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稀土催化材料的应用及研究进展 总被引:10,自引:9,他引:10
介绍了稀土催化材料在石油化工,化石燃料催化燃烧、机动车尾气的催化净化,有毒有害废气的治理,Cl化工、固体氧化物燃料电池及移动制氢、稀土催化理论研究等方面的应用和研究现状,并就稀土催化材料研究中存在的问题和稀土催化材料的发展进行了思考和展望。 相似文献
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催化动力学光度法测定痕量铜的研究进展 总被引:4,自引:0,他引:4
综述了近年来国内外催化动力学光度法测定痕量铜的进展情况。对催化氧化动力学光度法、催化还原动力学光度法、催化荧光光度法、阻抑动力学光度法等几个类别,从反应介质、灵敏度、线性范围等方面介绍了对不同反应体系的研究情况,并对催化动力学光度法测定痕量铜的发展趋势做出预测。 相似文献
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采用程序升温氧化(TPO)技术和吸附 催化氧化循环实验,研究了金属担载量对CuO/AC催化-吸附剂干法催化氧化苯酚的影响。结果表明,随着金属担载量的增加,CuO/AC催化-吸附剂的苯酚催化氧化活性升高,并且苯酚与催化-吸附剂之间的相互作用增强,使吸附的苯酚不易脱附/降解脱附。同时,CuO/AC催化 吸附剂自身的烧蚀活性也随金属担载量的增加而升高。对于吸附-干法催化氧化法而言,CuO/AC存在一个较佳的金属担载量范围,该范围以Cu的质量分数计为3%~5%。 相似文献
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催化不对称Michalel加成反应的新进展 总被引:5,自引:0,他引:5
总结了近年催化不对称Michael加成反应的新方法,包括手性金属络合物催化 的反应,呈手性Lewis酸性的手性金属络合物促进的不对称加成,手性冠醚络合物 催化的反应及其它催化反应。 相似文献
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新型含硅聚芳醚酮的合成与表征 总被引:5,自引:0,他引:5
对FeBr3/Me6TREN催化的反向原子转移自由基聚合进行了研究。在不同的催化剂、引发剂的配比、聚合温度和配体用量等条件下,该催化体系催化的MMA聚合反应动力学为一级反应。聚合物分子量可控,分子量分布很窄,说明该体系催化的聚合反应为活性可控聚合,通过实验计算了反应的活化能,并利用UV光谱对催化剂进行了研究。 相似文献
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线型间甲酚-甲醛树脂中亚甲基桥与羟基的相对位置不同,其性能有很大不同。我们用IR法测定785cm~(-1)和855cm~(-1)处的吸光度——A_(725)和A_(856),用其比值A_(785)/A_(855)测定线型间甲酚-甲醛-树脂中亚甲基桥的邻-对位比。 相似文献
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Kotelnikov G. V. Moiseyeva S. P. Mezhburd E. V. Krayev V. P. 《Journal of Thermal Analysis and Calorimetry》2000,62(1):39-50
A scientific and technical solution of capillary calorimetric unit design is described based on a method of separating the
sensitive volume of calorimetric cells with a heat-conducting bridge in a differential titration calorimeter.
The design of the calorimetric cells as thin capillary tubes allowed to minimize the dimension of the heat-conducting bridges
and to separate with high accuracy the sensitive volume of the calorimetric cells which is of 78.5 μl. Due to high calorimeter
power sensitivity (10 nW) a modern level of requirements for measuring minimum specific heat of processes is provided.
