Fe/ZrO2催化剂的Mossbauer谱及XAFS表征

考察了经不同温度还原的Ｆｅ／ＺｒＯ２催化剂在ＣＯ２加氢制低碳烃反应中的催化活性,最佳结果为ＣＯ２转化率２７．０％,对Ｃ２＋烃的选择性５６．７％,采用ＸＲＤ,＾５７ＦｅＭｏｓｓｂａｕｅｒ谱,Ｆｅ－Ｋ－吸收边的Ｘ射线吸收近边结构（ＸＡＮＥＳ）及扩展Ｘ射线吸收精细结构（ＥＸＡＦＳ）等表征方法研究了催化剂的表面结构。结果表明,在ＺｒＯ２表面上主要存在α－Ｆｅ及配位不饱和的Ｆｅ＾３＋两种物种。催化剂表面明显呈氧缺位,零价铁相对富集的状态,还原温度对表面结构有显著的影响,最佳还原温度与表面Ｆｅ－Ｏ键的键长有关,结合这种催化剂在ＣＯ２加氢制低碳烃反应中的催化活性,认为α－Ｆｅ与配位不饱和的Ｆｅ＾３＋物种的协同作用是其具有较高催化活性的重要原因。     

碘量法测定冶金物料中铁

系统地研究了Ｆｅ＾３＋与Ｉ＾－定量反应的条件，共存离子的干扰及消除方法，在ＨＣｌ和ＫＩ存在下，Ｆｅ＾３＋与Ｉ＾－定量反应，Ｃｕ＾２＋，ＡｓＯ４＾３－，ＶＯ２＾＋，等定量干扰，使用ＮａＦ或Ｈ３ＰＯ４制备参比液可抵消干扰。可不经分离直接测定大部分冶金物料中的高含量铁。     

铁基高温变换催化剂制备的穆斯堡尔谱研究Ⅰ.铁氧化物前驱态的相变过程

用穆斯堡尔谱及ＸＲＤ技术对不同铁氧化物前驱态的相变过程进行了，ＦｅＣＯ３沉淀在空气中老化时被氧化分解生成ＦｅＯ（ＯＨ），经干燥、煅烧后合部转化为ａ－Ｆｅ２Ｏ３。（Ｆｅ（ＯＨ）２沉淀物在空气中老化时则转化为Ｆｅ３Ｏ４．２Ｈ２Ｏ和ＦｅＯＯＨ，两者的相对含量受Ｆｅ＾２＋的迁移速率和Ｆｅ（ＯＨ）２的氧化速度的影响。     

Eu^3＋,Bi^3＋Me2Y8（SiO4）6O2中的发光特性与取代格位

在紫外光激发下，Ｅｕ＾３＋和Ｂｉ＾３＋在Ｍｅ２Ｙ８（ＳｉＯ４）６Ｏ２基质（Ｍｅ＝Ｍｇ，Ｚｎ，Ｃａ，Ｓｒ）中分别发射红光（＾５Ｄ０－＾７Ｆ２）和蓝光（＾３Ｐ１－＾１Ｓ０）．Ｅｕ＾３＋发光的红橙比随着激发波长和Ｍｅ＾２＋的不同而变化。荧光拉曼光谱表明，Ｅｕ＾３＋在四种基质中同时占据了４ｆ格位和６ｈ格位。依据Ｂｉ＾３＋发光的Ｓｔｏｋｅｓ位移推断，当Ｍｅ＝Ｃａ，Ｚｎ时，Ｂｉ＾３＋主要占据４ｆ格位，而当Ｍｅ     

