ICP光谱法测定碳负载金属催化剂中金属的含量

采用ICP光谱法测定Ru/C、Rh/C、Pd/C、Pt/C、Cu/C、Fe/C、Ni/C、Mn/C、Re/C和Au/C等10种碳负载催化剂中金属元素的含量。对照了采用高温灰化消解、微波消解和HNO3+HClO4酸消解3种样品前处理方法对分析结果的影响。3种方法在各自适用范围内的测定结果均符合定量分析的要求,但HNO3+HClO4酸消解法操作简便快捷,可以快速准确测定Pd/C、Pt/C、Cu/C、Fe/C、Ni/C、Mn/C和Re/C等催化剂中的金属含量。     

复合氧化物催化剂

本发明提供了一种复合氧化物催化剂，所述复合氧化物催化剂含有包含Mo、V、成分X和含有硅石的载体的催化剂颗粒。所述成分X是选自碱土金属元素和稀土元素的至少一种元素。     

金属元素(单质)蒸气压的计算式

导出一个汁算金属元素(单质)蒸气压的半经验式,用该式计算了70种金属元素单质在其熔点至沸点温度区间不同温度所对应的蒸气压,并与文献中已有的蒸气压数据作了对比。所导出的公式为:P=e~{12.63[1-(T_b)/T]}     

柴油机油金属元素含量分析与取样方法的研究

本文所述是柴油机油金属元素含量分析研究的一部分。其中阐述各种分析法、油样取样方法、取样部位、取样器具等的作用．另外还对取样状态和取样周期及操作因素对研究结果的影响。     

硫酸体系中镍锌分离的实验研究

探讨了用碱浸法从硫酸体系中分离镍锌.实验根据不同金属沉淀pH值的差异,用NaOH溶液调节控制pH值除去有害杂质铁;利用金属元素镍和锌的氢氧化物在化学性质上的差异,用NaOH溶液碱浸分离镍和锌.实验结果表明,除铁彻底,镍锌分离也彻底,锌酸钠溶液中镍含量可低至2 mg/L.     

Structure and Bonding in Some Gd（Ⅲ） Metal Complexes Studied by Three-Dimensional X-Ray Analysis and ^155Gd Mossbauer Spectroscopy

Some functional lanthanide metal complexes, such as acetylacetonato complexes, ethylenediaminetetraacetato complexes, were successfully applied for diagnostic technique. The authors are interested in investigating the structure and bonding in lanthanide and actinide metal complexes using 166Er, t55Gd, and 237Np Mtissbauer spectroscopies in connection with single-crystal and/or powder X-ray diffraction, making clear the differences on their structures as well as the differences in the participation of 4f and 5f orbitals in the chemical bonds. In this article, the crystal structures of two novel Gd（Ⅲ） acetylacetonato complexes, Gd（pta）3 · 2H2O （pta = 1,1,1 -trifluoro-5,5-dimethy 1-2,4-hexanedione） and Gd（bfa）3 · 2H2O （bfa = 1, 1, 1 -trifluoro-4-phenyl-2-4-butanedione） were reported. Though both of them were dihydrate and had distorted square antiprismatical structure, Gd（pta）3 · 2H2O crystallizes in the P 2 1/n （#14） monoclinic space group and its lattice parameters are a = 1.4141（6） nm, b = 1.0708（3） nm, c =2.2344（4） nm, β =952.4（2）°, and Gd（bfa）3· 2H2O crystallizes in P 212121 orthorhombic space group and its lattice parameters were a = 1.322 （1） nm, b = 2.295 （1） nm, c = 1. 0786（8） nm. In the meantime, the authors had finished a systematic investigation on the ^155Gd Mossbauer isomer shift （δ） of various Gd（Ⅲ） metal complexes having a different coordination number （C.N.） and different ratios coordinating oxygen to nitrogen. A tendency for the 6 value to decrease with an increase in the C.N, and the number of the nitrogen atom coordinating to Gd was confirmed. This indicated that the Gd-O and/or Gd-N bond in the investigated Gd（Ⅲ） metal complexes had a small covalent contribution, which was possible to be deduced from the O and/or N atoms of the lisands donating electrons to 6s, 5d, and 4f orbitals of Gd.     

