检索结果-南通市图书馆

SYNTHESIS OF cis-1, 4-POLYBUTADIENE WITH nickel catalyst INVESTIGATIONS ON INTERACTIONS BETWEEN THE CATALYTIC COMPONENTS BY USING UV-VIS SPECTRUM

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 Journal of Polymer Science 1987年第1期5卷 45-52页

作者：陈滇宝许光唐学明 Qingdao College of Chemical Technology Qingdao

Ni（Ⅱ） naphthenate in hydrogenated gasoline or toluene will appear light green, which is the result of absorption in the red and blue bands of the spectrum. The three peaks caused by the spin-allowed d-d transitions are 403, 680, and 1170nm respectively, and are similar to those of Ni（H2O）6+2. The configuration of Ni（Ⅱ） complex is *** a two-component system of Ni（naph）2-Al（i-Bu）3, the naphthenate ligand attached to Ni（Ⅱ） can be exchanged for the alkyl group on tri-isobutylaluminium, if Al（i-Bu）3/Ni（naph）2 in a system. containing metalalkyl and naphthenate does not exceed the value of 0.53. At a higher ratio, Al（i-Bu）3/Ni（naph）2>0.53, Ni（Ⅱ） is reduced to Ni（Ⅰ） and Ni（O）.In a two-component system Ni（naph）2-BF3·OEt2, a part of the naphthenate can be exchanged for halogen. A new Ni（Ⅱ） complex is formed, which consists of three new d-d bands in the region 360-1660 nm.

关键词： cis-1, 4-polybutadiene nickel catalyst Ziegler-Natta catalyst UV-VIS spectrum

Selective Hydrogenation of Maleic Anhydride to Succinic Anhydride over nickel catalyst Supported on Carbon Microspheres

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

China Petroleum Processing & Petrochemical Technology 2021年第4期23卷 75-82页

作者： Zhou Yafen Chen Qilin Wang Qing Song Yu Zhou Limei Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province China West Normal UniversityNanchong 637002

The colloidal carbon microspheres(CMS)were prepared by the hydrothermal *** nickel catalysts supported on carbon microspheres(Ni/CMS)were further prepared and were characterized by the Fourier transform infrared spectroscopy(FTIR),the X-ray diffraction(XRD),the scanning electron microscopy(SEM),the transmission electron microscopy(TEM),and the N_(2)adsorption *** selective hydrogenation of maleic anhydride(MA)to succinic anhydride(SA)over the Ni/CMS catalysts was *** results indicated that the Ni/CMS catalyst,which was prepared with glucose as carbon source and calcined at 500℃,exhibited the best *** hydrogen pressure,reaction temperature,and reaction time could significantly affect the conversion of maleic anhydride during the hydrogenation reaction.A 98.4%conversion of MA and an 100%selectivity to SA were achieved over the Ni/CMS catalyst in acetic anhydride solvent under mild conditions covering a temperature of 90℃,a H2 pressure of 1.0 MPa,and a reaction time of 3 h.

关键词： carbon microsphere nickel catalyst hydrogenation maleic anhydride succinic anhydride

Trinuclear nickel catalyst for Water Oxidation:Intramolecular Proton-Coupled Electron Transfer Triggered Trimetallic Cooperative O-O Bond Formation

在线全文

学校读者我要写书评

暂无评论

CCS Chemistry 2023年第1期5卷 245-256页

作者： Qi-Fa Chen Yao Xiao Rong-Zhen Liao Ming-Tian Zhang Center of Basic Molecular Science(CBMS) Department of ChemistryTsinghua UniversityBeijing 100084 Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of EducationSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074

We report a molecular trinuclear nickel(TNC-Ni)catalyst for water oxidation that exhibited high catalytic performance and stability under neutral conditions(pH 7).Electrochemical studies disclosed that cooperation among the three nickel sites plays a vital role in both charge accumulation and O-O bond *** TNC-Ni catalyst could accomplish 4e−oxidation of water by involving all three nickel sites and the O-O bond formation was triggered by a charge distribution process from 5 to 5_(dp) via proton-coupled electron transfer.

