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Synthesis of nano onion-like fullerenes by using Fe/Al_2O_3 as catalyst by chemical vapor deposition

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Chinese Science Bulletin 2009年第1期54卷 137-141页

作者： LIU XuGuang1,2,WANG CunJing1,2,YANG YongZhen1,3,GUO XingMei1,2,WEN HaiRong1,2 & XU BingShe1,3 1 Key Laboratory of Interface Science and engineering in Advanced Materials,Ministry of Education,taiyuan university of Tech-nology,taiyuan 03002.,china 2.college of chemistry and chemical engineering,taiyuan university of technology,taiyuan 03002.,china 3 college of Materials Science and engineering,taiyuan university of technology,taiyuan 03002.,china Key Laboratory of Interface Science and engineering in Advanced Materials Ministry of Education Taiyuan University of Technology Taiyuan China college of chemistry and chemical engineering Taiyuan University of Technology Taiyuan China college of Materials Science and engineering Taiyuan University of Technology Taiyuan China

Nano-carbon materials were synthesized by the catalytic decomposition of acetylene at 400℃ by using Fe/Al2O3 as catalyst. The product was refluxed in 36% concentrated HCl at 60℃ for 48 h in order to re-move the catalyst support. The samples were examined by scanning and high resolution transmission electron microscopy,energy dispersive spectroscopy and X-ray diffraction. The results show that nano onion-like fullerenes encapsulating a Fe3C core were obtained. These had a structure of stacked graphitic fragments,with diameters ranging from 15―50 nm. When the product was further heat-treated at 1100℃ for 2 h,nano onion-like fullerenes with a clear concentric graphitic layer structure were obtained. The growth mechanism of nano onion-like fullerenes encapsulating metal cores is suggested to follow a vapor-solid growth model.

关键词：纳米碳材料化学蒸发沉积作用合成增长机制

Solvothermal synthesis and ferromagnetic property of bamboo-shoot-like oriented carbon micromaterials

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Chinese Science Bulletin 2010年第33期55卷 3838-3841页

作者： YANG YongZhen1,2,LIU XuGuang1,3,REN WenFang1,3,QIU Li1,3 & XU BingShe1,2 1Key Laboratory of Interface Science and engineering in Advanced Materials(taiyuan university of technology),Ministry of Education,taiyuan 03002.,china 2college of Materials Science and engineering,taiyuan university of technology,taiyuan 03002.,china 3college of chemistry and chemical engineering,taiyuan university of technology,taiyuan 03002.,china Ministry of Education Key Laboratory of Interface Science and Engineering in Advanced Materials (Taiyuan University of Technology) Taiyuan China college of Materials Science and engineering Taiyuan University of Technology Taiyuan China college of chemistry and chemical engineering Taiyuan University of Technology Taiyuan China

Bamboo-shoot-like oriented carbon micromaterials(BOCMs)were synthesized by a solvothermal method at 450°C for 4 h using deoiled asphalt(DOA)as carbon source,toluene as solvent,ferrocene as catalyst precursor and amphiphilic triblock copolymer P123 as *** morphology and structure of the products were characterized by X-ray diffraction,field emission scanning electron microscopy,high resolution transmission electron microscopy and Fourier transform infrared *** results reveal that the obtained products have good distribution with uniform diameters of about 0.5 ?m and the lengths of 1-1.5 μm,and hydrogen-carbon bonds are observed on the surface of *** growth mechanism of BOCMs is discussed,in which that the catalysis of ferrocene and the dispersion and assembly of the aromatic molecules of DOA directed by P123 are critical to the formation of the *** coercivity value(231.91 Oe)from the measurement of a vibrating sample magnetometer shows that the BOCMs have an obvious ferromagnetic behavior.

关键词：溶剂热合成铁磁性碳源场发射扫描电子显微镜高分辨透射电子显微镜傅里叶变换红外光谱两亲嵌段共聚物振动样品磁强计

V_2O_5/C catalyst for liquid phase oxidation of glyoxal to glyoxylic acid

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Science china chemistry 2009年第7期52卷 1057-1062页

作者： NIU YuLan1,2 & LI RuiFeng1 1 Key Laboratory of Coal Science and technology, Ministry of Education, Institute of Special chemicals, taiyuan university of technology, taiyuan 03002., china 2 Department of chemical engineering, taiyuan Institute of technology, taiyuan 030008, china Key Laboratory of Coal Science and technology Ministry of Education Institute of Special Chemicals Taiyuan University of Technology Taiyuan China Department of chemical engineering Taiyuan Institute of Technology Taiyuan China

A study of the catalytic activity of V2O5/C catalyst for the oxygen oxidation of glyoxal has been made, showing that glyoxylic acid can be formed without control of pH value and there is little oxalic acid from the excessive oxidation of glyoxylic acid. The studies of XRD and TEM have shown that V2O5 diffraction peaks gradually strengthen with the increase of the content of V2O5. With the content of 3% V2O5 and the calcination temperature of 573 K, V2O5/C catalyst displayed the best activity and selectivity. The conversion of glyoxal and the selectivity of glyoxylic acid reached 18.76% and 77.70% after 5 h, respectively. Moreover, V2O5/C catalyst showed small deactivation after recycling three times, which indicates that V2O5/C has a higher stability than noble metal catalysts in the reaction medium.

