1，2-双(1′-苯基-3′-甲基-5′-氧代吡唑-4′-基)乙二酮-[1，2]与三正辛基氧化膦协同萃取RE(Ⅲ)的性能和机理研究

研究了1，2-双(1′-苯基-3′-甲基-5′-氧代吡唑-4′-基)乙二酮-[1，2](H     

Properties of La0.9Sr0.1MnO3 and tourmaline compound catalytic materials for methane combustion

A novel catalytic material Lao.9Sr0.1MnO3 and tourmaline compound catalytic material was synthesized in the base of traditional catalytic material La0.9Sr0.1MnO3 which exhibited excellent catalytic activity for methane combustion. Different contents of toumaaline were added to give a series ofLa0.9Sr0.1MnO3 and tourmaline catalytic material through a sol-gel method. Samples above were characterized and analyzed by means of X-ray diffraction （XRD）, scanning electron microscopy （SEM）, Brunauer-Emmett-Teller method （BET）, temperaalre programmed reduction （TPR）, catalytic activity test and contact angle test. The as-prepared sample with 2% （m/m） tourmaline showed good homogeneity surface morphology and displayed the optimal catalytic activity. The light-off temperature reduced by 10 ℃ and the T90 decreased by 15 ℃. In addition, the mechanism of the reinforcement of catalytic activity was explored.     

Study on Rare Earth Electrolyte of Ce_(0.9)RE_(0.1)O_(2-δ) (RE=Pr, Nd, Sm, Gd, Dy)

Thesolidelectrolyteisakeycomponentofsolidoxidefuelcell (SOFC) .Dopedceriaisoneofpromis inghigh conductingsolidelectrolyteinSOFC[1,2 ] .Butitiswell knownthatitisdifficulttosinterdopedceriabysolidstatereactioninair .TheCe0 .9RE0 .1O2 -δelectrolytematerialswerepreparedbythesol gelmethod .Thesinteringtemperatureofthesamplescandecreasetoabout 4 0 0K .Theionicconductivityandlinearthermalexpansionpropertiesofsol gelpreparedCe0 .9RE0 .1O2 -δinawidetemperaturerangewerein vestigated .Thepowder…     

Rare Earth Doping Effects on Properties of Ceria-Zirconia Solid Solution

Ce0.6Zr0.3RE0.1O2(RE=Y, La, Pr, Tb)solid solutions were prepared by co-precipitation technique and characterized by a series of methods. XRD and FT-Raman results show that Ce0.6Zr0.3RE0.1O2 has cubic fluorite structure. The different dopant ion radii bring different effect on the cell parameter of Ce0.6Zr0.3RE0.1O2. The X-ray photoelectron spectroscopy (XPS) results show that the binding energy of Ce3d, Zr3d and O1s for Ce0.6Zr0.3RE0.1O2 rises compared with that for Ce0.6Zr0.4O2, indicating that dopant elements change chemistry environment of solid solutions which is available to improve redox performance. Compared with Pd/Ce0.6Zr0.4O2, doping Y and La does not change air/fuel (A/F) characteristic of TWCs, but doping Pr and Tb widens A/F operating window and makes HC, CO and NO have higher conversion. The light-off temperature of Pd/Ce0.6Zr0.3La0.1O2 is corresponding to that of Pd/Ce0.6Zr0.4O2. However, the light-off temperatures of Pd/Ce0.6Zr0.3M0.1O2 (M=Y, Pr, Tb) are lower than that of Pd/Ce0.6Zr0.4O2, which keep much lower after high temperature treatments. Among Pd/Ce0.6Zr0.3RE0.1O2, Pd/Ce0.6Zr0.3Tb0.1O2 represents wider A/F operating window, higher conversion, lower light-off temperature and better high-temperature resistance.     