关键词： water oxidation proton-coupled electron transfer nickel catalyst artificial photosynthesis O-O bond formation

Catalytic performance of cement clinker supported nickel catalyst in glycerol dry reforming

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

Journal of Energy Chemistry 2014年第5期23卷 645-656页

作者： Hua Chyn Lee Kah Weng Siew Maksudur R.Khan Sim Yee Chin Jolius Gimbun Chin Kui Cheng Faculty of Chemical & Natural Resources Engineering Universiti Malaysia Pahang Lebuhraya Tun Razak 26300 Gambang Kuantan Pahang Malaysia Centre of Excellence for Advanced Research in Fluid Flow Universiti Malaysia Pahang Lebuhraya Tun Razak 26300 Gambang Kuantan Pahang Malaysia

The paper reports the development of cement clinker-supported nickel （with metal loadings of 5 wt%, 10 wt%, 15 wt% and 20 wt%） catalysts for glycerol dry （CO2） reforming reaction. XRF results showed that CaO constituted 62.0% of cement clinker. The physicochemical characterization of the catalysts revealed 32-folds increment of BET surface area （SBET） with the addition of nickel metal into the cement clinker, which was also corroborated by FESEM images. Significantly, XRD results suggested different types of Ni oxides formation with Ni loading, whilst Ca3SiO5 and Ca2Al0.67Mn0.33FeO5 were the main crystallite species for pure cement clinker. Temperature-programmed reduction analysis yielded three domains of H2 reduction peaks, viz. centered at approximately 750 K referred to as type-Ⅰ peaks, another peaks at 820 K denoted as type-Ⅱ peaks and the highest reduction peaks, type-Ⅲ recorded at above 1000 K. 20 wt% Ni was found to be the best loading with the highest XG and H2 yield, whilst the lowest methanation activity. Syngas with lower H2/CO ratios （0.6 to 1.5） were readily produced from glycerol dry reforming at CO2-to-Glycerol feed ratio （CGR） of unity. Nonetheless, carbon deposit comprised of whisker type （Cv） and graphitic-like type （Cc） species were found to be in majority on 20 wt%Ni/CC catalysts.

关键词： cement clinker dry reforming glycerol nickel catalyst syngas

EFFECT OF La2O3 AND CeO2 ON CH4-CO2 REFORMING nickel catalyst

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 1997年第2期 128-134页

作者： LI Shu-Ying FENG Zhong-Wei WANG Chang-You (Cl Lab., Institute of Coal Chemical Engineering, Taiyuan University of Technology Taiyuan, Shanxi 030024)YANG Xue-Ren REN Jie CHEN Yang-Guang (Institute of Coal Chemistry, The Chinese Academy of Sciences Taiy

The reforming of CH4 with CO2 was carried out on alumina supported nickel catalysts with or without La2O3 or CeO2. The catalysts were characterized by XRD and XPS techniques. XRD results show that La2O3 and CeO2 can reduce the interaction between NiO and γ-Al2O3,improve the dispersion of NiO and Ni, and inhibit the growth of Ni crystal during reaction. XPS results indicate that La2O3 and CeO2 have some effect on nickel in oxide state.

关键词： CH4-CO2 reforming nickel catalyst La2O3 CeO2

Influence of Backbone and Axial Substituent of catalyst onα-Imino-ketone nickel Mediated Ethylene(Co)Polymerization

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 Polymer Science 2022年第5期40卷 469-477页

作者： Yu-Kai Chu Xiao-Qiang Hu Yue Zhang Da-Jun Liu Yi-Xin Zhang Zhong-Bao Jian College of Chemistry and Environmental Engineering Changchun University of Science and TechnologyChangchun 130022China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 730022China

Theα-imino-ketone nickel catalyst is an emerging versatile platform that is easy to prepare and allows for the production of branched high molecular weight functionalized ***,study on this catalyst system is rare thus *** this contribution,by introducing different backbones,flexible and rigid axial substituents into theα-imino-ketone framework,a family of cationic nickel catalysts were synthesized and fully *** the addition of any activator,systematic studies on ethylene polymerization and copolymerization with polar monomers were performed to explore the influence of both backbone and axial substituent on catalytic activity,polymer molecular weight,branching density and *** particular,owing to the unique semi-opening feature of theα-imino-ketone framework,the preferred nickel catalyst exhibited high activity of 175 kg·mol^(-1)·h^(-1)to produce functionalized polyethylene with molecular weight of 13.4 kg·mol^(-1)and comonomer incorporation of 2.9 mol%.

