十水草酸铈热分解过程和非等温动力学研究

用热重—差热分析法研究了十水草酸铈(Ce2(C2O4)3·10H2O)在程序升温下的热分解行为,TG曲线表明它有五个分解阶段,前三个阶段为脱水过程,后两个阶段为无水草酸铈热分解过程,最终产物为CeO2。对第四阶段无水草酸铈热分解为碳酸氧盐的过程进行了动力学研究,确定了其反应级数为2,表观活化能E=283.55kJ·mol-1,指前因子lnA=57.3119,热分解反应过程受F2机理控制。     

钼钨硅杂多酸稀土盐的合成与表征

用复分解法合成出通式为ＬｎＨＳｉＭｏ１０Ｗ２Ｏ４０·ｘＨ２Ｏ（Ｌｎ＝Ｌａ、Ｃｅ、Ｐｒ、Ｎｄ、Ｓｍ、Ｅｕ、Ｇｄ、Ｔｂ、Ｄｙ、Ｙｂ）十种钼钨硅杂多酸稀土盐，利用ＩＲ、ＵＶ、ＸＲＤ进行了表征，借助ＴＧ－ＤＴＡ对配合物的热解性质进行了研究，得到了配合物热稳定存在的温度范围为４００～４５０℃。     

Er(ONO)(C8H7O3)2(H2O)3配合物的合成、表征及热分解动力学机理研究

合成了亚硝酸根·二(4-羟基-3-甲氧基-苯甲醛)·三水合铒(Ⅲ)配合物Er(ONO)(C8H7O3)2(H2O)3,用元素分析、红外光谱、摩尔电导、热重分析等手段进行表征.配合物的中心金属离子Er(Ⅲ)与2个香兰素配体中的2个酚羟基氧和2个甲氧基氧、亚硝酸根中的1个氧及3个配位水分子中的3个氧原子发生配位,配位数为8.用热重法研究了配合物的热分解动力学机理.     

八水碳酸镨的热分解及其动力学分析

采用碳酸氢钠和氯化镨制备八水碳酸镨颗粒后,运用TG-DSC技术,在不同程序升温下,研究八水碳酸镨(Pr_2(CO_3)_3·8H_2O)的热分解过程。分别采用Ozawa-Flynm-Wall法、Kissinger法、Crane法和Coats-Redfem法确定其热分解动力学参数。TG-DSC表明,八水碳酸镨热分解过程为3个阶段,第一阶段为脱水反应,第二阶段碳酸镨分解为Pr_2CO_5,第三阶段为Pr_2CO_5分解为Pr_6O_(11)。运用Coats-Redfem积分法得出第二阶段反应的反应机理受二维扩散机理控制,第三阶段反应的反应机理受成核和生长机理控制。在确定了八水碳酸镨热分解反应机理函数的前提下,实验计算得出三阶段反应的表观活化能E分别为47.24 kJ·mol~(-1)、220.94 kJ·mol~(-1)、120.71 kJ·mol~(-1);指前因子A分别为5.80×10~4 S~(-1)、1.35×10~(11) S~(-1)、6.22×10~2 S~(-1);第一阶段和第二阶段反应级数约为1,第三阶段反应级数为0.88。     

硝酸稀土与二水杨酸二甘醇二酯的配位研究

本文用硝酸稀土与水杨酸二甘醇二酯(简写为SE02或L)在乙酸乙酯溶液中反应,合成了一系列新的固体配合物。以La、Gd、Lu的配合物为代表,用元素分析确定其组成为Ln(NO3)3C18H18O7·nH2O(n=2或3),用IR、UV光谱考察了配合物中稀土与配体间的配位情况,证明配体中的酚羟基氧、酯羰基氧和醚氧均参与了配位,其中以末端基的酚羟基氧和羰基氧的配位为主,与重稀土的配位强度明显高于轻、中稀土。配合物在空气、水及有机溶剂中稳定性好,加热时要到300℃左右才发生放热分解反应,且重稀土的稳定性明显高于轻、中稀土。     

