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Degradation of lignite model compounds by the action of white rot fungi

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Mining Science and technology 2010年第1期20卷 76-81页

作者： DU Ying, TAO Xiuxiang, SHI Kaiyi, LI Yang school of chemical engineering and technology, China University of Mining & technology, Xuzhou 221000, China school of chemical engineering and technology China University of Mining & Technology Xuzhou 221000 China

Three compounds modeled on the lignite structure were chosen for experimental degradation by different fungi strains. Culture conditions and extracellular enzyme activities were optimized. The growth curves of the strains were determined to study mycelium dry weight and protein content changes. Gas chromatography and infrared spectroscopy were used to detect changes of functional groups before and after the action of the fungi on the model compounds. Possible decomposition products and degrada-tion mechanisms were proposed. The research findings show that C. Versicolor and Golden Mushroom can grow in presence of the model compounds. The optimum culture conditions were a pH of 6.0, a carbon-nitrogen ratio of five and a Tween-80 concentration of 0.1%. Newly produced substances were found by gas chromatography. Infrared analysis showed that the model compounds degraded under the action of the microorganisms.

关键词： coal biotransformation white rot fungi mechanism model compound

XPS Study of the Oxygen on A_2BO_4-type Compounds-A New Discovery of O_(1S) Peaks

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Chinese chemical Letters 1999年第12期10卷 0-0页

作者： Zhi MA Yong Ning QIN Xiao Zhou QI Fei HE(school of chemical engineering and technology, Tianjin University, Tianjin 300072) Sch. of Chem. Eng. and technology Tianjin University Tianjin 300072 China

By means of XPS, a new O1s peak which reflects the lattice oxygen on A_2BO_4-typecompounds is discovered, suggesting that the lattice oxygen might have two energy states on thistype of material.

关键词： XPS lattice oxygen A_2BO_4-type compound.

SYNTHESIS OF DIPEPTIDE THROUGH A TWO-LIQUID-PHASE ENZYME MEMBANE REACTOR

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化工学报 2000年第S1期51卷 25-28页

作者： Jiang Zhongyi (school of chemical of engineering and technology, Tianjin University, Tianjin 300072.China)

The synthesis of dipeptide AcPheLeuNH2 catalyzed by immobilized pancreatic lipase was carried out in a two- liquid-phase hollow-fiber membrane reactor, operated in a batch mode. Kinetic properties of free and immobilized enzyme, partition behavior between aqueous buffer phase and organic solvent phase, and effective diffusion coefficients of substrates and products through the membrane were investigated respectively. Based on the preliminary experimental results, the performance of the enzyme membrane reactor, which is evaluated by the purity and the yield, is discussed.

关键词： two-liquid-phase enzyme reactor dipeptide synthesis

Clustering behavior of solid particles in two-dimensional liquid-solid fluidized-beds

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Particuology 2007年第5期5卷 305-311页

作者： Xiaodong Ana, Mingyan Liua,b,, Yunguan Fua a school of chemical engineering and technology, Tianjin University, Tianjin 300072, China b State Key Laboratory of chemical engineering, Tianjin University, Tianjin 300072, China school of chemical engineering and technology Tianjin University Tianjin 300072 China State Key Laboratory of chemical engineering Tianjin University Tianjin 300072 China

In this paper, the clustering behavior of solid particles in a two-dimensional (2D) liquid-solid fluidized-bed was studied by using the charge coupled devices (CCD) imaging measuring and processing technique and was characterized by fractal analysis. CCD images show that the distribution of solid particles in the 2D liquid-solid fluidised-bed is not uniform and self-organization behavior of solid particles was observed under the present experimental conditions. The solid particles move up in the 2D fluidized-bed in groups or clusters whose configurations are often in the form of horizontal strands. The box fractal dimension of the cluster images in the 2D liquid-solid fluidized-bed increases with the rising of solid holdup and reduces with the increment of solid particle diameter and superficial liquid velocity. At given solid holdup and solid particle size, the lighter particles show smaller fractal dimensions.

关键词： CCD Liquid–solid ?uidized-bed Fractal dimension Cluster Self-organization structure

X-ray and Magnetoresistance Measurements of Electrodeposited Cu-Co Granular Films

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Journal of Materials Science & technology 2005年第3期21卷 307-310页

作者： Suwei YAO, Haixia WU, Weiguo ZHANG and Hongzhi WANG Sugiyama Laboratory of Surface technology, Department of Applied Chemistry, school of chemical engineering and technology, Tianjin University, Tianjin 300072, China Department of Applied Chemistry School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China

Granular CoxCu1-x alloy films were prepared by electrodeposition at room temperature directly onto semiconducting Si substrate. X-ray diffraction (XRD) revealed that the as-deposited films formed single phase metastable fcc alloy structure. The fcc lattice parameter α was found to decrease linearly with increasing Co concentration x in the studied range. The giant magnetoresistance (GMR) of the films was improved after annealing. Pure Co fcc diffraction peaks were observed in the diffractogram of the annealed sample, indicating phase separation occurred upon annealing. The optimal annealing temperature was 450℃. The maximum of magnetoresistance (MR) ratio 8.21% was obtained for the Co20Cu80 thin film after annealing at 450℃ for 1 h. The saturation field decreased upon annealing in the MR curves of Co20Cu80 film.

