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Solid Superacid Catalyzed Efficient Synthesis of 2-Diethylaminoethyl Aryloxyacetates

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Chinese Chemical Letters 2005年第2期16卷 197-200页

作者： MingDeCHEN AnQiCHEN MinLIN ZhaoYingLI JinCHEN DepartmentofChemistry XiamenUniversity＆theKeyLaboratoryforChemicalBiologyofFujianProvinceXiamen361005

Diethylaminoethyl aryloxyacetates are prepared efficiently in 75~95% yields bycondensation of the corresponding aryloxyacetic acids with 2-diethylaminoethanol in the presenceof catalytic amount of solid superacid SO4 ... 详细信息

关键词： Solid superacid esterification diethylaminoethyl aryloxyacetate catalyst.

MAGNETIC POLYMER MICROSPHERE STABILIZED GOLD NANOCOLLOIDS AS A FACILELY RECOVERABLE catalyst

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Chinese Journal of Polymer Science 2011年第3期29卷 342-351页

作者：杨新林 Key Laboratory of Functional Polymer Materials the Ministry of EducationInstitute of Polymer Chemistry Nankai University

Magnetically responsive hierarchical magnetite/silica/poly（ethyleneglycol dimethacrylate-co-4-vinylpyridine）（Fe3O4/SiO2/P（EGDMA-co-VPy）） tri-layer microspheres were used as stabilizers for gold metallic nanoeolloids as a facilely recoverable catalyst.with the reduction of 4-nitrophenol to 4-aminophenol as a model reaction. The magnetic microsphere stabilized gold metallic nanocolloids were prepared by in situ reduction of gold chloride trihydrate with borohydride as reductant via the stabilization effect of the pyridyl groups to gold nanoparticles on the surface of the outer shell-layer of the inorganic/polymer tri-layer microspheres.

关键词： Gold metallic nanocolloids Magnetic functional polymer microspheres catalyst.

Active site of praseodymium orthovanadate catalyst.in oxidative dehydrogenation of propane

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Chinese Science Bulletin 1998年第3期43卷 217-220页

作者： Weide Zhang Chaktong Au Huilin Wan Xiamen Univ Dept Chem Xiamen 361005 Peoples R China Xiamen Univ State Key Lab Phys Chem Solid Surface Xiamen 361005 Peoples R China Hong Kong Baptist Univ Dept Chem Hong Kong Hong Kong

The pure phase of praseodymium orthovanadate (PrVO\-4) has been prepared by the citrate method. The active site of PrVO\-4 was studied by ESR, NO_TPD, O\-2_TPD and 18 O\-2_isotope exchange methods. The results of ESR and NO_TPD confirmed the presence of V 4+ in the catalyst. 18 O\-2_isotope exchange was through a single exchange procedure. From the result of O\-2+TPD and the kinetic study of 18 O\-2_isotope exchange, one can reach a conclusion that the V 4+ species associated with oxygen vacancies are the site for O\-2 activation. The adsorbed O\-2 or O\+- are the active oxygen species in propane oxidative dehydrogenation.

关键词： praseodymium orthovanadate active site propane oxidative dehydrogenation catalyst.

Effects of iron phthalocyanine on the inner pressure of MH/Ni battery

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Science China Chemistry 2004年第3期47卷 235-239页

作者： WANG Fang WU Feng Beijing Institute of Technology National Development Center of Hi-Tech Green Materials Beijing 100081 China Beijing Institute of Technology National Development Center of Hi-Tech Green Materials Beijing 100081 China

Effects of iron phthalocyanine (FePc) on the inner pressure of MH/Ni batteries dur-ing charging were examined. Experimental results show that the battery with appropriate quantity of FePc displays a much lower inner pressure under charging and overcharging than the battery without FePc, especially the battery with 1 mg FePc exhibits the slowest increasing speed of inner pressure and the best charging efficiency and overchargeability.

关键词： inner pressure, MH/Ni batteries, iron phthalocyanine, hydrogen storage alloy, electrochemical catalyst.

Investigation on Interaction between Cold Plasma with catalyst.