1,9—双（1‘—苯基—3’—甲基—5‘—氧代吡唑—4’—基）壬二酮—[1,9]与三辛基氧膦

研究了１,９－双（１’－苯基－３’－甲基－５’－氧代吡唑－４’－４基）壬二酮－「１,９」（ＢＰＭＰＮＤ,Ｈ２Ａ）与三辛基氧膦（ＴＯＰＯ）或三苯基氧膦（ＴＰＰＯ）的氯仿溶液从硝酸介质中对铕（Ⅲ）的协同萃取行为。用萃取法制得了固态协萃合物,并对其组成和ＩＲ进行了研究。     

0℃时YI3-C6H12N4·HI-H2O的相图及YI3·C6H12N4·HI·14H2O的合成与表征

采用湿渣法研究了０℃时碘化钇（ＹＩ３）－乌洛托品氢碘酸盐（Ｃ６Ｈ１２Ｎ４·ＨＩ）－水（Ｈ２Ｏ）的三元体系相平衡,绘制了该体系的等温溶解度相图,相图分析结果表明,该体系中有组成为ＹＩ３·Ｃ６Ｈ１２Ｎ４·ＨＩ·１４Ｈ２Ｏ的配合物生成,对所得配合物进行了化学分析、Ｘ－射线粉末衍射、红外光谱、差热－热重分析,测定了其密度、晶体轴性,确定了配合物结构中的配位关系。     

稀土与L-亮氨酸、咪唑三元配合物的合成及抑菌作用研究

在乙醇介质中,用氯化稀土盐与L亮氨酸、咪唑反应合成了稀土三元配合物[RE(Leu)3Im(H2O)]Cl3·2H2O(RE=La,Dy,Y;Leu L亮氨酸;Im咪唑)。通过化学分析、元素分析确定了配合物的组成;并利用摩尔电导率测定、IR,UV及TG DTG等对配合物进行了其配位行为和热分解机制的研究;抑菌实验表明该类配合物对大肠杆菌均具有不同程度的抑制作用,以ρ(配合物)=10g·L-1用药,24h后对大肠杆菌的菌落抑制率均为100%。     

混合碳酸稀土热分解过程的研究

用 DTA热分析技术研究混合碳酸稀土焙烧过程中的脱水过程、分解过程 .用 Freeman-Carroll法、Piloyan法和 Kissinger法对其脱水及热分解的动力学参数进行计算 ,并对计算的结果进行比较和验证 ,得到了混合碳酸稀土脱水过程的反应活化能和反应级数分别为 80 6.9J/mol、0 .78,热分解过程的反应活化能和反应级数分别为 8.52 9k J/mol、 0 .95.用 XRD分析方法研究了不同焙烧温度对焙烧产物的影响 ,论证高温下焙烧可能产生 Ce0 .75Nd0 .2 5O1.875相     

化学二氧化锰的制造方法

本发明为化学二氧化锰的制造方法。是关于加热分解锰、铵和氨基甲酸盐得到碳酸锰后,再用含水蒸气的氧氧化,最终获得改进的二氧化锰的制造方法。 1979—128408号公开专利中已提出:用合成方法来制造干电池用MnO_2,其MnO_2品位、活性度和松装密度均具有充分的实用性,并且确立了以锰、铵和氨基甲酸盐为原料,在68℃以上温度中分解生成重质MnCO_3,然后将该重质MnCO_3在含水蒸气     

Synthesis and Thermal Decomposition Mechanism of Rare Earth Benzoates

Rareearthbenzoatesareakind0fstablecompounds.Theco0rdinationcomP0undsf0rmedbyrareearthandcarboxylicacidshaveunusualstructuresandinterestinglundnesceniProperties.Bymeansoff0rmingc0njugaedcomplexes,rareearthmetalsandcarb0xylicacidscanf0rmnetorlayerp0lymerandchangetheirlundnescentprop-erties.S0merareearthcomplexeshavebeenap-Pliedinagricultureaslight-transfeedngmaeri-al8-Althoughthermaldecompositi0nmechanismofrareearthbenz0ateshasbeenreported,itdealswith0nlys0lidphaseproducts["'1,litdeab0utgasPha…     

Preparation and Characterization of Er2O3 Nanocrystals by Schiff Base Salt Combustion Method

The nanocrystals Er2O3 were prepared by using a combustion method with Schiff base as a chelating agent. The Er(Ⅲ) coordanation compound of Schiff base, obtained from erbium nitrate and retinal Schiff base, underwent a combustion process and voluminous ashes formed when calcimining the complex in air. Pure cubic Er2O3 nanocrystals with a diameter of 13nm were produced. The nanocrystals were homogeneous and rigid coacervation was not observed. The photoluminescence emission spectrum of the erbium (Ⅲ) oxide nanocrystals shows that it has a characteristic peak at 1.54μm, and some other shoulder peaks appear on both sides of the main peak.     