Preparing of Nano-Sized Power RE2O3(RE = La,Y,Gd) by Pyrolying Precursors

The precursors RE (HSal) 3 ( RE = La, Y, Gd; HSal = C6 H4 (OH) COO) were synthesized by the rheological phase reaction method. The mechanism and products of thermal decomposition of precursors was studied by using TG,DTA, gas chromatography-mass spectrometry (GC-MS). Nano-sized RE2O3 ( RE = La, Y and Gd) power were obtained by thermal decomposition of the precursors in air at 800 ℃. TEM measurement indicates that RE2O3 are spherical particles. The middle level diameter ( d50 ) of the particles are 19.3 ( La2O3 ) , 53.8 ( Y2O3 ) and 28.6 nm( Gd2O3 ) respectively by means of laser particles size analyzer.     

Analysis of Response Surface in the Study of RE(NO_3)_3-HNO_3-P507-Kerosene Extraction System

RE(NO_3)_3-HNO_3-P507-kerosene extraction system(RE=La,Ce,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Er,Tm,Yb,Lu,Y)was studied by the response surface technique.14 models for extracting single rare earth ele-ment in a broad range of acidity and initial rare earth concentration were obtained by using the stepwiseregression method.Three-dimensional display of the response surface of the model of extracting Er~(3 )wasshowed as an example,which reveals clearly the dependence of distribution ratio upon both initial acidity and ini-tial rare earth concentration.     

Synthesis and Characterization of Y0.9-x GdxEu0.1 BO3 Phosphors by Spray Drying Process

Y0.9-xGdxEu0. 1 BO3 phosphors were synthesized by spray drying (SD) method, and the results were compared with those by conventional solid state (SS) and citrate gel (CG) methods. The PL intensity of phosphors increases with the increase of x value in Y0.9-xGdxEu0.1BO3(prepared by SD) due to an energy migration process like Gd^3 - (Gd^3 )nEu^3 occurred in the material. Conlpared with the latter two methods, the phosphor particles prepared by spray drying method have a better morphology, such as homogeneous size (about 1 - 3μm) with spherical shape and smooth surface.Furthermore, the spray drying-derived phosphors have higher photoluminescence (PL) intensity than those by citrate gel method, but still a little lower than those by the solid state method.     

Preparation，Structural Characterization and Thermal Decomposition Mechanism of Rare Earth Salts of 3－Nitro－1，2，4－Triazol－5－One

Ｐｒｅｐａｒａｔｉｏｎ，ＳｔｒｕｃｔｕｒａｌＣｈａｒａｃｔｅｒｉｚａｔｉｏｎａｎｄＴｈｅｒｍａｌＤｅｃｏｍｐｏｓｉｔｉｏｎＭｅｃｈａｎｉｓｍｏｆＲａｒｅＥａｒｔｈＳａｌｔｓｏｆ３－Ｎｉｔｒｏ－１，２，４－Ｔｒｉａｚｏｌ－５－ＯｎｅＺｈａｎｇＴｏｎｇｌ...     

Synthesis and Characterization of Large Surface Area Yttrium Oxide by Precipitation Method

Rareearthoxides(REO)withlargesurfaceareahavehighchemicalreactionactivity ,soitisusedwidelyinthefieldofcatalysis ,SOFC ,advancedce ramicandsoon[1] .Inordertosatisfythedemandofthenewfunctionmaterials ,thepreparationmethodofspecialphysicalpropertyREcompoundneedstobedeveloped .Yttriumoxide ,especiallywithlargesur faceareaisaREOandwidelyusedintheabovefield .Industrially ,yttriumoxideusuallywaspreparedbythermaldecompositionofyttriumoxalateat 80 0～10 0 0℃for 2h .Itssurfaceareaisonly 2～ 4m2 ·…     

Synthesis, Characterization and Vulcanizing Properties of Rare Earth Complexes with 2-Mercaptobenthiazole

