cobalt
cobalt的相关文献在1991年到2022年内共计142篇,主要集中在化学、自动化技术、计算机技术、肿瘤学
等领域,其中期刊论文140篇、专利文献2篇;相关期刊82种,包括精细石油化工进展、石油化工、石油炼制与化工等;
cobalt的相关文献由367位作者贡献,包括Fu You PAN、YANG Guo-Yu、ZHENG Shou-Tian等。
cobalt
-研究学者
- Fu You PAN
- YANG Guo-Yu
- ZHENG Shou-Tian
- 王蕾
- 2. Department of Chemistry Tongji Medical University Wuhan 430030 China)
- A. M. Reda
- AKDIM
- ATALAYTevfik
- Abdelrahman A. Badawy
- Abeer Sharfalddin
- Adama Sy
- Adenilda Cristina Honorio Franca
- Ahamed Abdel-Latif Mohamed
- Aichata Kane
- Alexander J. Pfister
- Alexander S.Borisenko
- Alla SPOJAKINA
- Anderson Dourado Galvao
- Anuj Pokle
- Ao Gong
- Ayana Ozaki
- B
- BINGOLHaluk
- Bareki Batlokwa
- Ben J. Burston
- Bing Hui WANG
- Bo Shu
- Bojie Li
- C.M.Tian
- CHAMOUN
- CHEN Lu
- Can Hui LU
- Catalina Bosch Ojeda
- Chan-Gi Lee
- Chang Hua GE
- Chang Hua GE(Department of Chemistry Taizhou Teachers College 317000 Zhejiang)
- Chen-Bin Wang
- Cheng Guo JIA~* Yun Pu WANG Han Yu FENG Institute of ChemistryNorthwest Normal UniversityLanzhou 730070
- Chengchang Jia Xiaoyang Liu Xiuhu Guan Xuekuan Su Jun Zhao Zizhang Xie 1) Materials Science and Engineering School University of Science and Technology Beijing Beijing 100083 China 2) Beijing Research Institute of Powder Metallutrgy Beijing 10005
- Chih-Wei Tang
- Chin-Liang Lai
- Christelle N. T. Dzesse
- Claudia Cristina de Sousa
- Cynthia Locard
- DEMIRCI
- Daniela Pasqui
- David Fresh
- Denis R. Khusainov
- Dinesh Amalnerkar
- Djiby Lo
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Zechao Shen;
Mei Qu;
Jueli Shi;
Freddy E.Oropeza;
Victor A.de la Peña O’Shea;
Giulio Gorni;
C.M.Tian;
Jan P.Hofmann;
Jun Cheng;
Jun Li;
Kelvin H.L.Zhang
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摘要:
Perovskite LaCoO_(3) is being increasingly explored as an effective low-cost electrocatalyst for the oxygen evolution reaction(OER).Sr doping in LaCoO_(3)(La1-xSrxCoO_(3))has been found to substantially increase its catalytic activity.In this work,we report a detailed study on the evolution of the electronic structure of La1-xSrxCoO_(3) with 0≤x≤1 and its correlation with electrocatalytic activity for the OER.A combination of X-ray photoemission spectroscopy(XPS)and X-ray absorption spectroscopy(XAS)was used to unravel the electronic density of states(DOS)near the Fermi level(EF),which provide insights into the key electronic structure features for the enhanced OER catalytic activity.Detailed analysis on the Co L-edge XAS suggest that LaCoO_(3) has a low spin state with t_(2g)^(6) e_(g)^(0) configuration at room temperature.This implies that the high OER catalytic activity of LaCoO_(3) should not be rationalized by the occupancy of eg=1 descriptor.Substituting Sr^(2+) for La^(3+) in LaCoO_(3) induces Co4+oxidation states and effectively dopes hole states into the top of valence band.A semiconductor-to-metal transition is observed for x>0.2,due to the holeinduced electronic DOS at the EF and increased hybridization between Co 3 d and O 2 p.Such an electronic modulation enhances the surface adsorption of the*OH intermediate and reduces the energy barrier for interfacial charge transfer,thus improving the OER catalytic activity in La_(1-x)Sr_(x)CoO_(3).In addition,we found that the La_(1-x)Sr_(x)CoO_(3) surface undergoes amorphization after certain period of OER measurement,leading to a partial deactivation of the electrocatalyst.High Sr doping levels accelerated the amorphization process.
