WO_3在TiO_2／γ－Al_2O_3和在TiO_2／SiO_2复合载体表面的分散状态和最大分散量

ＷＯ_３在ＴｉＯ_２／γ－Ａｌ_２Ｏ_３和在ＴｉＯ_２／ＳｉＯ_２复合载体表面的分散状态和最大分散量邓存，陈巧平（宁德师范专科学校化学系，宁德３５２１００）刘英骏（北京大学物理化学研究所，北京１００８７１）关键词ＷＯ_３／（ＴｉＯ_２／γ－Ａｌ_２Ｏ_３）催化...     

CuO／活性炭和Fe2O3／活性炭催化还原NO

ＣｕＯ／活性炭和Ｆｅ_２Ｏ_３／活性炭催化还原ＮＯ高志明，赵震，杨向光，吴越（中国科学院长春应用化学研究所长春１３００２２）关键词活性炭，还原，ＮＯ，氧化铜，氧化铁目前，对固定源的ＮＯ处理是采用Ｖ２Ｏ５／ＴｉＯ２作催化剂，ＮＨ３作还原剂的选择催化还原方...     

CaO／La2O3催化剂上的甲烷氧化偶联反应的研究

研究了不同配比的ＣａＯ／Ｌａ_２Ｏ_３催化剂对甲烷氧化偶联反应的催化性能。适当配比的ＣａＯ／Ｌａ_２Ｏ_３催化剂的性能明显优于纯Ｌａ_２Ｏ_３或ＣａＯ，在钙含量为２４％和８１％（Ｃａ／（ｃａ＋Ｌａ））处，Ｃ_２选择性和Ｃ_２收率分别出现两个峰值。同时还发现，１３％ＣａＯ／Ｌａ_２Ｏ_３样品显示出良好的低温催化性能，在５５０℃反应温度下获得了３１．５％的甲烷转化率和４５％的Ｃ_２选择性。并采用ＸＲＤ、ＸＰＳ和Ｃｏ_２ＴＰＤ等技术研究了催化剂的结构。结果表明，ＣａＯ／Ｌａ_２Ｏ_３体系催化剂上没有检测到新物相产生。但是，催化剂中ＣａＯ与Ｌａ_２Ｏ_３两组分之间存在着相互作用，有利于表面活性中心的形成。     

Skeleton Vibrations and Force Constants of ［Fe_2Cr（μ_3－O）（glycine）_6（H_2O）_3］（NO_3）_7．3H_2O

ＳｋｅｌｅｔｏｎＶｉｂｒａｔｉｏｎｓａｎｄＦｏｒｃｅＣｏｎｓｔａｎｔｓｏｆ［Ｆｅ_２Ｃｒ（μ_３－Ｏ）（ｇｌｙｃｉｎｅ）_６（Ｈ_２Ｏ）_３］（ＮＯ_３）_７．３Ｈ_２ＯＺｈａｎｇＬｉｎ－Ｎａ，ＬｉｎＺｈｅｎｇ－Ｙａｎ（ＳｔａｔｅＫｅｙＬａｂｏｒａｔｏｒｙｏ...     

微波辐照下（Bi_2O_3）_（0．8）（La_2O_3）_（0．2）固熔体对甲

微波辐照下（Ｂｉ_２Ｏ_３）_（０．８）（Ｌａ_２Ｏ_３）_（０．２）固熔体对甲烷氧化偶联的催化行为陈长林,洪品杰,戴树珊,阚家德（云南大学化学系,昆明,６５００９１）关键词微波,甲烷氧化偶联,（Ｂｉ_２Ｏ_３）_（０．８）（Ｌａ_２Ｏ_３）_（０．２）甲烷氧化...     

Electrochemical Study of Trinuclear Metal Complexes ［M_3O_2（O_2CCH_3）_6（H_2O）_3］~（2＋）（M_3＝Mo_3，MoW_2，W_3）

ＥｌｅｃｔｒｏｃｈｅｍｉｃａｌＳｔｕｄｙｏｆＴｒｉｎｕｃｌｅａｒＭｅｔａｌＣｏｍｐｌｅｘｅｓ［Ｍ_３Ｏ_２（Ｏ_２ＣＣＨ_３）_６（Ｈ_２Ｏ）_３］~（２＋）（Ｍ_３＝Ｍｏ_３，ＭｏＷ_２，Ｗ_３）ＬｉｕＨｕａｎｇ；ＸｕＬｉ；ＨｕａｎｇＪｉｎ－Ｓｈｕｎ；ＹａｎＤ...     