2 ｍｅｒｃａｐｔｏｂｅｎｚｏｔｈｉａｚｏｌｅｗａｓｆｉｒｓｔｒｅｐｏｒｔｅｄｂｙＨｏｆｍａｎｎ[1 ] ｉｎ 1 887.Ｉｔｈａｓｂｅｅｎｕｓｅｄａｓａｎａｃｃｅｌｅｒａｔｏｒｉｎｔｈｅｖｕｌｃａｎｉｚａｔｉｏｎｏｆｒｕｂｂｅｒｆｏｒｍａｎｙｙｅａｒｓ .Ｔｏｄａｙｉｔｉｓｓｔｉｌｌｂｅｉｎｇｕｓｅｄａｓａｍａｉｎａｃｉｄｉｃａｃｃｅｌｅｒａｔｏｒｉｎｒｕｂｂｅｒｉｎｄｕｓｔｒｙ .Ｂｕｔｉｔｈａｓｄｉｓａｄｖａｎｔａｇｅｓｏｆｖｕｌｃａｎｉｚａｔｉｏｎｒｅｖｅｒｓｉｏｎａｎｄｅａｓｙｓｃｏｒｃｈ[2 ] ｗｈｅ…     

Rare Earth Elements-Doped LiCoO2 Cathode Material for Lithium-Ion Batteries

Thedevelopmentoflithium ionbatteriesreliesonthesuccessfuldevelopmentoflithiumintercalationandde intercalationcompounds ,whichareusedasthecathodeandanodeactivematerials .Forthecathode ,LiCoO2 ,LiNiO2 andLiMn2 O4 areselectedasthecan didate .Amongthematerials ,thelayeredtransitionmetaloxideofLiCoO2 isregardedasthemostattrac tivecathodematerialforcommerciallithium ionbat terybecauseofitshighspecificcapacity ,highoperat ingcellvoltageandexcellentrechargeability .Recent ly ,moreextensivestudies…     

微波合成固体氧化物燃料电池阴极材料La1-xSrxMnO3的研究

采用微波技术合成了固体氧化物燃料电池阴极材料La1-xSrxMnO3样品，分别选择x=0.1,0.2,0.3,0.4和0.5合成了La0.9Sr0.1MnO3,La0.8Sr0.2Mn3,La0.7Sr0.3MnO3,La0.6Sr0.4MnO3和La0.5Sr0.5MnO3，用X射线衍射分析检测了样品的结构与组成，用电子扫描电镜考查了样品的形貌和粒度，电导率测量结果表明，样品的组成和烧结温度影响电导率。在系列样品中，组成为La0.7Sr0.3MnO3电导率最高；烧结温度1200℃和1300℃相比较，1300℃烧结后样品的电导率大幅度提高。     

Synthesis and photoluminescent properties of doped ternary Eu_(1-x)Ln_x(NPPD)_3·DPQ complexes

Rare earth (RE) ternary complexes of Eu0.5Ln0.5(NPPD)3·(DPQ) (HNPPD=1-(naphthalen-2-yl)-3-phenylpropane-1,3-dione; DPQ= dipyridobenzoquinone) and Eu1-xLax(NPPD)3·(DPQ) (Ln3+=La3+, Gd3+, Sm3+, Pr3+; x=0.0, 0.1, 0.3, 0.5, 0.7, 0.9) were synthesized by the reaction of RECl3·6H2O with HNPPD and DPQ in stoichiometry. The complexes were characterized with IR, elemental analysis, TGA-DSC and wide-angle X-ray diffraction. The UV-Vis absorption spectra and fluorescence properties of the complexes were also investigated. The experimental results showed that the luminescence efficiency of Eu3+ complexes was enhanced by doping some other lanthanide ions. Eu0.7La0.3(NPPD)3·(DPQ) showed the highest luminescence efficiency.     

