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Change of asphaltene and resin properties after catalytic aquathermolysis

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Petroleum Science 2009年第2期6卷 194-200页

作者： Yi Yufeng Li Shuyuan Ding Fuchen Yu Hang School of chemical Science and engineering China University of Petroleum （Beijing） Beijing 102249 China School of chemical engineering Beijing Institute of Petrol-chemical Technology Beijing 102617 China

Resin and asphaltene were separated from Liaohe heavy oil. Catalytic aquathermolysis of asphaltene and resin was investigated by using water soluble catalysts （NiSO4 and FeSO4） and oil soluble catalysts （nickel naphthenate and iron naphthenate）. Before and after aquathermolysis, the properties of the resin and asphaltene was compared by means of ultimate analysis, vapor pressure osmometer （VPO） average molecular weight, X-ray diffraction （XRD）,^13C and ^1H nuclear magnetic resonance （NMR）. The conversion sequence was as follows： No-catalyst〈NiSO4〈FeSO4〈nickel naphthenate〈iron naphthenate. In the presence of catalysts, the amount of H2 and CO increased significantly, while H2S in the gas product decreased. The molecular weight of asphaltene and resin increased after reaction without catalyst. But the catalysts restrained this trend. The H/C ratio of asphaltene and resin decreased after reaction. From the results of average structural parameters and molecular weight, it was found that asphaltene and resin were partly aggregated after aquathermolysis.

关键词： Asphaltene resin aquathermolysis molecular weight catalyst

Effect of surfactants on the structure and photoelectric properties of ITO films by sol-gel method

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Rare Metals 2010年第2期29卷 143-148页

作者： LIU Jiaxiang, WU Da, zhang Nan, and WANG Yue College of Materials Science and engineering, beijing university of chemical technology, beijing 100029, china College of Materials Science and engineering Beijing University of Chemical Technology

The Indium tin oxide（ITO） thin film possesses excellent photoelectric properties that enable it to act as an ideal transparent *** obtain high-quality ITO films through sol-gel method, the ionic surfactant monoethanolamine and the non-ionic surfactant polyethylene glycol（PEG） were added to the ITO precursor *** influences of surfactants on the structural and photoelectric properties of ITO film samples were *** patterns indicated that surfactant monoethanolamine contributed to film predominant grain orientation along the（400） *** high transmittance（over 95%） was attributed to the preferred orientation and the grain size expansion of ITO *** showed that the surface particle size and the morphology of ITO films were strongly dependent on the kind of surfactants *** to the shortwave region, the absorption edge of the films exhibited the Burstein-Moss shift.

关键词： surfactants indium tin oxide films sol-gel structure photoelectricity

Corrosion Resistance of Single Layer and Multilayer TaN Coatings

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稀有金属材料与工程 2011年第S4期40卷 203-205页

作者： Sun Gang1,Ma Guojia1,2,Liu Xing2,zhang Lin2 1beijing Aeronautical Manufacturing technology Research Institute,beijing 100024,china2Dalian university of technology,Dalian 116024,china beijing Aeronaut Mfg Technol Res Inst Beijing 100024 Peoples R China Dalian Univ Technol Dalian 116024 Peoples R China

In this study,the TaN single and multilayer coatings were deposited on Cr12MoV steel substrates by magnetron sputtering *** phase structure,chemical composition,and morphology of coatings were observed utilizing X-ray diffraction 、atom force microscope and scanning electron *** corrosion behaviors of the coatings were studied in aerated 3.5wt.% NaCl aqueous solutions by interpretation of the electrochemical anodic polarization *** results showed that the single TaN coatings were deteriorated than TaN multilayer *** the effect that the multilayer coating can make some porous in the coatings closed,the structure and morphology are also important reasons which cause the different corrosion resistance ability between them.