MgCO3.3H2O水热分解产物及其组成

ＭｇＣＯ_３·３Ｈ_２Ｏ水热分解产物及其组成翟学良，周相廷，李美玲（河北师范大学化学系石家庄０５００１６）关键词ＭｇＣＯ_３·３Ｈ_２Ｏ，Ｍｇ_５（ＣＯ_３）_４（ＯＨ）_２·８Ｈ_２Ｏ，Ｍｇ_５（ＣＯ_３）_４（ＯＨ）_２·５Ｈ_２Ｏ，水热分解，中间体ＭｇＣＯ_...     

［La（EO_3）_3（H_2O）］（ClO_4）_3·H_2O的晶体结构

稀土高氯酸盐开环冠醚三缩乙二醇（ＥＯ_３）［Ｌａ（Ｃ_６Ｈ_（１４）Ｏ_４）_３（Ｈ_２Ｏ）］（ＣｌＯ_４）_３·Ｈ_２Ｏ，单斜晶系，Ｐ２_１／ｃ空间群。晶胞参数为：ａ＝１５．４７４（２），ｂ＝１１．３８６（１），ｃ＝２０．８４１（４），β＝９９．８２（１）°，Ｖ＝３６１８（１），ＭｏＫα，Ｚ＝４，Ｄ_ｃ＝１．７１８ｇ／ｃｍ３，μ＝１．４９９ｍｍ￣（－１）。全矩阵最小二乘精细修正，结构因子Ｒ＝０．０５６，Ｒ_ｗ＝０．０８３。中心原子Ｌａ与开环冠醚醚链上的Ｏ（１）～Ｏ（９）及一个水分子形成１０配位双帽四方反棱柱结构。弱配体高氯酸根不参加配位。     

THE SYNTHESIS AND CRYSTAL STRUCTURE COMPLEX OF SCHIFF BASE CONTAINING S·N－Cd_3｜CH_3O（O）C_6H_3CH＝NNHC（S）NH_2｜4·（CH_3COO_2·1／2［CH_3S（O）CH_3］·2H_2O

ＴＨＥＳＹＮＴＨＥＳＩＳＡＮＤＣＲＹＳＴＡＬＳＴＲＵＣＴＵＲＥＣＯＭＰＬＥＸＯＦＳＣＨＩＦＦＢＡＳＥＣＯＮＴＡＩＮＩＮＧＳ·Ｎ－Ｃｄ_３｜ＣＨ_３Ｏ（Ｏ）Ｃ_６Ｈ_３ＣＨ＝ＮＮＨＣ（Ｓ）ＮＨ_２｜４·（ＣＨ_３ＣＯＯ_２·１／２［ＣＨ_３Ｓ（Ｏ）ＣＨ_３］·?..     

Crystal Structure of Calcium Complex with Cyanuric Acid Ligand［Ca（C_3H_3N_3O_3－O）（H_2O）_6］［（OH）（C_3H_2N_3O_3）］

ＣｒｙｓｔａｌＳｔｒｕｃｔｕｒｅｏｆＣａｌｃｉｕｍＣｏｍｐｌｅｘｗｉｔｈＣｙａｎｕｒｉｃＡｃｉｄＬｉｇａｎｄ［Ｃａ（Ｃ_３Ｈ_３Ｎ_３Ｏ_３－Ｏ）（Ｈ_２Ｏ）_６］［（ＯＨ）（Ｃ_３Ｈ_２Ｎ_３Ｏ_３）］ＬｉｎＺｈｏｕ－Ｂｉｎ；ＣｈｅｎＣｈａｎｇ－Ｚｈａｎｇ；...     