Synthesis of an Aluminum–Erbium Master Alloy from Chloride–Fluoride Melts

Available foreign power-intensive technologies and the absence of domestic production technologies for aluminum–erbium master alloys intended for improving the physicomechanical properties of aluminum alloys make the development of aluminothermic reduction technology of chloride–fluoride melts actual for manufacturing erbium compounds. Thermodynamic analysis of reduction processes is performed for various erbium compounds. Taking into account the physical and chemical properties of erbium compounds, a starting compound, namely, erbium fluoride is found to be preferable. The aluminothermic reduction of the compound from its mixture with sodium fluoride and potassium chloride to form the Al₃Er intermetallic compound is characterized by a high thermodynamic probability. Since data on thermodynamic parameters for erbium complex compound are scanty, they are determined by an indirect method. Experimental data on the aluminothermic preparation of an Al–Er master alloy at temperatures of 750–900°C using melts differing in the ErF₃/NaF ratio and the KCl content are reported; the structure and the phase composition of the prepared master alloy are studied. The phase composition of the flux used for the preparation of the Al–Er master alloy is determined.     

Syntheses, Crystal Structures and Kinetic Mechanisms of Thermal Decomposition of Rare Earth Complexes with Schiff Base Derived from o-Vanillin and p-Toluidine

Withtheincreasingapplicationofrareearthmet alsinavarietyoffields,rareearthionscontinuallyin trudeintogeneralenvironmentandfurtherintothe bodiesofplants,animalsandhumanbeings.Itis thereforeofsignificancetoinvestigatethephysiological actionandlong termeffectofrareearthiononbiologi calbodies.VariousstudieshaveshownthatSchiff basesderivedfromsalicylaldehydeanditsderivatives haveconsiderablebiologicalimportancepartlybecause suchligandshavemanydonoratoms(N,O)andare analogoustobiologicalenvironmentt…     

Decomposition Reaction of Mixed Rare Earth Concentrate and Roasted with CaO and NaCl

The reaction of the mixed rare earth concentrate including monazite ( REPO4 ) and bastnaesite ( REFCO3 )decomposed by CaO and NaCl additives at the temperature range from 100 to 1000 ℃ was studied by means of XRD and TG-DTA.The results show that when CaO and NaCl are not added, only REFCO3 can be decomposed at the temperature of 377 ～ 450 ℃.The decomposition products include REOF, RE2O3 and CeO2.However, REFCO3 can not be decomposed.When CaO is added, the decomposition reactions occur at the temperature range from 660 to 750 ℃.CaO has three decomposition functions: ( 1 ) REPO4 can be decomposed by CaO and the decomposition products include RE2O3 and Ca3 (PO4)2; (2) CaO can decompose REOF, and the decomposition products are RE2O3 and CaF2; (3)CaO can decompose REPO4 with CaF2, and the decomposition products are RE2 O3, Ca5 F( PO4 )3.The decomposition ratio of the mixed rare earth concentrate increased obviously, when CaO and NaC1 were added.NaC1 can supply the liquid for the reaction, improve the mass transfer process and accelerate the reaction.At the same time, NaC1 participated in the reaction that REPO4 was decomposed by CaO.     

