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Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing 2013年第1期35卷 85-90页

作者： Ma, Yu-Wen Feng, Ya-Li Li, Hao-Ran School of Civil and Environmental Engineering University of Science and Technology Beijing Beijing 100083 China Key State Laboratory of Biochemical Engineering Institute of Process Engineering Chinese Academy Beijing 100190 China

Magnesium sulfate heptahydrate was made from salt lake magnesium chloride and sulfuric acid, then anhydrous magnesium sulfate was obtained from magnesium sulfate heptahydrate by dehydration, and finally high-purity magnesia was prepared from anhydrous magnesium sulfate by natural gas reduction pyrolysis. The effects of pyrolysis temperature, pyrolysis time, particle size, and gas flow rate on the conversion rate of magnesium sulfate were investigated by single factor experiment. These experimental parameters were optimized by orthogonal experiment. The reduction pyrolysis product was analyzed and characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The optimal experimental parameters are as follows: the pyrolysis temperature is 1000°C, the pyrolysis time is 30 min, the particle size of anhydrous magnesium sulfate is 75 μm, and the flow rate of natural gas is 25 mL·min-1. The pyrolysis temperature is the main factor which influences the conversion rate. Under the optimal condition, the conversion rate of magnesium sulfate reaches 99.27%, and the purity of magnesia is 99.5%. The unimolecular MgO features well-distributed particle size, porous and fluffy surfaces, and high specific surface area.

关键词： Magnesia

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Preparation of calcium oxide from by-product calcium sulfate by solid-state ball milling reaction at ambient temperature

Beijing Keji Daxue Xuebao/Journal of University of Science a...

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Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing 2013年第3期35卷 347-351页

Calcium oxide (CaO) was prepared by directly pyrolyzing the precursor called calcium carbonate (CaCO3), which was synthesized by solid-state ball milling reaction between NH4HCO3 and CaSO4·2H2O, the byproduct generated during the preparation of MnSO4. The effects of NH4HCO3-to- CaSO4·2H2O molar ratio, milling time, and ball-to-feed mass ratio on the conversion of CaSO4-2H2O were investigated respectively. The product was analyzed by X-ray diffraction and chemical analytical method. The reaction mechanism was also discussed. When the NH4HCO3-to-CaSO4-2H2O molar ratio is 3.5:1, the milling time is 40 min, and the ball-to-feed mass ratio is 5:1, the conversion rate of CaSO4-2H2O reaches 99.8%. Calcium oxide, whose purity is 99.2%, can be prepared by pyrolyzing the precursor at 1000°C for 1 h. The effectiveness of the solid-state reaction is improved by refining the reactant size, increasing the contact area, and providing necessary energy during the ball-milling process at ambient temperature.

关键词： Solid state reactions

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Effect of preparation method on halloysite supported cobalt catalysts for Fischer-Tropsch synthesis

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Journal of Natural Gas Chemistry 2012年第4期21卷 426-430页

作者： Sufang Chen Jinlin Li Yuhua Zhang Daohong Zhang Junjiang Zhu School of Chemistry and Chemical Engineering Soochow UniversitySuzhou 215006JiangsuChina Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission&Ministry of Education South-Central University for NationalitiesWuhan 430073HubeiChina Key Laboratory for Green Chemical Process of Ministry of Education School of Chemical Engineering and PharmacyWuhan Institute of TechnologyWuhan 430073HubeiChina

Novel cobalt Fischer-Tropsch synthesis （FTS） catalysts were prepared from natural halloysite nanotubes （HNT） by double-solvent and wet- impregnation methods, and characterized by TEM, XRD, TPR and N2 adsorption-desorption. Comparing with the catalyst prepared by wet- impregnation method, the catalyst prepared by double-solvent method reduces Co3O4 particle migration and agglomeration due to size-induced effect, thus showing higher catalytic activity for Fischer-Tropsch synthesis.

关键词： Fischer-Tropsch synthesis halloysite nanotubes double-solvent method

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In-line measurement apparatus for residence time distribution in twin-screw extruder and its application in polymer processing

In-line measurement apparatus for residence time distributio...