关键词： TaN multilayer coatings corrosion behaviors

Biological decomposition of Na_2S_2O_3 into sulfur by a newly isolated facultative thermophilic alkaline desulphuricant strain

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Science china Chemistry 2009年第2期52卷 226-230页

作者： zhang JianBin1,zhang Tong2,MA Kai2,zhang PengYan2,LI Qiang2 & WEI XiongHui1 1 Department of Applied Chemistry,College of Chemistry & Molecular engineering,Peking university,beijing 100190,china 2 College of chemical engineering,Inner Mongolia university of technology,Huhhot 010051,china 1. Department of Applied Chemistry College of Chemistry & Molecular Engineering Peking University Beijing 100190 China 2. College of chemical engineering Inner Mongolia University of Technology Huhhot 010051 China

A facultative thermophilic alkaline desulphuricant strain named GDJ-3 was isolated from neutral soils,enriched on sulfur synthetic medium,and detected in previous *** and chemotax-onomic analyses and 16s RNA gene sequencing showed that the strain was in good agreement with Alpha proteobacterium sp.(97%) and ochrobactrum sp.(98%).The regenerative processes of the solu-tion containing sulfur compounds(SCS) from the strain through an orthogonal test were investigated to get the optimum regenerative *** results showed that regenerative temperature,air flow,and stirring speed of the agitator were the main three variables influencing the regenerative processes of the *** optimum regenerative efficiency of the SCS from the strain was obtained when tem-perature,air flow,and stirring speed of the agitator were 318.2 K,3.0 L/min,and zero r/min,*** this condition,when the cell concentration of the strain was adjusted to 107/mL,the concentra-tions of Na2S2O3 and Na2S in the SCS decreased from 112.68 g/L to 96.88 g/L and from 0.87 g/L to 0.11 g/L in 9.5 ***,XRD spectrum shows that sulfur was formed in the regeneration *** results suggest that the strain has potential application to the regeneration of the industrial so-lution containing sulfur compounds.

关键词： bio-desulfurization thermophiles optimization biocomposition orthogonal test

Depth profiling of SBS/PET layered materials using step-scan phase modulation Fourier transform infrared photoacoustic spectroscopy and two-dimensional correlation analysis

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Science china Chemistry 2010年第5期53卷 1189-1193页

作者： LI BoBin & zhang PuDun State Key Laboratory of chemical Resource engineering beijing university of chemical technology,beijing 100029,china 1. State Key Laboratory of chemical Resource engineering Beijing University of Chemical Technology Beijing 100029 China

This paper demonstrates the application of step-scan phase modulation Fourier transform infrared photoacoustic spectroscopy(FTIR-PAS) in non-destructively depth profiling of styrene-butadiene-styrene block copolymer/polyethylene terephthalate(SBS/PET) layered *** surface thicknesses of three layered samples were determined to be 1.2,4.3 and 9.4μm by using phase difference analysis,overcoming the spatial detection limits of *** with generalized two-dimensional(G2D) FTIR correlation analysis,the spatial origins of peaks in the SBS/PET spectrum are identified with those having overlapping peaks between different layers are resolved.

关键词： depth profiling FTIR photoacoustic step-scan two-dimensional correlation analysis layered materials

Study on the Miscibility and Phase Behavior of Polyoxymethylene with Novolak

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Journal of Materials Science & technology 2000年第4期16卷 427-430页

作者： Xiaodong WANG, Hangquan LI and Riguang JIN (School of Materials Science and engineering, beijing university of chemical technology, beijing 100029, china) School of Materials Science and engineering Beijing University of Chemical Technology Beijing 100029 China

The miscibility and phase behavior of the blends of polyoxymethylene (POM)/Novolak were investigated by the cloud point method, which showed that the POM/Novolak blends exhibited a lower critical solution temperature. The melting point of POM decreased when diluted with Novolak. From the melting temperature depression of POM, a negative interaction parameter (x) between POM and Novolak was obtained. The IR spectrum revealed that the miscibility between POM and Novolak was caused by the specific interaction between the OH groups of Novolak and the ether oxygen atoms of POM. The morphology of the blends investigated by polarized light microscopy showed that the size of spherulites of POM was sharply decreased by its mixing with Novolak. This suggests that Novolak be used as a compatibilizer for POM.