关键词： Electrodeposition Giant magnetoresistance (GMR) Granular Phase separation

Rapid Syntheses of Benzyl Acetate Under Microwave Irradiation

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chemical Research in Chinese Universities 1994年第2期10卷 159-162页

作者： JIANG Yu-Iin YUAN Yun-cheng and SUN Yue-hua (school of chemical engineering, Dalian University of technology, Dalian, 116012)

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ＲａｐｉｄＳｙｎｔｈｅｓｅｓｏｆＢｅｎｚｙｌＡｃｅｔａｔｅＵｎｄｅｒＭｉｃｒｏｗａｖｅＩｒｒａｄｉａｔｉｏｎＪＩＡＮＧＹｕ－Ｉｉｎ；ＹＵＡＮＹｕｎ－ｃｈｅｎｇ；ａｎｄＳＵＮＹｕｅ－ｈｕａ（ＳｃｈｏｏｌｏｆＣｈｅｍｉｃａｌＥｎｇｉｎｅｅｒｉｎｇ，Ｄａｌ...

关键词： Benzyl acetate Rapid syntheses Microwave irradiation Phase trans-fer catalyst

Partial hydrogenation of adiponitrile to 6-aminocapronitrile over Ni/α-Al_2O_3 catalyst promoted with K_2O and La_2O_3

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Chinese chemical Letters 2007年第6期18卷 685-688页

作者： Lei Zhao, Cai Yun Wang, Ji Xiang Chen , Ji Yan Zhang Department of Catalysis Science and engineering, school of chemical engineering and technology, Tianjin University, Tianjin 300072, China Department of Catalysis Science and engineering School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China

A novel K2O and La2O3 promoted nickel catalyst supported on a-Al2O3 was prepared by co-impregnation method, and it exhibited higher activity and 6-aminocapronitrile selectivity than Ni/a-Al2O3 during the hydrogenation of adiponitrile in the absence of ammonia, i.e., K2O and La2O3 improved the performance of the nickel-based catalyst.

关键词： Nickel catalyst Potassium oxide Lanthana Partial hydrogenation Adiponitrile 6-Aminocapronitrile

A simulation of citrus oil adsorption separation in the supercritical carbon dioxide

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化工进展 2011年第S2期30卷 36-40页

作者： HU Zhihui,ZHANG Donghui,WANG Jixiao (chemical engineering Research Center,State key laboratory of chemical engineering,school of chemical engineering and technology,Tianjin University,Tianjin 300072,China)

Aspen Adsim was used to simulate the fractionation of citrus oil with extraction and adsorption combined method in supercritical carbon *** dynamic behavior in a isothemal and adiabatic bed could be described succesfully,and the simulation results agreed with the experimental *** effect of adsorption time,the flow rate of feed on the concentration of components in product and the recovery were *** amount of loading composition on the adsorbents changed with adsorption time and axial distance of bed was also investigated.

关键词： Supercritical fluid adsorption carbon dioxide citrus oil Aspen Adsim

Ag-ZSM-5 Catalyst for the Catalytic Decomposition of NO

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Chinese chemical Letters 1999年第1期10卷 83-86页

作者： Jia Wei TENG Tian Xi CAI Xin He BAO(school of chemical engineering, Dalian University of technology, Dalian 116012)(State key Laboratory of Catalysis, Dalian Institute of chemical Physics. Dalian 116023) school of chemical engineering Dalian University of Technology Dalian 116012 China State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Dalian 116023 China

The catalytic decomposition of NO over Ag-ZSM-5 catalyst prepared by ion-exchange was investigated. The exchanged silver in the zeolite was reduced and it collected in the course of the reaction to form silver particles of about 20 nm. The catalytic reaction induced a pronounced restructuring of the Ag particles through preferential formation of the (111) facets. These facets were shown to hind a tightly bound oxygen species (O-gamma). The O-gamma species occupies the active sites for NO adsorption resulting in catalyst deactivation. It could be removed by appropriate reducing agents, such as CO, to recover the active sites at elevated temperatures.

关键词： Ag-ZSM-5 catalyst NO decomposition