关键词： Olefin polymerization α-Imino-ketone ligand nickel catalyst Polar monomer

Concerted Steric and Electronic Strategy in Thermostable Salicylaldiminato nickel catalysts for Ethylene(Co)polymerization

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2024年第8期42卷 1085-1092页

作者： Hong-Yu Ji Hong-Liang Mu Chun-Feng Tang Yu-Xing Zhang Yue Chi Zhong-Bao Jian Key Laboratory of Advanced Structural Materials Ministry of EducationSchool of Materials Science and EngineeringChangchun University of TechnologyChangchun 130012China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China

Olefin polymerization is one of the most im portant chemical reactions in *** work presents a strategy that emphasizes the synergistic meta/poro-steric hindrance of N-aryl groups and electronic effects in newly synthesized neutral salicylaldiminato nickel *** nickel(Ⅱ)catalysts exhibit exceptional thermostability,ranging from 30℃to 130℃,demonstrating enhanced catalytic activities and broadly regulated polyethylene molecular weights(3-341 kg·mol^(-1))and controlled polymer branch density(2-102 brs/1000C).The preferred catalyst Ni3 with concerted steric and electronic effects enables the production of solid-state semi-crystalline polyethylene materials at temperatures below 90℃.Notably,Ni3 exhibits an impressive tolerance of 110℃and can withstand even the challenging polymerization temperature of 130℃,leading to the production of polyethylene wax and ***,functionalized polyethylene is produced.

关键词： Polyolefin Salicylaldiminato ligand nickel catalyst Oil Wax

Dry reforming reaction over nickel catalysts supported on nanocrystalline calcium aluminates with different CaO/Al_2O_3 ratios

在线全文

学校读者我要写书评

暂无评论

Journal of Natural Gas Chemistry 2012年第2期21卷 178-183页

作者： Atiyeh Ranjbar Mehran Rezaei catalyst and Advanced Materials Research Laboratory Chemical Engineering DepartmentFaculty of Engineering University of Kashan catalyst and Advanced Materials Research Laboratory Chemical Engineering Department Faculty of Engineering University of Kashan Institute of Nanoscience and Nanotechnology University of Kashan

Nanocrystalline calcium aluminates with different CaO/Al2O3 ratios were prepared by a facile co-precipitation method using Poly（ethylene glycol）-block-poly（propylene glycol）-block-poly（ethylene glycol）（PEG-PPG-PEG, MW： 5800） as a surfactant. They were employed as catalyst support for nickel catalysts in methane reforming with carbon dioxide. The prepared samples were characterized by X-ray diffraction （XRD）, N2 adsorption （BET）, temperature-programmed reduction and oxidation （TPR-TPO）, and scanning electron microscopy （SEM） techniques. catalysts showed a relatively high catalytic activity and stability. TPR analysis revealed that the catalysts with higher CaO content are more difficult to be reduced. TPO analysis showed that the 5 wt%Ni/CA and 5 wt%Ni/C12A7 catalysts with higher CaO amount were effective against coke deposition.

关键词： calcium aluminate nickel catalyst dry reforming

Macrocyclic Binuclearα-Diimine nickel catalysts for Ethylene Polymerization

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2023年第5期39卷 797-802页

作者： YANG Jingshuang ZHANG Yuxing JIAN Zhongbao State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022P.R.China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026P.R.China

Polyolefins are globally important *** weight and molecular weight distribution are two key parameters for determining the properties of polyolefin *** this contribution,we develop a strategy for combining the macrocyclic framework and the binuclear effect into the benchmarkα-diimine late transition metal catalysts,and thus macrocyclic binuclearα-diimine nickel catalysts(Ni_(2)-Me and Ni_(2)-iPr)are *** to the classical Brookhart's acyclic mononuclearα-diimine nickel analogues(Ni_(1)-Me and Ni_(1)-iPr),these nickel catalysts exhibit enhanced thermostability(up to 110℃)and produce polyethylenes with higher molecular weights(up to 7 times)and lower branching densities(as low as 9 branches/1000C)in methylaluminoxane(MAO)activated ethylene *** translates into the ability of the catalyst to afford more linear high molecular weight *** particular,bimodal polyethylenes with broad molecular weight distributions(Mw/Mn=8.08-14.66)are generated by the sole *** work affords diverse polyethylenes.

关键词： Polyolefin nickel catalyst Diimine ligand Macrocyclic binuclear strategy Bimodal polyethylene