EFFECTS OF RARE EARTH OXIDES ON PERFORMANCES OF Ni/Al_2O_3 CATALYSTS FOR METHANE STEAM REFORMING REACTION

The Catalytic performances for methane steam reforming reaction ofNi/Al_2O_3(commercial), Ni/Al_2O_3 (developed surface )and Ni/Al_2O_3-R_xO_y (R israre earth oxide) Catalysts were investigated by means of X-ray diffraction,TG, SEM/ X-ray analysis, pulse gas chromatography,BET and Mercuryporsiniter techniques. The distribution of rear earth oxides on the supports,themetal-support (additives) interaction and the influence of rare earth oxideadditives on the dispersion of active components,catulytic activities,variationof nickel crystallites size,CO chemisorption,formation of NiAl_2O_4 as well asthe reducibility of the catalysts were examined.The presence of rare earthoxides in the Ni/Al_2O_3 (developed surface) results in great improvement ofstubility through suppressing the growth of Ni crystallites,the oxidation of themetallic Ni and the formation of NiAl_2O_4. The effect of heavy rare earth oxidesis more distinct than that of the light ones.Strong metal support interaction(SMSI) exists in Ni/Al_2O_3- R     

PROMOTING EFFECT OF RARE EARTH OXIDES ON Ni/Re_xO_y-Al_2O_3 CATALYST FOR PARTIAL OXIDATION OF METHANE TO SYNTHESIS GAS

IntroductionSynthesisgas(HZ CO)isproducedfrommethanemoshybysteamrefonningwhichsuffersfromlimitationssuchasveryhighenergyrequirements,complicatedequipmentandinstallations,highHZ/COproductratioandpoorselectivityforcarbonmonoxide.Recently,manyresearchershave…     

钕对苯直接氧化制苯酚催化反应的促进作用

采用溶胶凝胶法制备Cr/Al2O3,Nd-Cr/Al2O3催化剂,通过X射线衍射(XRD)、N2吸附脱附和透射电子显微镜(TEM)对催化剂进行表征,结果表明稀土的加入增加了负载过渡金属的氧化铝的比表面积,使孔道结构更加规则有序。程序升温脱附(TPD)、程序升温还原(TPR)、X射线光电子能谱(XPS)和27Al固体核磁共振(27Al MAS NMR)的表征进一步说明稀土金属和过渡金属对载体表面性质和Al配位的影响,在催化反应中铬是主催化剂,钕是助催化剂。将催化剂用于苯一步氧化制备苯酚的反应中,反应结果表明所得催化剂均具有较高活性,并且Nd-Cr/Al2O3的催化活性高于Cr/Al2O3。     

Keggin结构的磷钨钒稀土四元杂多配合物对过氧化氢分解的催化作用

在磷钨钒稀土四元杂多配合物中，由于Ｖ原子的使用，使其对Ｈ２Ｏ２分解的催化活性显著增加。因配合物中心原子稀土元素不同。催化活性也随之变化，其活化能与三阶稀土离子的电离能有密切关系。动力学曲线为Ｓ型。实验证明，在反应过程中有反应活性中间体生成。     

丁二烯在氯化稀土-乙醇-烷基铝催化体系中的某些动力学规律Ⅰ.链增长速度常数的变化规律

本文测出丁二烯在La、Nd、Sm、Gd、Dy、Ho和Y七种稀土氯化物与两种烷基铝分别组成的催化体系中聚合链增长速度常数和活性中心浓度。其30℃时k_p值在6—100 1/mol·sec间,不同稀土催化剂k_p值顺序为:k_p(Nd)～k_p(Sm)～k_p(Gd)>k_p(La)>k_p(Dy)>k_p(Ho)>k_p(Y)。钕催化剂在七种稀土催化剂中具有较大的活性中心浓度,其值为2—3×10~(-2)mol/molNd。本文对稀土络合催化剂k_p的性质作了讨论。     

Synthesis, characterization, and catalytic activity of rare earth metal amides supported by a diamido ligand with a CH2SiMe2 link