关键词： POM Study on the Miscibility and Phase Behavior of Polyoxymethylene with Novolak

Synthesis and magnetic properties of CdS/α-Fe_2O_3 hierarchical nanostructures

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Science china(Physics,Mechanics & Astronomy) 2009年第7期52卷 997-1002页

作者： CHEN YuJin1,2,3, SHI XiaoLing1, CAO MaoSheng1 & ZHU ChunLing4 1 School of Materials Science and engineering, beijing Institute of technology, beijing 100081, china 2 Micro-Nano Technologies Research Center, Hunan university, Changsha 410082, china 3 College of Science, Harbin engineering university, Harbin 150001, china 4 College of Material Science and chemical engineering, Harbin engineering university, Harbin 150001, china 1. School of Materials Science and engineering Beijing Institute of Technology Beijing 100081 China 2. Micro-Nano Technologies Research Center Hunan University Changsha 410082 China 3. College of Science Harbin Engineering University Harbin 150001 China 4. College of Material Science and chemical engineering Harbin Engineering University Harbin 150001 China

CdS/α-Fe2O3 hierarchical nanostructures, where the CdS nanorods grow irregularly on the side surface of α-Fe2O3 nanorods, were synthesized via a three-step process. The diameters and lengths of CdS nanorods can be tuned by changing the ethylenediamine (EDA) and Cd ion concentrations. The magnetic investigations by superconducting quantum interference device indicate that the hierarchical nanostructures have an Morin transition at lower temperature (230 K) than that of the single bulk α-Fe2O3 materials (263 K). Importantly, the hierarchical nanostructures exhibit weakly ferromagnetic characteristics at 300 K. A sharp peak assigned to the surface trap induced emission are observed in room temperature PL spectra. Combining with the optoelectronic properties of CdS, the CdS/ α-Fe2O3 hierarchical nanostructures may be used as multi-functional materials for optoelectronic and magnetic devices.

关键词： α-Fe2O3 CdS hierarchical nanostructures magnetic properties

Advances in studies of the tribological behavior of molecular deposition films

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Petroleum Science 2008年第4期5卷 379-387页

作者： Xiao Yuqi zhang Siwei Wang Deguo Gao Manglai School of Mechanical and Electronic engineering China University of Petroleum Beijing 102249 China School of chemical Science and engineering China University of Petroleum Beijing 102249 China

An overview of the advances in studies on tribology of molecular deposition （MD） films is presented here to summarize the studies of nanofrictional properties, adhesion, wear and mechanical behavior, as well as the molecular dynamics simulation of nanotribological properties of the film in the last decade. Some key research topics which need to be investigate further are addressed.

关键词： Molecular deposition (MD) film tribological behavior adhesive property wear characteristics mechanical behavior

Heat capacity and thermodynamical properties of the crystal of [RE_2(Glu)_2(H_2O)_8](ClO_4)_4·H_2O (RE = Nd, Eu, Dy)

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Science china Chemistry 2009年第7期52卷 862-867页

作者： WU XinMin1, LI Wei1, TAN ZhiCheng2 & QU SongSheng3 1 Department of chemical engineering, beijing Institute of Petro-chemical technology, beijing 102617, china 2 Thermochemistry Laboratory, Dalian Institute of chemical Physics, Chinese Academy of Sciences, Dalian 116023, china 3 College of Chemistry and Molecular Science, Wuhan university, Wuhan 430072, china Department of chemical engineering Beijing Institute of Petro-chemical Technology Beijing 102617 China Thermochemistry Laboratory Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China College of Chemistry and Molecular Science Wuhan University Wuhan 430072 China

Thermodynamical data of rare earth complexes with amino acid are important for engineering chemistry and fundamental chemistry. However, they have rarely been reported. In this work, a series of crystalline complexes of rare earth perchlorate coordinated with glutamic acid have been synthesized in water medium, and their thermodynamical data, including the heat capacity in low temperature range and the standard enthalpy of formation, were determined. These complexes were identified to be [RE2(Glu)2(H2O)8](ClO4)4·H2O (RE = Nd, Eu, Dy) by using thermogravimetric analysis (TG), differential thermal analysis (DTA), and chemical and elementary analyses. Their purity has been determined. No melting points were observed for all the three complexes. The heat capacity of the complexes was measured by an adiabatic calorimeter from 79 to 370 K. Abnormal heat capacity values were detected for two of the complexes and the decomposition range of one complex was found. The temperature, enthalpy change and entropy change of the decomposition processes of the three complexes were calculated. The polynomial equations of heat capacity in the experimental temperature range have been obtained by least squares fitting. The standard enthalpy of formation was determined by an isoperibol reaction calorimeter at 298.15 K.

关键词： complex of rare earth, [RE2(Glu)2(H2O)8](ClO4)4·H2O (RE = Nd, Eu, Dy Glu = glutamic acid), low-temperature heat capacity, standard enthalpy of formation