Influence of the substitution of Sm, Gd, and Dy for La in La0.7Sr0.3MnO3 on its magnetic and electric properties and strengthening effect on room-temperature CMR

A series of La0.7-xSmxSr0.3MnO3, La0.7-xGdxSr0.3MnO3, and La0.7-xDyxSr0.3MnO3 (x=0.00, 0.10, 0.20, 0.30) samples were prepared by the solid-state reaction method. The influence of the substitution of Sm, Gd, and Dy for La on the magnetic and electric properties and on the magnetoresistance (MR) was studied through measurements of M-T curves and p-T curves. The results showed that: lattice distortion in-duced by substitution of Sm, Gd, and Dy for La and extra magnetism of substitution had great influence on the magnetic and electric proper-ties of perovskite manganites; substitution of magnetic rare earth element for La was an effective way to change Curie temperature and to strengthen MR in perovskite manganites; and appropriate substitution proportion would generate large MR near room temperature.     

Effects of Light Rare Earth on Acidity and Catalytic Performance of HZSM-5 Zeolite for Catalytic Cracking of Butane to Light Olefins

The effects of rare earth（RE）on the structure,acidity,and catalytic performance of HZSM-5 zeolite were investigated.A series of RE/HZSM-5 catalysts,containing 7.54% RE（RE=La,Ce,Pr,Nd,Sm,Eu or Gd）,were prepared by the impregnation of the ZSM-5 type zeolites（Si/Al=64：1）with the corresponding RE nitrate aqueous solutions.The catalysts were characterized by means of FT-IR,UV-Vis,NH3-TPD,and IR spectroscopy of adsorbed pyridine.The catalytic performances of the RE/HZSM-5 for the catalytic cracking of mixed butane to light olefins were also measured with a fixed bed microreactor.The results revealed that the addition of light rare earth metal on the HZSM-5 catalyst greatly enhanced the selectivity to olefins,especially to propylene,thus increasing the total yield of olefins in the catalytic cracking of butane.Among the RE-modified HZSM-5 samples,Ce/HZSM-5 gave the highest yield of total olefins,and Nd/HZSM-5 gave the highest yield of propene at a reaction temperature of 600℃.The presence of rare earth metal on the HZSM-5 sample,not only modified the acidic properties of HZSM-5 including the amount of acid sites and acid type,that is,the ratio of L/B（Lewis acid/Brnsted acid）,but also altered the basic properties of it,which in turn promoted the catalytic performance of HZSM-5 for the catalytic cracking of butane.     

镧-钼复合氧化物超细微粒催化剂的合成及表征

以柠檬酸为络合剂,采用溶胶-凝胶法合成了镧-钼复合氧化物超细微粒催化剂,使用DTA-TG、IR、XRD以及BET比表面测试等表征手段,考察了制备条件与热处理条件对复合氧化物超细微粒形成、结构和表面积的影响.结果表明本方法制备的La2(MoO4)3复合氧化物的比表面积远远大于共沉淀法制得的类似样品的比表面积,在氮气气氛中分解镧-钼凝胶中的柠檬酸,可有效地避免柠檬酸分解发生氧化燃烧而引起微粒烧结.     

Oxidative dehydrogenation of ethane over RE-NiO （RE=La, Nd, Sm, Gd） catalysts

RE-NiO(RE=La,Nd,Sm,Gd) catalysts were prepared by a modified sol-gel method and characterized by X-ray diffraction(XRD),transmission electron microscopy(TEM),BET surface area analysis,H 2 temperature-programmed reduction(H 2-TPR),and O 2 temperature-programmed desorption(O 2-TPD).The oxidative dehydrogenation of ethane(ODHE) to ethylene was applied to evaluate catalytic performance of the samples.The results showed that the doping of RE affected the physicochemical properties of the catalysts.The strong interaction between Gd and NiO played an important role in the lessened reducibility and the distribution of adsorbed oxygen species,consequently influenced the catalytic performance.The best yield to ethylene of 29% was obtained over the Gd-NiO catalyst with an ethane conversion of 56%.     