P204萃取铒的热力学和动力学研究

用含萃取剂P204的磺化煤油对稀土离子Er~（3+）进行萃取平衡研究,得到了萃取平衡式和平衡常数。用恒界面槽测量稀土离子的萃取速率和反萃速率,考察了Er~（3+）浓度、H~+浓度、P204液度和络合物浓度对反应速率的影响,从而得到了反应速率的表达式。提出了界面反模型,用动力学及界面张力实验进行了验证。     

Thermal Decomposition Mechanism and Non Isothermal Kinetics of Complex of [La_2(P-MBA)_6(PHEN)_2]2H_2O

Ｏｗｉｎｇｔｏｔｈｅｖａｒｉａｔｉｏｎｏｆｃｏｏｒｄｉｎａｔｅｄｍｏｄｅｓｆｏｒｃａｒｂｏｘｙｌａｔｅａｎｉｏｎｓ ,ｍａｎｙｄｉｆｆｅｒｅｎｔｔｙｐｅｓｏｆｃｒｙｓｔａｌｓｔｒｕｃｔｕｒｅｓｆｏｒｔｈｅｒａｒｅｅａｒｔｈｃｏｍｐｌｅｘｅｓｗｉｔｈａｒｏｍａｔｉｃａｃｉｄａｎｄｎｉｔｒｏｇｅｎ ｃｏｎｔａｉｎｉｎｇｌｉｇａｎｄｓｗｅｒｅｏｂｔａｉｎｅｄ[1～ 4 ] .Ｔｈｅｉｒｔｈｅｒｍａｌｄｅｃｏｍｐｏｓｉｔｉｏｎｂｅｈａｖｉｏｒｈａｄｂｅｅｎｒｅ ｐｏｒｔｅｄｉｎｐｒｅｖｉｏｕｓｐａｐｅｒｓ[5～ 8] .…     

十水草酸镧的热分解及其动力学分析

用热重-差热(TG-DTA)技术,在不同升温速率条件下,研究了十水草酸镧在空气气氛下的热分解过程.分别采用Ozawa-Flynm-Wall法、Kissinger法、Crane法和同步热分析法确定其热分解动力学参数.TG-DTA曲线表明:十水草酸镧分解为四个阶段,前两个阶段为脱水过程,后两个阶段为La_2(C_2O_4)_3的分解过程.实验计算得出四步反应表观活化能E分别为83.92、76.04、136.26、162.61 k J·mol-1左右;指前因子A分别为4.92×10~(10)、6.1×10~7、2.1×10~9、8.46×10~6s-1左右;反应级数n均为1左右,并用Coats-Redfem积分法得出第三步分解机理受F1控制.     

Mechanochemical Reaction of Lanthanum Carbonate with Sodium Hydroxide and Preparation of Lanthanum Oxide Nanoparticle

Ｔｈｅｉｍｐｏｒｔａｎｃｅｏｆｎａｎｏｓｉｚｅｄｒａｒｅｅａｒｔｈｏｘｉｄｅｐｏｗｄｅｒｓｉｎｖａｒｉｏｕｓｔｅｃｈｎｉｃａｌａｐｐｌｉｃａｔｉｏｎｓｍａｋｅｓｔｈｅｉｒｐｒｅｐａｒａｔｉｏｎｔｅｃｈｎｏｌｏｇｙａｎｉｎｔｅｒｅｓｔ ｉｎｇｓｕｂｊｅｃｔｆｏｒｒｅｓｅａｒｃｈｗｏｒｋ[1 ] .Ｏｖｅｒｔｈｅｐａｓｔｄｅｃａｄｅｓ,ｍａｎｙｐｒｅｐａｒａｔｉｏｎｍｅｔｈｏｄｓｏｆｎａｎｏ ｓｉｚｅｄｒａｒｅｅａｒｔｈｏｘｉｄｅｓｈａｖｅｂｅｅｎｄｅｖｅｌｏｐｅｄ ,ｉｎｃｌｕｄｉｎｇｐｈｙｓｉｃａｌａｎｄ…     

Magnetic Properties and Activity of Pt-Er/γ-Al2O3 Catalysts

A series of Pt-Er/γ-Al2O3 catalysts containing 0.5%(mass fraction) platinum and 0.05%-1.5% Er were prepared by impregnation of γ-Al2O3 supported with different concentrations of erbium chloride solution. The surface properties of the catalysts were studied by methods of temperature programmed reduction and temperature programmed desorption. The magnetic behavior of Pt-Er-γ-Al2O3 catalysts were studied with a Faraday magnetic balance and the results show that the addition of Er can affect the surface properties, the catalytic activities, and magnetic behavior of the reforming catalysts. It is found that there is a corresponding relationship between the susceptibility and selectivity of Pt-Er-γ-Al2O3 catalysts. The experimental results show that Er plays the role of electron promoter.