The adopted design of the calorimetric cells permits to possess the cells located horizontally and to simplify the solution
of the problem of equalizing components concentration along the volume of the calorimetric cells.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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The copper(II) polymer Cu(2-qic)Cl (2-qic = quinoline-2-carboxylate) was synthesized and then characterized by X-ray crystal structure determination, spectroscopic and magnetic studies. The crystal structure consists of copper(II) ions with two different chromophores: four-coordinated in a square-planar geometry and five-coordinated in an environment between square-pyramidal and trigonal-bipyramidal. The copper ions are bridged sequentially through the carboxylate groups in a syn–anti conformation, forming an infinite one-dimensional zigzag chain with two alternating non-equivalent copper(II) chromophores. The chloride atom acts as a single chloro-bridge link to adjacent chains, forming a ribbon type structure (1D). The variable-temperature (1.8–300 K) magnetic susceptibility data of the complex were interpreted with the dimer law using the molecular field approximation. The results obtained indicate a very weak ferromagnetic (J2 = 0.37 cm−1) interchain interaction through the syn–anti carboxylate bridge. A relatively strong antiferromagnetic interaction, transmitted through the chloro-bridge with an exchange coupling of J1 = −57.0 cm−1, dominates the magnetic properties of this complex. The magnitude and the nature of the exchange coupling are explained on the basis of the structural results. 相似文献
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A μ1,1,3 formic bridging Ni2 complex [Ni3(HCOO)6·H2O]]n 1 has been synthesi-zed under hydrothermal conditions. The single-crystal X-ray diffraction analysis shows that 1 exhibits a 3D open microporous tube formed by covalent and coordination bonds. Complex 1 crystallizes in the monoclinic system, space group P21/c with a = 11.1487(13), b = 9.7763(11), c =17.9685(17) A, β= 126.948(6)°, C6H6Ni3O13, Mr = 462.02, V = 1565.2(3) A3 Z = 4, Dc= 1.961 g/cm3, μ = 3.630 mm-1, F(000) = 917.7, Rint = 0.0234, the final R = 0.0234 and wR = 0.0734 for 3469 observed reflections (Ⅰ>2σ(Ⅰ)). 相似文献
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Reactions between and bidentate phosphines (dppm and dppe) produced complexes and with chelating dppm and dppe ligands as only products. No bridging bidentate phosphine complex was observed. Both complexes were spectroscopically characterized. 相似文献
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JONES电导池系统的交流阻抗由电极过程的相关阻抗和电极间溶液的电阻两部分组成,可用适当的等效电路模拟。采用LCR电桥测量JONES电导池中溶液的电阻时需要选择合适的等效电路为模型解析测量的交流阻抗。通过等效电路的分析发现,选择串联电路作为LCR电桥的解析等效电路测量JONES型电导池中溶液的电阻时引入的误差比并联电路小。 相似文献
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《Journal of Coordination Chemistry》2012,65(5):916-927
A mixed-valence 2-D Cu(I/II) complex, [{Cu(II)(dmen)(μ-Cl)(μ1,5-dca)}{Cu(I)(μ1,5-dca)}]n (1) (dmen = N,N-dimethylethylenediamine, dca = dicyanamide = [N(CN)2]?), has been synthesized by in situ partial reduction of Cu(II) to Cu(I) using benzoin (2-hydroxy-1,2-di(phenyl)ethanone) as reductant. Complex 1 was characterized by spectroscopic techniques, single crystal X-ray diffraction, and low temperature magnetic measurements. Structural investigation reveals that 1 represents a mixed-valence 2-D coordination polymer formed by parallel 1-D [Cu(II)(dmen)(Cl)Cu(I)(μ1,5-dca)2]n chains running along the b axis, where chloride bridges Cu(II) ions of adjacent polymers through long connections (2.8401(1) Å) to form a 2-D network. The metal centers have two different geometrical environments (distorted square pyramidal and distorted trigonal planar geometries for Cu(II) and Cu(I), respectively). The Cu(II) ions in [Cu(II)(dmen)(μ-Cl)(dca)]n are interconnected through single chloride bridges while within the [Cu(I)(μ1,5-dca)]n units, the dca connects adjacent Cu(I) ions through μ1,5-dca bridges. Magnetic susceptibility measurements reveal weak ferromagnetic interactions (J = +0.3 cm?1) within the chlorido-bridged Cu(II) regular chain present in 1. Simultaneous presence of μ1,5-dca and single chlorido bridges with ferromagnetic coupling is believed to be unique in mixed-valence Cu(I)/Cu(II) complexes. 相似文献