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DENG Q.,Key Laboratory of Theoretical Chemistry and Molecular Simulation | LI X.-m.,Key Laboratory of Theoretical Chemistry and Molecular Simulation | LI X.-m.,Valiant Fine Chemicals Co. | PENG Z.-s.,Key Laboratory of Theoretical Chemistry and Molecular Simulation | And 3 more authors.
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2010

Au/γ-Al2O3 catalysts were prepared by deposition-precipitation method for the catalytic combustion of low concentration alcohol streams (methanol, ethanol, iso-propanol and n-propanol). The catalysts were characterized by X-ray photoelectron spectroscopy (XPS), X-ray diffractometry (XRD) and energy dispersive X-ray micro analysis (EDS) techniques. The XPS results showed that there was only Au0 on the surface of catalysts. The XRD patterns showed that Au was presumably highly dispersed over γ-Al2O3. The temperatures for complete conversion of methanol, ethanol, iso-propanol and n-propanol with concentration of 2.0 g/m3 were 60, 155, 170 and 137 ?, respectively, but they were completely mineralized into CO2 and H2O at 60, 220, 260 and 217 ? respectively over the optimized catalyst. The activity of the catalyst was stable in 130 h. The kinetics for the catalytic methanol elimination followed quasi-first order reaction expressed as r=0.652 8c0+0.084 2. The value of apparent activation energy is 54.7 kJ/mol in the range of reaction temperature. © 2010 The Nonferrous Metals Society of China.


Zhao Y.-H.,Hunan University of Science and Technology | Zhao Y.-H.,CAS Shanghai Institute of Organic Chemistry | Ren X.-F.,Hunan University of Science and Technology | Liu H.-W.,Hunan University of Science and Technology | Liu H.-W.,Key Laboratory of Theoretical Chemistry and Molecular Simulation
Synthetic Communications | Year: 2015

(Chemical Equation Presented) The benzofuran skeleton is commonly found in a wide variety of natural products that display a wide range of biological activities. For this reason, benzofuran has a high potential for use as a scaffold in both chemical and pharmaceutical syntheses of natural products. This work describes the development of a novel asymmetric synthetic method of benzofuran-derived β-amino esters via K2CO3-promoted domino reactions of ortho-hydroxyl aromatic N-tert-butylsulfinyl imines and diethyl bromomalonate. A small library of target compounds was prepared under optimized reaction conditions in moderate to good yields with high distereoselective and enantioselective properties. The newly generated chiral carbon center was of an (S)-configuration as determined by x-ray diffraction. 2015 Copyright © Taylor & Francis Group, LLC.


Zhao Y.,Hunan University of Science and Technology | Zhao Y.,CAS Shanghai Institute of Organic Chemistry | Luo M.,Hunan University of Science and Technology | Li Y.,Hunan University of Science and Technology | And 4 more authors.
Chinese Journal of Chemistry | Year: 2016

An operationally simple approach for the tandem synthesis of isoquinolines by the reaction of o-alkynylaldehydes with ammonium bicarbonate via Ag-catalyzed 6-endo-dig ring closure is described. The reaction conditions and the scope of the reaction are examined, and a variety of substituted isoquinolines are prepared in moderate to excellent yields. Copyright © 2016 SIOC, CAS, Shanghai & WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim


Zhao Y.-H.,Hunan University of Science and Technology | Zhao Y.-H.,CAS Shanghai Institute of Organic Chemistry | Luo M.-J.,Hunan University of Science and Technology | Liu H.-W.,Hunan University of Science and Technology | And 2 more authors.
Synthetic Communications | Year: 2015

A small library of isocoumarin derivatives has been synthesized via K2CO3-catalyzed domino reactions of 2-carboxybenzaldehyde and ω-bromoacetophenones under microwave irradiation (MW). This strategy offers a simple, environmentally acceptable route to synthesize isocoumarin derivatives in moderate to excellent yields. All new compounds were characterized by 1H NMR, 13C NMR, infrared, and high-resolution mass spectroscopic techniques. Copyright © Taylor & Francis Group, LLC.


Xu G.-R.,Key Laboratory of Theoretical Chemistry and Molecular Simulation | Xu G.-R.,Hunan University of Science and Technology | Wen Y.,Hunan University of Science and Technology | Min X.-P.,Hunan University of Science and Technology | And 4 more authors.
Electrochimica Acta | Year: 2015

MnO2/3-dimensional porous crack nickel (MnO2/3-DPCNi) electrode has been fabricated via an alloying/dealloying process and an electrochemical oxidation process. The construction of the 3-DPCNi was achieved by means of electrodeposition of Zn-Ni alloy on Ni foam substrate, followed by chemically dealloying process under free corrosion conditions. Scanning electronic microscopy (SEM) and X-ray diffraction (XRD) were used to characterize the morphology and structure of the 3-DPCNi. The electrochemical properties of the MnO2/3-DPCNi electrode were investigated using cyclic voltammetry (CV), galvanostatic charge/discharge (GC/D) and electrochemical impedance spectroscopy (EIS) technique. It is shown that a layer Ni with a cracked network was well coated on the Ni foam substrate. Such porous crack structures of 3-DPCNi not only provided a conductive network to enhance the charge transport and mass transfer in the electrochemical process but also achieved a large MnO2 mass loading capacity of 14.4 mg cm-2, which resulted in a high areal capacitance of 3.18 F cm-2 at a current rate of 0.25 A g-1. A specific capacitance of 682.8 F g-1 was obtained based on the MnO2 mass loading density of 2.5 mg cm-2 at a current rate of 0.25 A g-1. Moreover, the MnO2/3-DPCNi electrode also exhibited a low ions diffusion resistance and a good cycling performance along with 93.3% specific capacitance retained after 1000 cycles. These results demonstrated that the 3-DPCNi was a promising supporting material for energy conversion and storage devices. © 2015 Published by Elsevier Ltd.


Zhu J.,Hunan University of Science and Technology | Liu S.,Hunan University of Science and Technology | Liu S.,Key Laboratory of Theoretical Chemistry and Molecular Simulation | Yu L.,Hunan University of Science and Technology | And 2 more authors.
Advanced Materials Research | Year: 2011

A new ligand, 1,1′-(pyridin-2,6-diyl)bis-3-p-tolylpropane-1,3- dione(H2L), was prepared and its crystal structure displays its enol isomer. The binary complex, Ln2L3 4H2O [Ln = Eu(III) and Tb(III)], were synthesized by the reaction of synthesized ligand (H2L) and Ln(III). With 1,10-phenanthroline (Phen) as the synergistic ligand, the ternary complex, Ln2L3(Phen)2 [Ln = Eu(III) and Tb(III)], were synthesized. The compounds were characterized by 1H-NMR spectroscopy, MS, IR, UV, DTA-TG and fluorescence spectrum. The luminescent properties of the ligand and its complexes were investigated and the results showed that the prepared ligand was a good luminescent compound, all complexes emitted characteristic luminescence of corresponding lanthanide ions and 1,10-phenanthroline as the synergistic ligand can obviously enhance the luminescence of Eu(III) in the ternary complex. © (2011) Trans Tech Publications, Switzerland.

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