关键词： glyoxal glyoxylic acid V2O5/C catalyst

Effects of lanthanum on calcium-activated K^+ currents and its kinetics in MC3T3 cells

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Science china chemistry 2010年第6期53卷 1281-1286页

作者： ZHANG LiPing1,2 & YANG Pin1 1Key Laboratory of chemical Biology and Molecular engineering of Ministry of Education Institute of Molecular Science,Shanxi university,taiyuan 030006,china 2college of Environment and Safety,taiyuan university of Science and technology,taiyuan 03002.,china Key Laboratory of chemical Biology and Molecular engineering of Ministry of Education Institute of Molecular Science Shanxi University Taiyuan China college of Environment and Safety Taiyuan University of Science and Technology Taiyuan China

Using the whole cell patch-clamp technique,we studied the effects of La3+ on calcium-activated K+ currents and its kinetics of activation and inactivation in non-excitable MC3T3 *** results showed that the calcium-activated outward K+ currents were promoted with increasing concentration of Ca2+ in the pipette solution and a voltage- and Ca2+-dependent ***3+ in the bath solution inhibited the currents in a concentration-dependent manner and the inhibition EC50 was 8.23 ± 1.45 μmol/*** the concentration of 50 μmol/L,La3+ significantly changed the Vh of the activation curve and shifted the activation curve to more positive potentials,but shifted the inactivation curve to more negative *** had no effect on the slope factor k of the activation and inactivation *** currents inhibition could induce a series of physiological and molecular biological functions,presumably because of its ability to depolarize the plasma membrane and enhance cell excitability,resulting in increasing Ca2+ influx and cytoplast Ca2+ *** process may be one of the molecular mechanisms by which La3+ affects the cell growth and function of MC3T3 cells.

关键词： MC3T3 cell potassium ion channel La3+ patch-clamp technique

Preparation,Characterization and Application of ZnAlLa-Hydrotalcite-Like Compounds

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Journal of Natural Gas chemistry 2003年第4期12卷 259-263页

作者： Xianmei Xie, Xia An, Xiulan Wang , Zhizhong Wangcollege of chemical engineering and technology, taiyuan university of technology, taiyuan 03002., china Coll. of Chem. Eng. and technology Taiyuan University of Technology Taiyuan 030024 China

The preparation of ZnAlLa-hydrotalcite-like compounds [ZnAlLa-HTLcs] wasstudied. ZnAlLa-HTLcs were synthesized by a method of variable pH with the raw materials ofZn(NO_3)_2, Al(NO_3)_3, La(NO_3)_3, and NaOH. The eS'ccts of some factors (i.e. pH values, the moleratio of Al^(3+) to La^(3+), temperature and the period of hydrothermal treatment) on thepreparation of HTLcs were discussed systematically. XRD, TG-DTA, FT-IR spectroscopy, and ICP wereperformed to characterize ZnAlLa-HTLcs samples, and the thermal stability of HTLcs was alsodiscussed. It was shown that unique ZnAlLa-HTLcs with high crystallinity can be prepared, under theconditions of pH = 5.5-6.5, n(Zn^(2+))/n(Al^(3+) + La^(3+))=2 and the atomic ratio of La^(3+) toAl^(3+) ranging from 0.07 to 2, hydrothermal treatment at 120 ℃ for 5 h. When the calcination ofthe HTLcs is performed at temperatures above 200 ℃, ZnO phase is detected with Al_2O_3 and La_2O_3spreading on its top. The complex metal oxides derived from ZnAlLa-HTLcs at 500 ℃ have highercatalytic activity and selectivity than those from ZnAl-HTLcs for the esterification of acetic acidwith n-butanol under the same reaction conditions.

关键词： layered compound double hydroxide anionic clay hydrotalcite ZnAlLa preparation characterization application

Hydroisomerization of n-heptane over bimetal-bearing H_3PW_(12)O_(40) catalysts supported on dealuminated USY zeolite

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Science china chemistry 2008年第2期51卷 120-127页

作者： WEI RuiPing1,2, GU YanBo1 & WANG Jun1 1 State Key Laboratory of Materials-Oriented chemical engineering, college of chemistry and chemical engineering, Nanjing Uni- versity of technology, Nanjing 210009, china 2.college of chemistry and chemical engineering, Southeast university, Nanjing 211189, china State Key Laboratory of Materials-Oriented chemical engineering College of Chemistry and Chemical Engineering Nanjing University of Technology Nanjing China college of chemistry and chemical engineering Southeast University Nanjing China

