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Cellulose conversion to polyols on supported Ru catalysts in aqueous basic solution

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Science china chemistry 2010年第7期53卷 1476-1480页

作者： DENG TianYin,SUN JiYing & LIU HaiChao Beijing national laboratory for Molecular {2.,State Key laboratory for Structural chemistry of Stable and Unstable Species green chemistry center,college of chemistry and Molecular engineering,peking {12.,Beijing {13.,china Beijing national laboratory for Molecular {2. State Key Laboratory for Structural Chemistry of Stable and Unstable Species Peking University Beijing China green chemistry {2. College of Chemistry and Molecular Engineering Peking University Beijing China

It is of great significance and challenge to achieve direct conversion of cellulose to specific polyols,e.g.,ethylene glycol and propylene *** such selective conversion,a novel one-pot approach was studied by combination of alkaline hydrolysis and hydrogenation on supported Ru catalysts.A wide range of bases including solid bases,e.g.,Ca(OH)2.and La2.3.and phosphate buffers were examined in the cellulose reaction in water,and the cellulose conversions and polyol products depended largely on the basicity or pH values in the aqueous *** glycol,1,2.propanediol,and especially 1,2.5-pentanetriol were obtained with selectivities of 15%,14% and 2.%,respectively,at 3.% cellulose conversion at pH 8 in phosphate buffer *** preliminary results provide potentials for efficient conversion of cellulose to targeted polyols by using the advantages of bases.

关键词： cellulose polyols Ru catalysts solid bases aqueous basic solutions

Online diagnosis of electron excitation temperature in CH_4+H_2.discharge plasma at atmospheric pressure by optical emission spectra

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Science china(Physics,Mechanics & Astronomy) 2008年第12期51卷 1892-1896页

作者： CUI JinHua1, XU ZhenFeng2. ZHANG JiaLiang3., NIE QiuYue3. XU GenHui4 & REN LongLiang5 1 Faculty of {2. and Chemical engineering, Liaoning Normal university, Dalian 11602.,{3. 2.Technique center for Modern Education, Liaodong college, Dandong 12.709,{3. 3.State Key laboratory for Materials Modification by Laser, Ion and Electron Beams, Dalian university of Technology, Dalian 11602.0}{3. 4 college of Chemical engineering, Tianjin university, Tianjin 3.0072.{3. 5 Department of Physics, Science college, Tianjin university, Tianjin 3.0072.{3. Faculty of chemistry and Chemical engineering Liaoning Normal University Dalian China Technique center for Modern Education Liaodong College Dandong China State Key laboratory for Materials Modification by Laser Ion and Electron Beams Dalian University of Technology Dalian China college of Chemical engineering Tianjin University Tianjin China Department of Physics Science College Tianjin University Tianjin China

Methane coupling under low temperature plasmas at atmospheric pressure is a green process by use of renewable sources of energy. In this study, CH4+H2.dis- charge plasma was on-line diagnosed by optical emission spectra so as to char- acterize the discharge system and to do spade work for the optimization of the technical parameters for future commercial production of methane coupling under plasmas. The study was focused on a calculation method for the online diagnosis of the electron excitation temperature in CH4+H2.discharge plasma at atmospheric pressure. The diagnostic method is easy, efficient and fairly precise. A serious er- ror in a literature was corrected during the reasoning of its series of equations formerly used to calculate electron temperatures in plasmas.

关键词： low temperature plasma electron excitation temperature optical emission spectrum online diagnosis

New Strategy to Construct Fused/Bridged/Spiro Carbocyclic Scaffolds Based on the Design of Novel 6-C Synthon Precursor

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New Strategy to Construct Fused/Bridged/Spiro Carbocyclic Sc...