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70th Annual Technical Conference of the Society of Plastics Engineers 2012, ANTEC 2012

作者： Zhang, Cailiang Gu, Xueping Wang, Jiajun Feng, Lianfang Hu, Guohua State Key Laboratory of Chemical Engineering Department of Chemical and Biochemical Engineering Zhejiang University Hangzhou 310027 China Laboratory of Reactions and Process Engineering CNRS-Nancy Université ENSIC-INPL 1 rue Grandville Nancy 54001 France

ISBN: (纸本)9781622760831

Residence time distribution (RTD) in twin-screw extruder is an important parameter for polymer processing. This work developed an improved apparatus for inline measurement of RTD in twin-screw extruder (TSE). The apparatus possessed many important advantages over those reported in the literatures. An important characteristic of the improved apparatus is to provide the possibility of calculating the local RTD because it allowed to simultaneously measuring RTDs at any two different locations of an extruder. Another significant application is to construct emulsification curves of polymer blend process in TSE by combining the concept of compatibilizer-tracer so that makes it possible for selecting most appropriate compatibilizers under real industrial polymer blending conditions as well as scaling up and optimizing blending processes.

关键词： Residence time distribution

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Thermal decomposition kinetics of magnesite from thermogravimetric data

Thermal decomposition kinetics of magnesite from thermogravi...

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作者： Liu, X.W. Feng, Y.L. Li, H.R. Zhang, P. Wang, P. Civil and Environmental Engineering School University of Science and Technology Beijing 100083 China National Key State Laboratory of Biochemical Engineering Institute of Process Engineering Chinese Academy of Science Beijing 100190 China

Thermal decomposition kinetics of magnesite were investigated using non-isothermal TG-DSC technique at heating rate (β) of 15, 20, 25, 35, and 40 K min-1. The method combined Friedman equation and Kissinger equation was applied to calculate the E and lgA values. A new multiple rate iso-temperature method was used to determine the magnesite thermal decomposition mechanism function, based on the assumption of a series of mechanism functions. The mechanism corresponding to this value of F(a), which with high correlation coefficient (r-squared value) of linear regression analysis and the slope was equal to -1.000, was selected. And the Malek method was also used to further study the magnesite decomposition kinetics. The research results showed that the decomposition of magnesite was controlled by three-dimension diffusion;mechanism function was the anti-Jander equation, the apparent activation energy (E), and the pre-exponential term (A) were 156.12 kJ mol-1 and 105.61 s-1, respectively. The kinetic equation was dα dT = 105. 6 1β( - 18777.9/T){3/2(1 + α ) 2/3 [(1 + α)1/3 - 1]- 1}, and the calculated results were in accordance with the experiment. © 2011 Akadémiai Kiadó, Budapest, Hungary.

关键词： Thermolysis

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Shape-dependent photocatalytic activities of bismuth subcarbonate nanostructures

Shape-dependent photocatalytic activities of bismuth subcarb...

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作者： Tang, Jiale Cheng, Gang Zhou, Huamin Yang, Hao Lu, Zhong Chen, Rong Key Laboratory for Green Chemical Process of Ministry of Education School of Chemical Engineering and Pharmacy Wuhan Institute of Technology Xiongchu Avenue Wuhan 430073 China State Key Laboratory of Materials Processing and Die and Mould Technology Huazhong University of Science and Technology Wuhan 430074 China

Different shaped bismuth subcarbonate ((BiO)2CO3) nanostructures including irregular nanoplates, relatively uniform nanoplates and nanocubes were prepared and characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-vis diffuse reflection spectroscopy (DRS) and nitrogen adsorption. The photocatalytic performance of the as-synthesized (BiO)2CO3 nanostructures on the degradation of Rhodamine B (RhB), methyl orange (MO) and methyl blue (MB) were evaluated under UV-vis light irradiation (modeling sunlight). The photocatalysis tests showed that all the different (BiO) 2CO3 nanostructures displayed enhanced photodegradation performance compared with commercial (BiO)2CO3. The irregular (BiO)2CO3 nanoplates exhibited the highest photocatalytic activity on the degradation of different organic dyes. (BiO) 2CO3 nanosturctures exhibited the different capacity to bleach the three organic dyes, which might be attributed to their different molecular structures. This work may provide a potential photocatalyst for the environmental pollutants treatments. Copyright © 2012 American Scientific Publishers. All rights reserved.