氧化铁在ZnO上分散的结构状态及其表征

采用（ＮＨ_４）_３［Ｆｅ（Ｃ_２Ｏ_４）_３］·ｘＨ_２Ｏ的水溶液含浸，Ｆｅ（ＮＯ_３）_３．９Ｈ_２Ｏ水溶液饱和浸渍（含浸）以及Ｆｅ（ＡｃＡｃ）_３的甲苯溶液热吸附三种方法制备了在ＺｎＯ上分散的氧化铁体系。用多种物理化学手段对用不同方法制备的分散体系进行了细致的表征，氧化铁在ＺｎＯ上形成单层分散是困难的。Ｆｅ~（３＋）一般进入到ＺｎＯ载体的表层，结构环境类似于ＺｎＦｅ_２Ｏ_４微晶中的Ｆｅ~（３＋），分散的Ｆｅ~（３＋）通常处于高自旋态，配位对称性并不是正交畸变。在ＺｎＯ上形成尖晶石的趋势最强。在亚单层铁含量范围内，通常形成表面ＺｎｘＦｅ_ｙＯ_ｚ。当铁含量超过单层阈值时，既生成ＺｎＦｅ_２Ｏ_４簇也有ＦｅＯ_ｘ簇存在。无论是ＦｅＯ_ｘ或ＺｎＦｅ_２Ｏ４簇还是表面的Ｚｎ_ｘＦｅ_ｙＯｚ，其Ｆｅ_（３＋）在实验温度范围内，很难被还原为零价铁，ＦｅＯ_ｘ较之Ｚｎ_ｘＦｅ_ｙＯ_ｚ物种难以还原且比体相ａ－Ｆｅ_２Ｏ_３中Ｆｅ~（３＋）要难还原得多。由热吸附法制得的ＦｅＯ_ｘ和ＺｎＦｅ_２Ｏ_４簇具有很低的催化活性，而由含浸法制得的表面Ｚｎ_ｘＦｅ_ｙＯｚ的反应性能有明显的改善。ＺｎＯ载体上不同含铁物种的反应性由Ｆｅ~（３＋）的还原性及是否存在活泼     

皂化酸性磷酸酯萃取稀土离子过程中有机相的FTIR光谱表征

研究了不同浓碱皂化的Ｄ２ＥＨＰＡ－正庚烷体系萃取－系列稀土离子（Ｌａ＾３＋－Ｌｕ＾３＋）放射性的Ｐｍ除外）过程中有机相的ＦＴＩＲ光谱变化规律，结果说明，Ｄ２ＥＨＰＡ萃取稀土离子后，Ｐ－Ｏ基团５的红外吸收频率降低，吸收强度升高，说明Ｐ－Ｏ基团与稀土离子发生配位；红外光谱研究研究结果表明：不同稀土离子与Ｐ－Ｏ配位能力有差别，从Ｌａ＾３＋－Ｓｍ＾３＋ｓｇｎ ｗｕｇ ｃｅｌｔｗｙｅ ｕｑｗ ｆｕｌｊｅ ｓ     

Fe^3+(Cr^3+)/Fe^2+混合离子制备铁铬中变催化剂

以Ｆｅ＾３＋（Ｃｒ＾３＋）／Ｆｅ２＋混合离子和氨水为原料，用共沉淀方法制备出ｒ－Ｆｅ２Ｏ３（ＦｅＯ４）晶型的铁络中变催化剂，在３２５℃，５００ｈ＾－１，汽气比２：１条件下，ＣＯ转化率高达９７％，用高分辨透射电镜对还原后催化剂形貌的观察表明，其粒子大小分布比由ａ－Ｆｅ２Ｏ３还原所得ＦｅＯ４列均匀。用该方法制备的铁路中变催化剂，已成功地在中小型合成氨厂使用。     

掺Ce提高（CoFe）3O4的矫顽力

采用添加剂湿法制备了掺入不同Ｃｅ含量的Ｃｅｘ（ＣｏＦｅ）３－ｘＯ４铁氧体。对产物的物相，形貌，磁性能研究表明，所得产物均为单一的尖晶石结构，一般情况下呈颗粒状，矫顽力随溶液中Ｃｅ＾４＋浓度的增加而增加。当溶液中含有Ｃｅ＾３＋和Ｃｅ（ＯＨ）４时，产物显示有部分棒状晶体，矫顽力有明显提高，且当「Ｃｅ＾３＋」占（「Ｃｅ＾３＋」＋Ｃｅ＾４＋「）总量的５％左右时所得产物矫顽力最大。     

氧缺位铁酸盐MFe2O4—δ的性质研究

使用ＸＲＤ，Ｍｏｅｓｓｂａｕｅｒ谱及化学组成分析考察了氧缺位铁酸盐ＭＦｅ２Ｏ４－δ的晶格常数，磁性，稳定性及还原性。结果表明，氧缺位铁酸盐ＭＦｅ２Ｏ４－δ晶格常数比ＭＦｅ２Ｏ４＋δ的大，Ｍｏｅｓｓｂａｕｅｒ谱内磁场却更小。ＭＦｅ２Ｏ４－δ随着氧缺位程度δ的增大，晶格常数增大，内磁场减小。     

