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排序方式: 共有108条查询结果,搜索用时 31 毫秒
1.
A. A. Akhrem A. V. Kamernitskii V. A. Krivoruchko R. P. Litvinovskaya I. G. Reshetova 《Russian Chemical Bulletin》1976,25(6):1306-1309
1. | Together with the cis-hydroxylation of the 16-bond, the hydroxylation of the 3-acetates of the ethyl esters of 24-nor- and 21,24-dinorchola-5,16,20(22)-trien-3-ol-23-oic acids with aqueous KMnO4 inpyridine gives the 3,16, 22-triol 17,20-epoxides and their acetates. |
2. | The hydroxylation of the 21,24-dinor analogs with 30% H2O2 solution in the presence of OsO4 leads to a complex mixture of profoundly oxidized reaction products that are identified with difficulty. Only saponification of the carbethoxyl grouping occurs when alkaline H2O2 solution is used for the epoxidation. |
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V. I. Zheivot T. A. Nikoro V. N. Krivoruchko L. I. Panina L. G. Pinaeva L. A. Isupova 《Journal of Analytical Chemistry》2007,62(12):1170-1175
Peculiarities of the determination of nitrogen oxides and ammonia in the reaction products of ammonia oxidation are studied by gas chromatography. Particular attention was paid to the sampling problem. It is shown that in the course of the transportation of samples containing nitrogen(II) oxide and oxygen, the oxidation of nitrogen(II) oxide to nitrogen(IV) oxide takes place in the vapor phase. The conditions were found for suppressing or even eliminating the gas-phase reaction of NO oxidation to NO2. A procedure for the gas-chromatographic analysis of the reaction products in the catalytic oxidation of ammonia is proposed using several samples and packed columns, including the determination of NO with respect to NO2 formed in the gas-phase oxidation of NO. 相似文献
4.
V. M. Mastikhin O. P. Krivoruchko B. P. Zolotovskii R. A. Buyanov 《Reaction Kinetics and Catalysis Letters》1982,18(1-2):117-120
The possible use of the27Al-NMR method with sample rotation at a magic angle to study the local environment and cation distribution of Al(III) ions in the oxide lattice are exemplified by -, -, -, -Al2O3 and commercial A-1 A1(III) oxide.
-, , -, -Al2O3 Al(III) A-1 27 Al Al(III) ë .相似文献
5.
O. P. Krivoruchko B. P. Zolotovskii L. M. Plyasova R. A. Buyanov V. I. Zaikovskii 《Reaction Kinetics and Catalysis Letters》1982,21(1-2):103-108
Phase composition of the products of Al(III) hydroxide ageing at 473 K is shown to be independent of pH. Under these conditions boehmite is always formed whose morphological structure is determined by both the phase composition of freshly precipitated Al(III) hydroxides and the pH of their ageing. A possibility for the formation of needlelike boehmite crystals whose width coincides with the value of b=12.3Å of its unit cell, has been shown.
Al(III) 473 pH, . Al(III), pH . , b=12,3 Å .相似文献
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V. Yu. Gavrilov O. P. Krivoruchko T. V. Larina I. Yu. Molina R. A. Shutilov 《Kinetics and Catalysis》2010,51(1):88-97
The distribution of copper- and nickel-containing components in the pore space of HZSM-5 zeolite was quantitatively studied. It was found that the detailed distribution of a modifier in the micropore and mesopore volumes of the zeolite depends on both the chemical nature of the modifier and the conditions of supporting and the regime of M2+ polycondensation in the pore space of the zeolite. The experimental data on the low-temperature adsorption of nitrogen on Cu(n)ZSM-5 catalysts can be interpreted as the result of the partial filling of the zeolite micropore space (10 vol %) and the finest mesopores with D < 3 nm with the modifier. In the case of Ni(n)ZSM-5 catalysts, the penetration of the modifier into zeolite channels (micropores) in detectable amounts was not found, and it was arranged in mesopores on the surface of zeolite crystallites. The reason for differences between modifier distributions in the pore structure of the zeolite was explained from the standpoint of different structures of copper and nickel polyhydroxo complexes in impregnating solutions after polycondensation. It was found that, in the Cu(n)ZSM-5 and Ni(n)ZSM-5 catalysts, the modifier component contained copper and nickel only in a doubly charged state and mainly octahedral oxygen environments. In this case, three-dimensional nanoparticles or coarsely dispersed particles of CuO were not detected in the pore space of the support, whereas the presence of a small amount of sufficiently large NiO crystals with a coherent-scattering region of 80–100 nm was detected in Ni(n)ZSM-5, and these crystals occurred on the surface of zeolite crystals. It was found that the apparent density of a copper-or nickel-containing component arranged in the pore space of the zeolite was lower than the density of the bulk CuO and NiO phases by a factor of ~3 and 4, respectively, because of the size effect. 相似文献
10.
V. N. Krivoruchko 《Journal of Experimental and Theoretical Physics》1997,84(2):300-308
The formation of the superconducting phase in short-period proximity-effect layered superlattices of the superconductor-band-antiferromagnetic-metal
(SC/AF) type is studied. The exact solution of the Usadel equations is used to discuss the possibility of formation in such
structures of a ground state in which the order parameters of the adjacent superconducting layers have opposite signs (the
“π-phase”). The dependence of the superconducting transition temperature and the upper critical field normal to the layers on
the lattice period, the intensity of magnetic interaction in the antiferromagnetic layer, and the state of the interface between
the layers is examined. It is found that there exists a nonlinear dependence of the conditions for the appearance of the superconducting
state in a layered SC/AF system on the system’s parameters. Finally, the conditions for the appearance of the superconducting
phase in proximity-effect superlattices consisting of a superconductor with nonmagnetic, ferromagnetic, and antiferromagnetic
metals are compared.
Zh. éksp. Teor. Fiz. 111, 547–561 (February 1997) 相似文献