The bimetal-bearing (CePt or LaPt) 12-tungstophosphoric acid (H3PW12O40 (PW)) catalysts supported on dealuminated USY zeolite (DUSY) were prepared by impregnation and characterized by XRD, BET, IR, and H2-chemisorption. Their catalytic activities were tested in the hydroisomerization of n-heptane with a continuous atmospheric fixed-bed reactor. After the steam treatment combined with the acid leaching, as well as the supporting with PW and the bimetals, the DUSY support retains the Y zeolite porosity and the PW well keeps its Keggin structure in catalysts. The doping of Ce into the catalysts enhances the dispersion of Pt on the catalyst surface. The Pt-bearing PW catalysts doped with Ce or La, especially Ce, exhibit much higher catalytic activity and selectivity than the catalysts without dopants at lowered reaction temperatures. At the optimal reaction conditions, i.e., the reaction temperature of 250℃ and WHSV of 1.4 h1, the catalyst with a Pt loading of 0.4%, PW loading of 10% and a molar ratio of Ce to Pt of 15:1 shows a conversion of n-heptane of 70.3% with a high selectivity for isomerization products of 94.1%.

关键词： hydroisomerization of n-heptane bimetal catalyst heteropoly acid USY platinum

Simultaneous Removal of COS and H_2S at Low Temperatures over Nanoparticle a-FeOOH Based Catalysts

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Journal of Natural Gas chemistry 2003年第1期12卷 37-42页

作者： Zhihua Gao, Chunhu Li, Kechang XieState Key Lab of C1 chemistry and technology, Institute of Coal chemical engineering, taiyuan university of technology,taiyuan 03002., china Stt. Key Lab of C1 Chem./technology Inst. of Coal Chemical Engineering Taiyuan University of Technology Taiyuan 030024 China

Catalysts using α-FeOOH nanoparticles as the active ingredient were testedby a microreactor-chromatography assessing apparatus at atmospheric pressure between 25 and 60 ℃with a gas hourly space velocity of 10,000 h^(-1), while the removal performance of H_2S withcatalysts was investigated using the thermal gravimetric method. The results show that the catalystsare highly active for COS hydrolysis at low temperatures (≤60 ℃) and high gas hourly spacevelocity, and the highest activity can reach 100%. The catalyst is particularly stable for 12 h, andno deactivation is observed. Nanoparticle α-FeOOH prepared using hydrated iron sulfate showshigher COS hydrolysis activity, and the optimum calcination temperature for the catalyst is 260 ℃.In addition, the catalysts can remove COS and H_2S simultaneously, and 60 ℃ is favorable for theremoval of H_2S. The compensation effect exists in nanoparticle-based catalysts.

关键词： nanoparticle α-FeOOH COS hydrolysis removal of H_2S compensationeffect

Effects of Cu^(2+) on characteristic of SV currents

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Science china chemistry 2006年第6期49卷 560-564页

作者： ZHANG Liping1,2 & YANG Pin1 1. Key Laboratory of chemical Biology and Molecular engineering of Ministry of Education, Institute of Molecular Science, Shanxi university, taiyuan 030006, china 2. Institute of Environment Science, taiyuan university of Science and technology, taiyuan 03002., china Key Laboratory of chemical Biology and Molecular engineering of Ministry of Education Institute of Molecular Science Shanxi University Taiyuan China Institute of Environment Science Taiyuan University of Science and Technology Taiyuan China

Applying the patch-clamp technique to vacuoles from Radish we studied the effects of Cu2+ on Slow Vacuolar (SV) current’s characteristic. Our results show that Cu2+ in bath solution at higher concentration inhibits SV currents and the percentage of inhibition increases with increasing concentration and changes with different voltage. When at lower concentration, Cu2+ significantly promotes the SV currents and the promotion ratio decrease with increasing voltage. At the same time, the time constants of activation become lesser after adding Cu2+. These results show that there may be some Cu2+ binding sites on SV channels and binding to which can change SV current’s characteristic.

关键词： the patch-clamp technique, vacuolar, Cu2+, SV channel.

Microkinetics of H2S Removal by Zinc Oxide in the Presence of Moist Gas Atmosphere

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Journal of Natural Gas chemistry 2003年第1期12卷 43-48页

作者： Hulling Fan, Chunhu Li, Hanxian Guo, Kechang XieState Key Lab of C1 chemistry and technology, Institute for chemical engineering of Coal, taiyuan university of technology, taiyuan 03002., china Stt. Key Lab of C1 Chem./technology Inst. for Chem. Engineering of Coal Taiyuan University of Technology Taiyuan 030024 China

The microkinetics of H_2S removal by ZnO desulfurization in H_2O-CO_2-N_2,H_2O-CO-N_2 and H_2O-O_2-N_2 gas mixtures was studied by thermogravimetric analysis. Experimentswere carried out with 100-120 mesh ZnO powder at temperatures from 473 K to 563 K. The results showthat the kinetic behaviors of desulfurization could all be described by an improved shrinking-coremodel. The activation energies of the reaction and the diffusion in different gas atmosphere's wereestimated.

关键词： kinetics desulfurization improved shrinking-core model H_2S zincoxide