氧化铈在非贵金属氧化物催化剂中的作用：Ⅵ.Cu—Fe—Ce—O催化剂的结 …

采用ＸＲＤ,顺磁共振（ＥＳＲ）,Ｍｏｓｓｂａｕｅｒ和或温还原（ＴＰＲ）技术对负截型Ｃｕ－Ｆｅ－Ｏ（Ⅰ）,Ｃｕ－Ｆｅ－Ｃｏ－Ｏ（Ⅱ）催化剂的固相结构及热稳定性进行了研究。结果发现,（Ⅰ）中主要存在Ｆｅ２ＣｕＯ４,ＣｕＯ和颗粒度小于１３ｎｍ的Ｆｅ２Ｏ３相。随着焙烧温度的升高,ＣｕＯ晶相逐渐消失,Ｆｅ２ＣｕＯ４的晶相长大。（Ⅱ）中Ｃｅ的存在,能提高Ｃｕ＾２＋的浓度,抑制ＣｕＯ和Ｆｅ２ＣｕＯ４晶相的生成,     

Neutral diterpenoids of oleoresins of five species of conifers of Transcarpathia

The compositions of the neutral diterpenoids of the oleoresins of five species of conifers growing in the Transcarpathia have been studied. It has been found that the oleoresins ofAbies alba M.,Larix decidua M., andPicea excelsa L. contain more than 50% of neutral diterpenoids. The group and qualitative compositions of the oxygen-containing diterpenoids have been determined. In the oleoresins ofAbies alba,Picea excelsa, andPicea abies tertiary alcohols — cis-abienol and isocembrol — predominate, while inLarix decidua the main component is the hydroxy ester larixyl acetate. Primary alcohols related to the resin acids have been found in all the oleoresins investigated. Features of the distribution of diterpenoids according to the species of conifers have been revealed. The results obtained are necessary for the chemotaxonomy of conifers of the family Pinceae.Novosibirsk Institute of Organic Chemistry, Siberian Branch, Academy of Sciences of the USSR. Translated from Khimiya Prirodynkh Soedinenii, No. 6, pp. 812–816, November–December, 1988.     

利用手持技术改进测定乙醇分子结构实验

利用压强传感器代替排水集气法,改进测定乙醇分子结构实验的仪器装置,并探索最佳反应条件。另外,设计两个空白实验,结合压强变化曲线对实验误差进行相关讨论。     

光谱仪测试范围的扩展

由于石化行业的生产需要，其材质的使用具有多样性和广泛性，经常会出现顾客委托的测试样品的一个或几个元素跨越光谱仪现有测试程序测量范围的情况。本法通过对光谱仪测试原理的认识，根据光谱仪的测试能力及标样的采集，实现了一个或几个元素测量范围的扩展，并对其测量的影响因素进行了研究。     

Effect of the Method of Modification of Zeolite X on Selectivity of Catalytic Methylation of Toluene

Theoretical and Experimental Chemistry - The effect of the method of modification of catalysts based on zeolite X by cesium and magnesium cations (ion exchange and impregnation) on the selectivity...     

Influence of viscosity of medium on processes of oxygen quenching of excited states of mesoporphyrin

The oxygen quenching rate constants for singlet and triplet excited states of the dimethyl ester of mesoporphyrin IX increase with decreasing viscosity of the medium and reach a maximum at a viscosity of approximately 0.4 mPa·sec, after which the rate constants begin to decrease. The drop in rate constant with increasing fluidity of the medium may be related to a nonequilibrium character of the elementary act in the interaction of the reactants in the solvent cage. In viscous media such as isopropyl alcohol, isobutyl alcohol, and isoamyl alcohol, the reaction radius is greater than the sum of the radii of the reacting particles. The long-range character of these processes is due to the relatively weak dependence of the quenching probability on distance.Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 25, No. 2, pp. 161–167, March–April, 1989.     

Dichroism of absorption and polarization of phosphorescence of molecules of the closed form of nitrobenzospirothiopyran

The spectral-polarization characteristics of absorption and phosphorescence of molecules of the initial form of nitro-substituted indolinospirobenzothiopyran were studied in oriented polyethylene films and in solutions with different polarity. An oscillator model of the electron transitions responsible for the formation of absorption and luminescence spectra was suggested. It was established that the principal differences in the spectral and photophysical properties of the compound studied and its oxygen-containing analog are associated with the fact that the electronegativity of the S atom is lower than that of the O atom. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1143–1146, June, 1997.     

Synthesis of tetrabenzoporphins of the basis of isoindoline

Chemistry of Heterocyclic Compounds -