第十六届全国金属有机化学学术讨论会

作者： Jia Liu,~(1,2) Xi Wang,~1 Chang-Liang Sun,~1 Bi-Jie Li,~1 Min Wang,~2 Zhang-Jie Shi~(*1,3. 1 Beijing national laboratory of Molecular sciences(BNLMS) and Key laboratory of Bioorganic chemistry and Molecular engineering of Ministry of Education,college of chemistry and Molecular engineering and green chemistry center,peking {13.,Beijing 100871 and Department of chemistry,2 {13. of Agriculture of china,Beijing 100094 and 3.State Key laboratory of Organometallic chemistry,Shanghai Institute of Organic chemistry,Chinese Academy of sciences,Shanghai 20003.,china

＜正＞Fused/bridged/spiro carbocyclic ring scaffolds are one of most important motifs in natural and synthetic organic *** design a new 6-C synthon,which could be applied to construct complex poly-,spiro-and bridged systems through the simple sequential chemical transformations from acyclic precursor by a one-pot strategy from

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LiCl-Promoted Pd（Ⅱ）-Catalyzed ortho Carbonylation of N,N-Dimethylbenzylamines

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LiCl-Promoted Pd（Ⅱ）-Catalyzed ortho Carbonylation of N,N-...

第十六届全国金属有机化学学术讨论会

作者： Hu Li,~1 Gui-Xin Cai,~1 Zhang-Jie Shi~(*1,2. 1 Beijing national laboratory of Molecular {2.(BNLMS),{3. green chemistry center and Key laboratory of Bioorganic chemistry and Molecular engineering of Ministry of Education,college of chemistry,{12.,Beijing {13.,china 2.State Key laboratory of Organometallic chemistry,Chinese Academy of {2.,Shanghai 2.003.,china

＜正＞Palladium-catalyzed highly regioselective carbonylation of substituted N,N-dimethylbenzylamines was developed with the assistance of *** ortho-functionalized N,N-dimethylbenzylamine was further transformed into ...

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C-H Functionalization via Transition Metal Catalyzation

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C-H Functionalization via Transition Metal Catalyzation

中国化学会第二十五届学术年会

作者： Xiaobing Wan, Zhongxun Ma, Zhangjie Shi* Beijing national laboratory for Molecular {2. (BNLMS) and The Key laboratory of Bioorganic chemistry and Molecular engineering of Ministry of Education, college of chemistry and green chemistry center, peking university, Beijing {12.,{13. and State Key laboratory of Organometallic chemistry, Chinese Academy of {2., Shanghai 2.003.,{13.

Fe-Catalyzed Cross-Coupling of Aryl and Vinyl Carboxylates with Grignard Reagents under Mild Conditions

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Fe-Catalyzed Cross-Coupling of Aryl and Vinyl Carboxylates w...

第十六届全国金属有机化学学术讨论会

作者： Bi-Jie Li,Li Xu,and Zhang-Jie Shi~* Beijing national laboratory of Molecular {2.(BNLMS) and Key laboratory of Bioorganic chemistry and Molecular engineering of Ministry of Education,college of chemistry and green chemistry center,peking {12.,Beijing 100080,{13.

＜正＞Previously,we have reported the nickel-catalyzed cross-coupling of aryl carboxylates with aryl boron and aryl zinc reagents,a class of novel transformation based on the C（aryl）-O bond *** reported herein an iron-catalyzed cross-coupling of aryl and vinyl carboxylates with Grignard reagents which proceeded with lower

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Size control of silver nanoparticles via continuous-flow biosynthesis process

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Size control of silver nanoparticles via continuous-flow bio...

颗粒学最新进展研讨会——暨第十届全国颗粒制备与处理研讨会

作者： Hongyu Liu~(a,b,c,d) Jiale Huang~(b,c,d) Qingbia Li~(a,b,c,d) Lijing Wu~(b,c,d) a(Environmental Science Research center,college of Oceanography and Environmental Science,Xiamen {2.,Xiamen 3.1005,PR{3.) b(Department of Chemical and Biochemical engineering,college of chemistry and Chemical engineering,Xiamen {2.,Xiamen 3.1005,PR{3.) c({12. engineering laboratory for {13. Chemical Productions of Alcohols,Ethers and Esters,Xiamen {2.,Xiamen 3.1005,PR{3.) d(Key Lab for Chemical Biology of Fujian Province,Xiamen {2.,Xiamen 3.1005,PR{3.)

