11： | 2 |
| 9 | Zirconocene-mediated intermolecular coupling of one molecule of sitethered diyne with three molecules of organonitriles:One pot-formation of pyrrolo[3,2-c]pyridine derivatives via clea-vage of C=N triple bonds of organonitriles显示文摘 | Sun Xiaohua Wang Congyang Li Zhiping | | 0，，23： | 1 |
| 10 | Forging Three Single Bonds on One Carbon via Metal Carbynes or Carbyne Equivalents显示文摘Metal carbyne(M≡C)complexes have been discovered for nearly half a century,however,they gained far less study in comparison with metal-carbon single bond(M—C)and metal carbene(M=C)species in synthetic chemistry.Up to three sigma bonds are possibly forged on a single carbon through metal carbynes or carbyne equivalents,which holds great potentials in organic synthesis but also requires high efficiency of bond formation and precise control of reactivity and selectivity.Along this line,two systems based on stoi-chiometric transformations of manganese carbynes and ruthenium/rhodium-catalyzed reactions of diazo hypervalent iodine reagents,carbyne equivalents,have emerged recently,which will be highlighted herein.Future potentials and challenges in this intriguing area are also briefly discussed. | Yunhui Yang Congyang Wang | 2021 | Chinese Journal of Chemistry2021，39，12： | 1 |
| 11 | Manganese-Catalyzed Deoxygenative [3+2] Annulations of Ketones and Aldehydes via C–H Activation显示文摘Conventional reactive sites of ketones with aldehydes lie on the carbonyl andα-carbon positions,which lead to a wide range of classic reactions such as pinacol-coupling and aldol-type condensations.Herein,an unprecedented reactive site of aromatic ketones toward aldehydes has been revealed by using earth-abundant manganese catalysis,which enabled the first deoxygenative[3+2]annulations of ketones and aldehydes through C–H activation affording isobenzofuran derivatives.Mechanistic studies give hints on the dual role of triphenylborane additive in the reaction,that is,promoting C–H activation as a transmetalation reagent and activating aldehydes as a Lewis acid. | Ting Liu Yuanyuan Hu Yunhui Yang Congyang Wang | 2021 | CCS Chemistry2021，3，2： | 1 |
| 12 | Synchronous histiocytic sarcoma and diffuse large B cell lymphoma involving the stomach:a case report and review of the literature显示文摘 | Congyang L Xinggui W Hao L | | 0，，02： | 1 |
| 13 | Development of rocket propellant prevention medicine显示文摘 | HU Wenxiang TAN Congyang TAN Shengjian | 1999 | Space Medieine and Medicine Engineering1999，12，6： | 1 |
| 14 | Two-sided ultrasonic surface rolling process of aeroengine blades based on on-machine noncontact measurement显示文摘As crucial parts of an aeroengine,blades are vulnerable to damage from long-term operation in harsh environments.The ultrasonic surface rolling process(USRP)is a novel surface treatment technique that can highly improve the mechanical behavior of blades.During secondary machining,the nominal blade model cannot be used for secondary machining path generation due to the deviation between the actual and nominal blades.The clamping error of the blade also affects the precision of secondary machining.This study presents a two-sided USRP(TS-USRP)machining for aeroengine blades on the basis of on-machine noncontact measurement.First,a TS-USRP machining system for blade is developed.Second,a 3D scanning system is used to obtain the point cloud of the blade,and a series of point cloud processing steps is performed.A local point cloud automatic extraction algorithm is introduced to extract the point cloud of the strengthened region of the blade.Then,the tool path is designed on the basis of the extracted point cloud.Finally,an experiment is conducted on an actual blade,with results showing that the proposed method is effective and efficient. | Shulei YAO Xian CAO Shuang LIU Congyang GONG Kaiming ZHANG Chengcheng ZHANG Xiancheng ZHANG | 2020 | Frontiers of Mechanical Engineering2020，15，2： | 1 |
| 15 | Rhenium-Catalyzed Decarboxylative Tri-/Difluoromethylation of Styrenes with Fluorinated Carboxylic Acid-Derived Hypervalent Iodine Reagents显示文摘Summary of main observation and conclusion Herein,unprecedented rhenium-catalyzed decarboxylative oxytri-/difluoromethylation and Heck-type trifluoromethylation of styrenes have been developed by using hypervalent iodine(Ⅲ)reagents derived from cheap,stable,and easy-handling fluorinated carboxylic acids.Mechanistic studies revealed a radical decarboxylative trifluoromethylation pathway occurring in these reactions. | Yin Wang Yunhui Yang Congyang Wang | 2019 | Chinese Journal of Chemistry2019，37，12： | 1 |