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Chinese Chemical Letters 2003年第3期14卷 316-318页

作者： Bao Wei WANG Gen Hui XU State Key Laboratory of C1 Chemical Technology Tianjin UniversityTianjin 300072 School of Material Science and Engineering Tianjin UniversityTianjin 300072

The characteristic parameters were measured with floating double probe method when cold plasma was interacting with catalyst., such as MoO3/Al2O3, NiY, Pd/Al2O3, which were used in the conversion of natural gas to C2 hydrocarbons through electrical field enhanced plasma catalysis. These parameters were compared in different input voltage, different atmosphere, before and after reaction in plasma field. The interaction between catalyst. and cold plasma was also investigated. This confirm that cold plasma can enhanced catalysis effect.

关键词： Cold plasma floating double probe catalyst.

Stereochemical control in propylene polymerization with asymmetrically substituted titanocene/methylaluminoxane catalyst

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Science China Chemistry 1995年第9期38卷 1068-1074页

作者：田军胡宁海沈琪黄葆同 Changchun Institute of Applied Chemistry Chinese Academy of SciencesChangchun 130022China

A new mono-substituted titanocene,（η5-cyclopentadienyl）[η5-（1-（4-methoxyphenyl）cyclohexyl）cyclopentadienyl]dichlorotitanium（I）,has been prepared via a novel modified synthesis,and its X-raycrystal structure has been determined.It crystallizes in the orthorhombic space group P212121 with cell constantsa=0.9680（5）nm,b=1.2846（5）nm,c=1.6944（6）nm,Z=4,R=0.066.The I/methylaluminoxane（MAO）catalyst.ystem produces at different polymerization temperatures either an isotactic or a syndiotactic polypropylene,both of which have the combined influence of enantiomorphic-site control and chain-end control,or an atacticpolypropylene controlled by Bernoallian propagation mechanism.

关键词： stereochemistry propylene polymerization mono-substituted titanocene methylaluminoxane Ziegler-Natta catalyst.

Metallization of bacteria cells

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中国科学：技术科学英文版 2003年第2期46卷 161-167页

作者：黎向锋李雅芹蔡军张德远 Department of Mechanical Engineering and Automation Beijing University of Aeronautics and Astronautics Institute of Microbiology Chinese Academy of Sciences

Bacteria cells with different standard shapes are well suited for use as templates for the fabrication of magnetic and electrically conductive microstructures. In this paper, metallization of bacteria cells is demonstrated by an electroless deposition technique of nickel-phosphorus initiated by colloid palladium-tin catalyst.on the surfaces of Citeromyces matritensis and Bacillus cereus. The activated and metallized bacteria cells have been characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction analysis (XRD). Results showed that both Citeromyces matritensis and Bacillus cereus had no deformation in shape after metallization; the metallized films deposited on the surfaces of bacteria cells are homogeneous in thickness and noncrystalline in phase structure. The kinetics of colloid palladium-tin solution and electroless plating on bacteria cells is discussed.

关键词： biomaching, biolimited forming technology, metallization of bacteria cells, electroless deposition of NiP, colloidal Pd-Sn catalyst.

Iodine-catalyzed Synthesis of α-Amino Phosphonates

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Chinese Chemical Letters 2006年第6期17卷 733-735页

作者： Li Ting DONG Yun Cheng LI Ming YAN Department of Chemistry Suzhou University Suzhou 215006 School of Pharmaceutical Sciences Sun Yat-sen University Guangzhou 510080

Iodine was found to be an efficient catalyst.for the one pot synthesis of α-amino phosphonate from aldehydes, anilines and diethyl phosphite. The influences of the iodine loading, reaction solvent, the structure of a... 详细信息

关键词： Iodine α-amino phosphonate synthesis catalyst.

Substitution reaction of dicyandiamide in the presence of phase transfer catalyst

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Chinese Science Bulletin 1996年第15期41卷 1263-1265页

作者：周景尧姚旭波贾瑜李妙葵 Department of Chemistry Fudan University Shanghai 200433 China

Dicyandiamide (cyanoguanidine) is widely used in the syntheses of melamine and medicines such as barbiturates and guanidine derivatives. However, the substitution reaction of dicyandiamide, particularly the tetra substitution reaction, has not been reported so far. We report here the substitution reaction of dicyandiamide in the presence of phase transfer catalyst.

关键词： dicyandiamide substitution reaction phase transfer catalyst.