A series of four coordinate rare earth metal amides with general formula ((CH2SiMe2)[(2,6- IPr2C6H3)N]2)LnN(SiMe3)2(THF) [(Ln = Yb(2), Y (3), Dy (4), Sm (5), Nd (6)] containing a diamido ligand (CH2SiMe2)[(2,6-iPr2C6H3)N]2(2-) with a CH2SiMe2 link were synthesized in good yields via reaction of [(Me3Si)2N]3Ln(III)(mu-Cl)Li(THF)3 with the corresponding diamine (CH2SiMe2)[(2,6-iPr2C6H3)NH]2 (1). All compounds were fully characterized by spectroscopic methods and elemental analyses. The structures of complexes 2, 3, 4, 5, and 6 were determined by single-crystal X-ray analyses. Investigation of the catalytic properties of the complexes indicated that all complexes exhibited a high catalytic activity on the cyclotrimerization of aromatic isocyanates, which represents the first example of cyclopentadienyl-free rare earth metal complexes exhibiting a high catalytic activity and a high selectivity on cyclotrimerization of aromatic isocyanates. The temperatures, solvents, catalyst loading, and the rare earth metal effects on the catalytic activities of the complexes were examined.     

三氟甲磺酸稀土催化ε-己内酯开环聚合

采用三氟甲磺酸稀土(镧、钕、铒)作为单组分催化剂催化了ε-己内酯的本体开环聚合反应. 考察了稀土元素种类、催化剂浓度、聚合时间及温度对单体转化率和聚合产物分子量的影响. 该类催化剂在催化聚合过程中具有单一活性中心, 且催化活性较高. 此聚合反应可能是通过阳离子活性末端链聚合机理进行的.     

Pt／Al_2O_3，Pd／Al_2O_3催化剂上CO氧化与表面氧脱出－恢复性能

Ｐｔ／Ａｌ_２Ｏ_３，Ｐｄ／Ａｌ_２Ｏ_３催化剂上ＣＯ氧化与表面氧脱出－恢复性能周仁贤，郑小明（杭州大学催化研究所，杭州３１００２８）关键词铂，钯，氧化铝，氧化锆，负载型催化剂，一氧化碳，氧化，氧脱附ＡＩ。Ｏ。负载的贵金属（Ｐｔ，Ｐｄ或Ｒｈ等）催化剂对有...     

Systematics and anomalies in rare earth/aluminum bromide vapor complexes: thermodynamic properties of the vapor complexes LnAl3Br12 from Ln = Sc to Ln = Lu

Systematics and anomalies in the rare earth/aluminum bromide vapor complexes have been investigated by the phase equilibrium-quenching experiments. The measurements suggest that the LnAl3Br12 complexes are the predominant vapor complexes for the 16 rare earth elements Ln = Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu in the temperature range 601-833 K and pressure range 0.01-0.22 MPa, which is different from the rare earth/aluminum chloride systems, where the predominant vapor complexes are LnAl3Cl12 from Ln = La to Ln = Lu, but LnAl2Cl9 for Ln = Sc and Y are roughly in the same ranges, which indicates the importance of the halogen anion radius on the rare earth vapor complex formation. In the temperature and pressure ranges, gaseous Al2Br6 and AlBr3 are dominant species and the molar fraction of LnAl3Br12 is normally less than 0.01. Thermodynamic functions of the reactions LnBr3(s) + (3/2)Al2Br6(g) = LnAl3Br12(g) were calculated from the measurements for the 16 rare earth elements and then smoothly interpolated for the radioelement Ln = Pm. The standard molar enthalpies and standard molar entropies show significant Gd divergences from LaAl3Br12 to LuAl3Br12 when plotted as functions of the rare earth atomic number. They also suggest nearly linear manner for ScAl3Br12, LuAl3Br12, YAl3Br12, and LaAl3Br12 when plotted as functions of the rare earth ionic radius.     

还原态WO_3/Al_2O_3,NiO/Al_2O_3和NiO-WO_3/Al_2O_3催化剂上H_2,CO,O_2的吸附特性

在加氢精制和许多其它催化过程中,Mo,W是主要的活性组分,Co,Ni通常作为助剂,有关Co-Mo体系的研究文献报导很多~[1.2], 但由于钨较难还原和硫化,关于