| 16 | Study on the E-government Security Risk Management显示文摘 | Zhou Zhitian Hu Congyang | 2008 | UCSNS International Journal of Computer Science and Network Security2008，8，5： | 1 |
| 17 | Prognostic Value of Semi-Quantitative 18F-FDG PET/CT Parameters in Hodgkin’s Lymphoma显示文摘Objective:To assess the prognostic value of maximum standardized uptake value(SUVmax),metabolic tumor volume(MTV),and total lesion glycolysis(TLG)determined by 18F-fluorodeoxyglucose positron emission tomography-computed tomography(18F-FDG PET/CT)imaging in Hodgkin’s lymphoma patients.Methods:A total of 148 Hodgkin’s lymphoma patients diagnosed with lymph node biopsy from October 2014 to October 2015 were retrospectively analyzed followed by categorizing into good(125 cases)and poor(23 cases)prognosis groups.The chi-squared test was used to analyze the clinicopathological characteristics of Hodgkin’s lymphoma patients with the semi-quantitative 18F-FDG PET/CT parameters;the Spearman method was used to analyze the correlation between the semi-quantitative parameters and clinicopathological features of Hodgkin’s lymphoma;receiver operating characteristic curve was used to analyze the predictive value of the semi-quantitative parameters for poor prognosis of Hodgkin’s lymphoma patients.Results:Mean SUVmax,MTV,and TLG of the 148 cases of Hodgkin’s lymphoma were 7.26±2.38,12.46±3.14 cm3,and 76.83±18.56 g,respectively.Significant variations in the Ann Arbor stage and clinical classification were observed with different levels of semi-quantitative parameters(P<0.05).The semi-quantitative parameters were not correlated with age and gender(P>0.05)but positively correlated with Ann Arbor stage and clinical classification(P<0.05).These parameters in the poor prognosis group were higher than those in the good prognosis group(P<0.05).The area under the curve(AUC)of SUVmax,MTV,and TLG in predicting the poor prognosis group was 0.881,0.875,and 0.838,with cut-off values of 7.264,12.898 cm3,and 74.580g,as well as specificity of 88.8%,84.0%,and 78.4%,and sensitivity of 87.0%,87.0%,and 78.3%,respectively;the AUC of the combined prediction was 0.986,with a specificity of 97.6%and sensitivity of 86.3%.Conclusion:The semi-quantitative 18F-FDG PET/CT parameters provide valuable insights for Hodgkin’s lymphoma prognosis assessment. | Yong Zhou Congyang Hu Yue Li Xiting Xia Jun Lei Jingyi Chen Hua Xu Mei He Hongyun Jian Shuping You | 2023 | Proceedings of Anticancer Research2023，7，6： | 0 |
| 18 | Manganese-Group Organometaliic Catalysis显示文摘 | Congyang Wang | 2018 | Chinese Journal of Chemistry2018，36，7： | 0 |
| 19 | Site-Selective Polyolefin Hydrogenolysis on Atomic Ru for Methanation Suppression and Liquid Fuel Production显示文摘Catalytic hydrogenolysis of end-of-life polyolefins can produce value-added liquid fuels and therefore holds great promises in plastic waste reuse and environmental remediation.The major challenge limiting the recycling economic benefit is the severe methanation(usually>20%)induced by terminal C–C cleavage and fragmentation in polyolefin chains.Here,we overcome this challenge by demonstrating that Ru single-atom catalyst can effectively suppress methanation by inhibiting terminal C–C cleavage and preventing chain fragmentation that typically occurs on multi-Ru sites.The Ru single-atom catalyst supported on CeO_(2)shows an ultralow CH_(4)yield of 2.2%and a liquid fuel yield of over 94.5%with a production rate of 314.93 gfuels gRu^(−1)h^(−1)at 250℃for 6 h.Such remarkable catalytic activity and selectivity of Ru single-atom catalyst in polyolefin hydrogenolysis offer immense opportunities for plastic upcycling. | Mingyu Chu Xianpeng Wang Xuchun Wang Xiangxi Lou Congyang Zhang Muhan Cao Lu Wang Youyong Li Sibao Liu Tsun-Kong Sham Qiao Zhang Jinxing Chen | 2023 | Research2023，，3： | 0 |
| 20 | Manganese-catalyzed bicyclic annulations of imines and α,β-unsaturated esters via C-H activation显示文摘A manganese-catalyzed bicyclic annulation of imines with α,β-unsaturated esters via C–H activation is described, which provides an expedient access to fused β-lactams in one-step operation with high efficiency and good functional group tolerance. Of note, both ketimines and aldimines are amenable to this transformation. Mechanistic studies have identified a five-membered azamanganacycle as the key reaction intermediate. | Yuanyuan Hu Congyang Wang | 2016 | Science China Chemistry2016，59，10： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员