Synthesis and Characterization of Some Lanthanide（Ⅲ） Complexes with 4- [N-（2-methoxy benzylinine）formy1]-2, 3-dimethyl-1-phenyl-3-pyazolin-5-one

A series of seven novel lanthanide（Ⅲ ） nitrato complexes with 4-[ N-（2-methoxybenzylimine）formyl] 1-2, 3- dimethyl-1-phenyl-3-pyazolin-5-one （2mbfa）, were synthesized. These complexes were characterized by elemental analysis, molecular mass determination, conductance and magnetic moment measurements, IR, UV-visible, and ^13CNMR spectral studies, In these complexes, the Schiff base, 2mbfa, acts as neutral bidentate ligand by utilizing the carbonyl oxygen and azomethine nitrogen as donor sites. All the three nitrate ions are also coordinated unidentately with 7 coordination for the lanthanide（Ⅲ） ions with a tentative monocapped octahedral geometry for the complexes. All the seven lanthanide（Ⅲ） complexes have a general formula, [ Ln（2mbfa）：（NO3）3 ].     

Contrasting REE Signatures on Manganese Ores of Iron Ore Group in North Orissa, India

The distribution pattern of Rare Earth Elements （REE） in three categories of manganese ores viz. stratiform, stratabound-replacement, and detrital of Precambrian Iron Ore Group from north Orissa, India was reported. These categories of Mn-ore differed in their major and trace chemistry and exhibited contrasting REE signature. The stratiform ores were relatively enriched in ∑REE content （697 μg·g^-1） and their normalized pattern showed both positive Ce and Eu anomalies, whereas the stratabound-replacement types were comparatively depleted in ∑REE content （211 μg·g^-1） and showed negative Ce and flat Eu signatures. The detrital categories showed mixed REE pattern. The data plotted in different discrimination diagrams revealed a mixed volcaniclastic and chemogenic source of material for stratiform categories, and LREE （Light Rare Earth Elements） and HREE （Heavy Rare Earth Elements） are contributed by such sources, respectively. In contrast, the stratabound ore bodies were developed during the remobilization of stratiform ores, and associated Mncontaining rocks under supergene condition followed by the redeposition of circulating mineralized colloidal solutions in structurally favorable zones. During this process, some of the constituents were found only in very low concentration within stratabound ores, and this is attributed to their poor leachability/mobility. The detrital ores did not exhibit any significant characteristic in respect of REE as their development was via a complex combination of processes involving weathering, fragmentation, recementation, and burial under soil cover.     

Thermochemical Study on Ternary Solid Complex of La（Gly）2（Ala）3Cl3·2H2O（s）

The complex of lanthanum chloride with Glycine and Alanine,La(Gly)2(Ala)3Cl3·2H2O,was synthesized and characterized by IR,elementary analysis,thermogravimetric analysis,and chemical analysis.The dissolution enthalpies of LaCl3 ·7H2O(s),2Gly(s) 3Ala(s)and La(Gly)2(Ala)3Cl3 ·2H2O(s)were determined in 2 mol·L-1 HCl by a solution-reaction isoperibol calorimeter.By designing a thermochemical cycle in terms of Hess' Law and through calculation,the reaction enthalpy of lanthanum chloride seven-hydrate with Glycine and Alanine was obtained:ΔrHθm(298.15 K)=(29.652±0.504)kJ·mol-1,and the standard enthalpy of formation of La(Gly)2(Ala)3Cl3·2H2O(s)ΔfHθm [La(Gly)2(Ala)3Cl3·2H2O,s,298.15 K]=-4467.6±8.3 kJ·mol-1.     

拍照王者三星SGH-G800

作为全球第一款支持3倍光学变焦的5D0万像素拍照手机，三星G800在造型上延续了同门G600的滑盖款式，并借助金属元素和镜面设计等流行元素的使用让手机在整体上给人精致和华美的感觉。而为了获得更好的拍照性能，三星G800这次没有刻意强化超薄机身，而是通过“双面设计”整体概念，综合合理的按键布局，在操作上更接近真正的数码相机。