- A tartaric acid copper-zirconium compound and its preparation method and application (by machine translation)
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The invention discloses a tartaric acid copper-zirconium compound, the preparation comprises the following steps: to tartaric acid as the raw material, first with nitric acid copper reaction preparing tartaric acid copper, with the nitrate by the reaction of the tartaric acid copper-zirconium compound. Its structural formula is as follows: the invention is mainly applied in the propellant as a combustion catalyst and instability in the combustion plans the preparation. (by machine translation)
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Paragraph 0025; 0036; 0040; 0044
(2017/08/25)
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- Synthesis, characterization and thermal behaviour on solid tartrates of some bivalent metal ions
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Solid-state M-L compounds, where M stands for bivalent Mn, Fe, Co, Ni, Cu, Zn and L is tartrate, have been synthesized. Thermogravimetry and differential thermal analysis (TG-DTA), differential scanning calorimetry (DSC), X-ray powder diffractometry, infr
- Rodrigues, Emanuel C.,Carvalho, Claudio T.,de Siqueira, Adriano B.,Bannach, Gilbert,Ionashiro, Massao
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p. 156 - 160
(2010/01/30)
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- Effects of the size of nano-copper catalysts and reaction temperature on the morphology of carbon fibers
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In this study, carbon fibers with different morphologies, including coiled carbon nanofibers and straight carbon fibers, were obtained by the chemical vapor deposition using a Cu-catalytic pyrolysis of acetylene at 250 °C. The influences of nano-copper catalyst particle size and the reaction temperature on the morphology of carbon fibers were investigated. Under the same reaction condition, coiled carbon nanofibers generally were synthesized using nano-copper catalyst with smaller particles size, and bigger copper particles are apt to produce straight carbon fibers. With decreasing of reaction temperature to 200 °C, straight carbon fibers were obtained, instead of coiled carbon nanofibers at 250 °C. The product was characterized by field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and X-ray powder diffraction (XRD).
- Zhang, Qian,Yu, Liyan,Cui, Zuolin
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p. 735 - 742
(2008/10/09)
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- Copper/zinc L-tartrates: Mixed crystals and thermolysis to a mixture of copper oxide and zinc oxide that is catalytically active in methanol synthesis
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The system consisting of copper/zinc L-tartrate mixed crystals has been systematically explored in the whole range from pure copper tartrate to pure zinc tartrate. Mixed crystal L-tartrates were prepared and their thermochemical behaviour under oxygen was investigated. Oxidic precatalysts (CuO/ZnO) for catalytic tests in methanol synthesis were prepared by mild thermolysis of the mixed tartrates in air at 300°C. Catalytic tests were performed with a multi-channel parallel reactor. The catalytic activity shows a maximum at about equal amounts of copper and zinc whereas the specific surface area (BET surface) increases strongly when going from CuO to ZnO. This system offers a convenient, inexpensive route to CuO/ZnO precatalysts with adjustable compositions that avoids all other metals during preparation. Wiley-VCH Verlag GmbH & Co. KGaA, 2006.
- Weiss, Rainer,Vukojevi?, Sascha,Baltes, Christian,Naumann d'Alnoncourt, Raoul,Muhler, Martin,Epple, Matthias
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p. 4782 - 4786
(2008/03/14)
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- Synthesis and equilibrium studies of mixed-ligand complexes of Co(II), Ni(II), and Cu(II) with some aliphatic dicarboxylic acids and creatinine
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Ternary mixed-ligand metal complexes [M(L1)(L2) 2](H2O)n, where M = Co(II), Ni(II), or Cu(II), L1 = the dianion of succinic, malic, or tartaric acid, and L 2 = creatinine, were synthesized and characterized using microchemical and thermal analyses, molar conductance, infrared, and electronic spectral measurements. A square-planar structure is suggested for the Co(II) and Cu(II) ternary complexes, whereas Ni(II) ternary complexes have tetrahedral stereochemistry. Formation constants of the binary and ternary complexes in such systems were determined by pH-metric titrations at 25 ± 0.1°C and at a constant ionic strength I = 0.1 M (KNO3). The stability of the various complexes was discussed in terms of the nature of both the ligands and metal ions. The thermodynamic functions (ΔH, ΔG, and ΔS°) associated with the complex formation of [Cu(II) + aliphatic acids + creatinine] were also determined and examined.
- Ahmed, Iman T.
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p. 523 - 540
(2008/10/09)
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- Effect of synthesis method of nanocopper catalysts on the morphologies of carbon nanofibers prepared by catalytic decomposition of acetylene
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Carbon fibers, prepared by metal-catalyzed decomposition of hydrocarbons, e.g., acetylene, benzene, and methane, present various growth models including whisker-like, branched, bi-directional, and multidirectional types of growth. The addition of additives or a second metal to the metal catalyst, the use of a support, the pretreatment of the catalyst, and the catalyst source may have considerable effects on carbon deposition. Carbon nanofibers were synthesized by the decomposition of acetylene with nanocopper catalysts to determine the effects of synthesis method on the morphologies of carbon nanofibers obtained. Copper nanoparticles catalyzed the carbon deposition of acetylene to yield regularly coiled fibers with a novel symmetric growth type, whereas ribbon-like fibers formed over nanocopper particles prepared by hydrogen-arc plasma method. The copper nanocrystals changed from irregular or spherical shape to faceted shapes after fiber growth. The regularity of the shapes of the faceted catalyst particles included in the fibers accounted for the different morphologies of the resulting products.