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Lei Tian;
Ao Gong;
Xuangao Wu;
Xiaoqiang Yu;
Zhifeng Xu;
Lijie Chen
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摘要:
An ammonia-based system was used to selectively leach cobalt(Co)from an African high-silicon low-grade Co ore,and the other elemental impurities were inhibited from leaching in this process.This process was simple and environmentally friendly.The results revealed that the leaching ratio of Co can reach up to 95.61%using(NH_(4))_(2)SO_(4)as a leaching agent under the following materials and conditions:(NH_(4))_(2)SO_(4)concentration 300 g/L,reductant dosage 0.7 g,leaching temperature 353 K,reaction time 4 h,and liquid-solid ratio 6 mL/g.The leaching kinetics of Co showed that the apparent activation energy of Co leaching was 76.07 kJ/mol(i.e.,in the range of 40-300 kJ/mol).This indicated that the leaching of Co from the Co ore was controlled by an interfacial chemical reaction,and then the developed leaching kinetics model of the Co can be expressed as 1-(1-α)^(1/3)=28.01×10~3×r_0^(-1)×C_((NH_(4))_(2)SO_(4))^(1.5)×exp(-76073/8.314 T)×t,whereαis the leaching ratio(%)of Co,r_0 is the average radius(m)of the Co ore particles,T is the temperature(K),and C_((NH_(4))_(2)SO_(4))is the initial reactant concentration(kg/m^(3)).
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Zhangsen Chen;
Gaixia Zhang;
Yuren Wen;
Ning Chen;
Weifeng Chen;
Tom Regier;
James Dynes;
Yi Zheng;
Shuhui Sun
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摘要:
The electroreduction reaction of CO_(2)(ECO_(2)RR)requires high-performance catalysts to convert CO_(2)into useful chemicals.Transition metal-based atomically dispersed catalysts are promising for the high selectivity and activity in ECO_(2)RR.This work presents a series of atomically dispersed Co,Fe bimetallic catalysts by carbonizing the Fe-introduced Co-zeolitic-imidazolate-framework(C-Fe-Co-ZIF)for the syngas generation from ECO_(2)RR.The synergistic effect of the bimetallic catalyst promotes CO production.Compared to the pure C-Co-ZiF,C-Fe-Co-ZIF facilitates CO production with a CO Faradaic efficiency(FE)boost of 10%,with optimal FE_(CO)of 51.9%,FE_(H_(2))of 42.4%at-0.55 V,and CO current density of 8.0 mA cm^(-2)at-0.7 V versus reversible hydrogen electrode(RHE).The H_(2)/CO ratio is tunable from 0.8 to 4.2 in a wide potential window of-0.35 to-0.8 V versus RHE.The total FE_(CO+H_(2))maintains as high as 93%over 10 h.The proper adding amount of Fe could increase the number of active sites and create mild distortions for the nanoscopic environments of Co and Fe,which is essential for the enhancement of the CO production in ECO_(2)RR.The positive impacts of Cu-Co and Ni-Co bimetallic catalysts demonstrate the versatility and potential application of the bimetallic strategy for ECO_(2)RR.
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Kittithad Wonglekha;
Weerachon Tolek;
Okorn Mekasuwandumrong;
Wasu Chaitree;
Piyasan Praserthdam;
Kiat Moon Lee;
Joongjai Panpranot
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摘要:
An effect of phase compositions(rutile,Rut and anatase,Ant)of TiO_(2)supports on the selective hydrogenation of furfural to furfuryl alcohol was investigated.The 15%wt Ni/TiO_(2)catalysts were prepared by incipient impregnation method.The result showed that Ni supported on anatase-rutile mixed phase TiO_(2)(91%Rut and 9%Ant,A2)provided the highest furfuryl alcohol yield at 43.8%due to the relatively strong Ni-TiO_(2)interaction,its appropriate crystallite sizes,and high average pore sizes.Furthermore,the effect of cobalt as a promoter on Ni/TiO_(2)-A2 catalysts was studied.The result showed that the Ni-Co/TiO_(2)-A2 catalysts exhibited poorer catalyst performances compared to the monometallic Ni/TiO_(2),probably because addition of cobalt can lower the reduction temperatures of Ni/TiO_(2)and weaken the metal-support interaction.