Size control biosynthesis of silver nanoparticles(AgNPs) by continuous-flow process in microreactors with different types was demonstrated in this *** Platycladi(***) extract is served as both reducing and capping *** effect of volumetric flow rate,concentration of *** extract,interface of different materials and different diameter of *** the completion of nucleation and the particle growth dynamics(size) were *** of AgNPs were examined by UV-Visible Spectroscopy,transmission electron microscopy(TEM),X-ray diffraction(XRD),and energy dispersive X-ray(EDX) *** was found that two distinguished particle size distribution are formation(several nm and dozens of nm) in the process of continuous flow synthesis when the biomass was abundant.

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A simple green approach to synthesis of sub-100 nm carbon spheres as template for TiO_2.hollow nanospheres with enhanced photocatalytic activities

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Science china Materials 2018年第6期61卷 869-877页

作者： Yubo Tan1 Maochang Liu1 Daixing Wei1 Heming Tang2.Xinjian Feng2.Shaohua Shen1 International Research center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University college of chemistry Chemical Engineering and Materials Science Soochow University

Carbon spheres（CSs） have attracted great attention given their wide applications in bio-diagnostics, photonic band-gap crystals and drug delivery, etc. The morphology and size of CSs greatly affect their performances and applications. Herein, we report a green and catalyst-free hydrothermal carbonization（HTC） method to synthesize CSs with glucose as carbon precursor. The diameter of CSs can be tuned within a wide range from 450 to 40 nm by controlling the glucose concentration, reaction time and *** the obtained CSs as template, hollow TiO2.nanospheres（HTNSs） with controllable diameters are prepared via a sol-gel method. As photocatalysts for hydrogen generation, the photoactivity of the HTNSs shows strong dependence upon size,and is much higher than that of solid TiO2. With particle size decreasing, the photoactivity of the obtained HTNSs gradually increases. Without any co-catalyst, the highest photocatalytic hydrogen generation activity is obtained with HTNSs of 40 nm in diameter, which exceeds that of solid TiO2.and commercial P2. by 64 times and 3.times, respectively.

关键词： carbon nanospheres hydrothermal carbonization hollow titanium dioxide nanospheres photocatalytic hydrogen production

Microwave absorption of aluminum/hydrogen treated titanium dioxide nanoparticles

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Journal of Materiomics 2019年第1期5卷 133-146页

作者： Michael green Peng Xiang Zhanqiang Liu James Murowchick Xinyu Tan Fuqiang Huang Xiaobo Chen Department of chemistry University of MissourieKansas CityKansas CityMO64110USA college of Materials and Chemical engineering Hubei Provincial Collaborative Innovation Center for New Energy MicrogridChina Three Gorges UniversityYichang443002China State Key laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai200050China Department of Geosciences University of MissourieKansas CityKansas CityMO64110USA State Key laboratory of Rare Earth Materials chemistry and Applications College of Chemistry and Molecular EngineeringPeking UniversityBeijing100871China

Interactions between incident electromagnetic energy and matter are of critical importance for numerous civil and military applications such as photocatalysis,solar cells,optics,radar detection,communications,information processing and transport et *** mechanisms for such interactions in the microwave frequency mainly rely on dipole rotations and magnetic domain *** this study,we present the first report of the microwave absorption of Al/H2.treated TiO_(2. nanoparticles,where the A_(l)/H_(2. treatment not only induces structural and optical property changes,but also largely improves the microwave absorption performance of TiO_(2. ***,the frequency of the microwave absorption can be finely controlled with the treatment temperature,and the absorption efficiency can reach optimal values with a careful temperature tuning.A large reflection loss of58.02.dB has been demonstrated with 3.1mm TiO_(2. coating when the treating temperature is 700℃.The high efficiency of microwave absorption is most likely linked to the disordering-induced property changes in the *** with the increased microwave absorption properties are largely increased visiblelight and IR absorptions,and enhanced electrical conductivity and reduced skin-depth,which is likely related to the interfacial defects within the TiO_(2. nanoparticles caused by the Al/H2.treatment.

关键词： Microwave absorption Black TiO_(2.nanoparticles Hydrogenation Aluminum reduction