- Qin, Yong,Zhang, Qian,Cui, Zuolin
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p. 389 - 394
(2008/10/09)
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- Transition metal complexes of dibenzoyl-L-tartaric acid (db-L-tarH2) and L-tartaric acid (L-tarH2) ; X-ray crystal structure of {[Cu(L-tar) (phen)] · 6H2O}n (phen = 1,10-phenanthroline)
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Dibenzoyl-L-tartaric acid (db-L-tarH2) reacts with [Cu2(μ-O2CCH3)4(H 2O)2] to form the tartrate complex [Cu(L-tar)] (1) (L-tarH2 = L-tartaric acid). 1 reacts with 2,2′-bipyridine (bipy) and 1,10-phenanthroline (phen) yielding [Cu(L-tar)(bipy)] · 6H2O (2) and [Cu(L-tar)(phen)] · 4H2O (3), respectively. A crystal of composition {[Cu(L-tar) (phen)] · 6H2O}n (4) was taken directly from the original mother liquor of 3. The X-ray crystal structure of the polymeric complex 4 shows each copper(II) ion to be six-coordinate, being chelated by a phenanthroline ligand and also chelated by a carboxylate oxygen atom and a hydroxyl oxygen atom from one end of a tartrate group. A carboxylate oxygen atom and a hydroxyl oxygen atom from one end of a symmetry-related tartrate ligand also chelates to the metal. Dibenzoyl-L-tartaric acid also reacts with [Mo2(μ-O2CCH3)4], [Mo2(CH3CN)8][BF4]4, {[Ru2(μ-O2CCH3)4Cl]}n and Na4[Rh2(μ-CO3)4] · 2.5H2O to give {[Mo2(db-L-tar)2] · 5H2O}n (5), [Mo2(db-L-tar)(CH3CN)4][BF4] 2 · 7H2O (6), {[Ru2(db-L-tar)2.5] · 2H2O}n (7) and {[Rh2(db-L-tar)2(H2O)2] · H2O}n (8), respectively.
- McCann, Malachy,Humphreys, Fergal,McKee, Vickie
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p. 3655 - 3661
(2008/10/09)
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- Complex Formation in Solutions of Copper and Calcium Tartrates
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Based on the results of potentiometric titration of aqueous solutions of calcium and copper tartrates, the occurrence of the [CaHL]+ and [CaL]0 complexes with the thermodynamic stability constants (log K) of 2,65 ± 0.25 and 3.15 ± 0.15, respectively, and the [CuHL]+, [CuL]0, and [Cu(OH)L]- complexes (log K 3.54 ± 0.36, 4.40 ± 0.12, and 13.7 ± 0.3, respectively) was established. The thermodynamic solubility constants of calcium tartrate CaC4H6O6 · 4H2O (pKs = 6.41 ± 0.25) and copper tartrate CuC4H6O6 · 3H2O (pKs = 7.66 ± 0.06) were determined. Analysis of the experimental data was carried out with the use of a mathematical model, which made it possible to estimate the probability of the occurrence of a wide range of complexes in solutions, to choose the complexes that sufficiently reproduce the situation observed, to determine the values of their stability constants, and to obtain a quantitative description of the regularities observed.
- Ponizovskii,Studenikina,Mironenko
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p. 558 - 563
(2008/10/08)
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- Thermoanalytical study of some salts of 3d metals with d-tartaric acid
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The processes of dehydration and decomposition of the Mn(II), Fe(II), Co(II), Ni(II), Cu(II) and Zn(II) salts of d-tartaric acid were studied by using TG, DTG and DTA methods in air or in argon, and also IR-spectroscopy. The equations of thermal decomposi
- Dranca,Lupascu,Sofransky,Popa,Vass
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p. 1403 - 1412
(2008/10/08)
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- Metal(II) d-Tartarates Catalyzed Asymmetric Ring Opening of Oxiranes with Various Nucleophiles
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The asymmetric ring opening of meso-2,3-disubstituted oxiranes with thiols, aniline, and trimethylsilyl azide was studied by the use of metal(II) d-tartarates as heterogeneous chiral Lewis acid catalysts.The enantioselectivity varied widely with the combination of oxirane, nucleophile, and metal(II) d-tartarate, and Zn(II) d-tartarate gave the best enantioselectivity in the respective reactions of 1,2-epoxycyclohexane with 1-butanethiol, aniline, and trimethylsilyl azide to afford the corresponding adducts in 85, 58, and 42 percent ee, respectively.Furthermore, the kinetic resolution of racemic oxiranes with thiols catalyzed by Zn(II) d-tatratate was studied.
- Yamashita, Hiroyuki
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p. 1213 - 1220
(2007/10/02)
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