关键词： Nanostructures

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Preface

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Catalysis Today 2013年第1期200卷 1-1页

作者： Zhang, Suojiang Ng, Flora T.T. Rogers, Robin D. State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences China Department of Chemical Engineering University of Waterloo Canada Center for Green Manufacturing and Department of Chemistry University of Alabama United States

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Hydrodemetallation (HDM) of nickel-5,10,15,20-tetraphenylporphyrin (Ni-TPP) over NiMo/γ-Al 2 O 3 catalyst prepared by one-pot method with controlled precipitation of the components

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Fuel 2012年 97卷 504-511页

作者： Juanjuan Li Zhiqiang Xia Weikun Lai Jinbao Zheng Binghui Chen Xiaodong Yi Weiping Fang Department of Chemical and Biochemical Engineering College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 PR China State Key Laboratory for Physical Chemistry of the Solid Surfaces Engineering Laboratory for Green Chemical Productions of Alcohols Ethers and Esters College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 PR China

In this work, a series of NiMo/γ-Al 2 O 3 catalysts is prepared by one-pot method with controlled precipitation of AlCl 3 ·6H 2 O, (NH 4 ) 6 Mo 7 O 24 ·4H 2 O and NiCO 3 ·2Ni(OH) 2 ·4H 2 O using urea and ammonium carbonate as additives. The molar ratio of urea to Al varied from 4.1 to 17.2 and the influence of this parameter on the surface and structural properties of the catalysts and HDM activity was studied. HDM of Ni-TPP was carried out in a batch reactor. The catalysts were characterized by BET, XRD, H 2 -TPR, DRS, XPS, EDS, FT-IR, TG–DTA and NH 3 -TPD. The results show that urea employed as additive not only improves the solubility of Mo and Ni salt, but also adjusts the hydroxyl concentration and facilitates the formation of molybdate and polymolybdate. The existence of residual chlorine may improve the dispersion of the particles containing Ni and Mo on the surface of porous Al 2 O 3 , enhance hydrogen spillover and the acidity of the catalyst. HDM activity varied with the amount of urea to a maximum at urea/Al of 12.3 with activity of 98%. The highest activity occurred at this ratio is mainly due to better porosity, well dispersed active particles, increased octahedral molybdenum/nickel oxides and proper acidity.

关键词： One-pot method Urea NiMo/γ-Al 2 O 3 Hydrodemetallation Ni-TPP

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Isolation and Purification of Antibacterial Peptides from Mussel

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Agricultural Biotechnology 2012年第2期1卷 20-23页

作者： Zhe LI Bin ZHANG Ming GU Changhai WANG School of Life Science and Biotechnology Dalian University of Technology Yantai Institute of Coastal Zone Research Chinese Academy of Sciences State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of Sciences Nanjing Agricultural University

[ Objective ] This study aimed to extract antibacterial peptides from mussel. [ Method ] Blue mussels were used as raw materials for direct extraction of antibacterial peptides by using O. 5 % acetic acid, and the antibacterial peptides were isolated and purified by Sephacryl S-100 polyacrylamide gel chromatography. The fractions were collected for measurement of antibacterial activity and minimum inhibitory concentration for a variety of bacterial species by filter paper diffusion assay. Molecular weight of the antibacterial peptides was determined by SDS-PAGE. Variation of antibacterial activity of antibacterial peptides was measured at 100 ~C under conditions of different processing time and different pH. [ Result] The O. 5% acetic acid was used for crude extraction of antibacterial peptides as extrac- tion solution and led to relatively high extraction efficiency. By using Sephacryl S-100, the antibacterial peptides could be purified as a single substance. The isola- ted and purified antibacterial peptides of mussel had relatively strong antibacterial properties with molecular weight of 5 908, showing heat-resistance acid-alkaline resistance. [ Conclusion] This study laid the theoretical foundation for large-scale production of antibacterial peotides.

关键词： Antibacterial peptides Mussel Isolation Purification

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Coagulation of Chitin and Cellulose from 1‐Ethyl‐3‐methylimidazolium Acetate Ionic‐Liquid Solutions Using Carbon Dioxide†

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Angewandte Chemie 2013年第47期125卷

作者： Patrick S. Barber Chris S. Griggs Gabriela Gurau Zhen Liu Shan Li Zengxi Li Xingmei Lu Suojiang Zhang Robin D. Rogers Center for Green Manufacturing and Department of Chemistry The University of Alabama Tuscaloosa AL 35487 (USA) U.S. Army ERDC Environmental Laboratory Vicksburg MS 39180 (USA) College of Chemistry and Chemical Engineering Graduate University of Chinese Academy of Sciences Beijing 100049 (China) State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Graduate University of Chinese Academy of Sciences Beijing 100190 (China)

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