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摘要:
In September 2022,the Ministry of Natural Resources of PRC released the 2022 China Mineral Resources Report,which focuses on such information since 2021 as the new progress made in China’s geological survey;reconnaissance,exploration and development of mineral resources,mine ecological rehabilitation and green mine construction;new changes in policies and regulations related to mineral resources;new measures taken in management of mineral resources;new scientific and technological innovation;and new achievements obtained in the international cooperation on geological and mineral resources with countries participating in the“Belt and Road Initiative”.
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Zhikun Liang;
Qinglei Chong;
Fanke Meng
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摘要:
Catalytic generation of cobalt enolates through ring-opening of easily accessible cyclopropanols, subsequent β-hydride elimination and site-selective reinsertion followed by diastereo-and enantioselective additions to aldimines is presented. Such a process represents an unprecedented reaction pathway of cobalt homoenolates, affording a wide range of β-amino-ketones in up to 95% yield, 90:10 dr and 99:1 er without the need of any stoichiometric amount of additive or reagent.
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Sihan Peng1;
Ji Yang2;
Guixia Liu1;
Zheng Huang12
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摘要:
Regiodivergent 1,2-hydroboration of 1,3-dienes with pinacolborane has been accomplished by well-defined cobalt complexes of different bidentate ligands. The iminopyridine-cobalt system is selective for Markovnikov 1,2-hydroboration to form allylboronates, while the FOXAP-cobalt(FOXAP=(S)-1-(diphenylphosphino)-2-[(S)-4-isopropyloxazolin-2-yl]ferrocene) catalyst effects the complementary anti-Markonikv 1,2-hydroboration to afford homoallyboronates with high regioselectivity.
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摘要:
钴(Co),英文名称Cobalt,原子序数27,属于Ⅷ族(重有色金属)。钴是一种非常稀缺的小金属资源,素有“工业味精”和“工业牙齿”之称,是重要的战略资源之一。钴在地壳中的平均含量为0.001%(质量)。
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Thierno Moussa Seck;
Adama Sy;
Djiby Lo;
Papa Aly Gaye;
Mohamed Lamine Sall;
Ousmane Diouf;
Mahy Diaw;
Mohamed Gaye
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摘要:
The ligand 1-(1-(pyridin-2-yl)ethylidene)carbonohydrazide (H4L1) and 1-(pyridin-2-ylmethylene)carbonohydrazide (H4L2) were prepared by reaction of carbonohydrazide with 2-acetylpyridine or pyridine carbaldehyde respectively in a reflux methanol solution. The complexes are prepared by reaction of the ligand with the appropriate metal salt. These complexes are well characterized by elemental analysis, IR and UV spectroscopies and their structure were determined by single X-ray diffraction technic. In the crystal of the dinuclear complex [Mn2(H4L1)2(H2O)4]·Cl4, 1) each Mn(II) center is seven coordinated by two nitrogen atom and one carbonyl atom of the one ligand and one nitrogen atom and one carbonyl oxygen atom of another ligand molecule. The coordination sphere is completed by two water molecules. Each of the carbonyl oxygen atom acts as bridge between the two Mn(II) centers. In the mononuclear complex [Co(H4L2)(NO3)(H2O)2]·(NO3);2) the Co(II) center is heptacoordinated. The ligand acts in tridentate fashion through two nitrogen atoms and one carbonyl oxygen atom. Two water molecules lie in the apical positions. One nitrate group acts in bidentate manner while the other nitrate group remains uncoordinated. In both complexes the coordination polyhedral are best described as a pentagonal bipyramid. The molecules are linked together in each case by multiple hydrogen bond interaction resulting in a three-dimensional network. The crystallographic data has been deposited in Cambridge Crystallographic Data Centre [CCDC No. 1944387 (complex 1) and 1944386 (complex 2)].