Extraction Mechanism of Rare Earths with Sec-Octylphenoxy Acetic Acid by Two-Phase Titration Technique

Ｒａｒｅｅａｒｔｈｅｌｅｍｅｎｔｓａｒｅｕｓｅｄｗｉｄｅｌｙｂｅ ｃａｕｓｅｏｆｔｈｅｉｒｓｐｅｃｉａｌｅｌｅｃｔｒｉｃａｌ,ｍａｇｎｅｔｉｃａｎｄｏｐｔｉｃａｌｎａｔｕｒｅｓ .Ｗｉｔｈｔｈｅｈｉｇｈ ｓｐｅｅｄｄｅｖｅｌｏｐ ｍｅｎｔｏｆｍｏｄｅｒｎｓｃｉｅｎｃｅａｎｄｔｅｃｈｎｏｌｏｇｙ ,ｔｈｅｎｅｅｄｆｏｒｒａｒｅｅａｒｔｈｓｗｉｔｈｈｉｇｈｐｕｒｉｔｙｉｓｉｎｃｒｅａｓ ｉｎｇ .Ｓｏｉｔｉｓｖｅｒｙｉｎｔｅｒｅｓｔｉｎｇｔｏｓｔｕｄｙｔｈｅｓｅｐａ ｒａｔｉｏｎａｎｄｐｕｒｉｆｉｃａｔｉｏｎｏ…     

Preparation of ultrafine Ce-based oxide nanoparticles and their catalytic performances for diesel soot combustion

The ultrafine Ce-based oxide nanoparticles with different element dopings （Zr, Y） were synthesized by the method of mi- cropores-diffused coprecipitation （MDC） using ammonia solution as the precipitation agent. The activities of the catalysts for soot oxidation were evaluated by the temperature-programmed oxidation （TPO） reaction. Ce-based oxides prepared in this study exhibited high catalytic activity for soot oxidation under tile condition of loose contact between soot particles and catalysts, and the catalytic ac- tivity ofultrafine Ce0.gZr0 iO2 nanoparticle for soot combustion was the highest, whose/＂10, Ts0 and Sco2m was 364, 442 ~C and 98.3%, respectively. All catalysts were systematically characterized by means of X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, Brumauer-Emett-Teller （BET）, Fourier transform infrared spectroscopy （FT-IR） and UV-Vis diffuse reflectance spectroscopy （UV-Vis DRS）. It was indicated that the MDC method could prepare the ultrafine Ce-bascd oxide nanoparticles whose the crystal lattice were perfect, and the BET surface area and average crystal size of the ultrafine nanoparticles changed with the different element dopings （Zr, Y）. The H2-TPR measurements showed that the ultrafine Ce-based ox- ide nanoparticles with the doping-Zr cation could be favorable for improving the redox property of the catalysts.     

Synthesis and Electrical Properties of La0.8Sr0.2-xCaxCo0.9Fe0.1O3-δ

Ａｎｉｍｐｏｒｔａｎｔｇｏａｌｉｎｔｈｅｄｅｖｅｌｏｐｍｅｎｔｏｆｓｏｌｉｄｏｘ ｉｄｅｆｕｅｌｃｅｌｌｓ (ＳＯＦＣｓ)ｉｓｔｏｒｅｄｕｃｅｔｈｅｏｐｅｒａｔｉｎｇｔｅｍ ｐｅｒａｔｕｒｅｏｆｔｈｅｆｕｅｌｃｅｌｌｓｔａｃｋｆｒｏｍ 10 0 0℃ｔｏｂｅｌｏｗ85 0℃ｓｏａｓｔｏｇｅｔａｎｏｐｔｉｍｕｍｔｒａｄｅ ｏｆｆｂｅｔｗｅｅｎｐｅｒ ｆｏｒｍａｎｃｅａｎｄｌｉｆｅｔｉｍｅｏｆｔｈｅｓｔａｃｋａｎｄｔｏｒｅｄｕｃｅｔｈｅｏｖｅｒａｌｌｓｙｓｔｅｍｃｏｓｔ[1] .Ｔｏａｃｈｉｅｖｅｔｈｉｓｄｅｓｔｉｎａｔ…