排序方式: 共有37条查询结果,搜索用时 15 毫秒
1.
L. B. Belykh N. I. Skripov L. N. Belonogova V. A. Umanets F. K. Schmidt 《Kinetics and Catalysis》2010,51(1):42-49
The applicability of elemental phosphorus as a modifier of palladium catalysts for hydrogenation was demonstrated, and the
conditions for the synthesis of nanoparticles that are highly efficient in hydrogenation catalysis were optimized. The modifying
effect of elemental phosphorus depends on the P/Pd ratio; it is associated with changes in the catalyst dispersity and the
nature of the formed nanoparticles containing various palladium phosphides (PdP2, Pd5P2, and Pd6P) and Pd(0) clusters. The main stages of the formation of palladium catalysts for hydrogenation were determined, and a model
of an active catalyst, in which the Pd6P phosphide is the core of a nanoparticle and Pd(0) clusters form a shell, was proposed. 相似文献
2.
John W.Grove 《数学物理学报(B辑英文版)》2010,30(2):563-594
This article describes mathematical models for phase separated mixtures of materials that are in pressure and velocity equilibrium but not necessarily temperature equilibrium. General conditions for constitutive models for such mixtures that exhibit a single mixture sound speed are discussed and specific examples are described. 相似文献
3.
E. A. Datkova L. M. Dimova G. V. Ratovskii O. V. Tyukalova L. N. Belonogova G. I. Smirnov 《Russian Journal of Applied Chemistry》2012,85(8):1157-1162
The interrelation between the chemical composition, structure, and ion-exchange properties of tin(IV) phosphate modified with sodium hexanitrocobaltate was studied. The sorption capacity was increased; the possibilities for lithium, rubidium, and cesium sorption were extended owing to change in the size of cavities in the structure. 相似文献
4.
L. B. Belykh N. I. Skripov L. N. Belonogova V. A. Umanets F. K. Shmidt 《Russian Journal of Applied Chemistry》2007,80(9):1523-1528
The nature and properties of nanosized palladium hydrogenation catalysts modified with elemental phosphorus and phosphine (PH3) were studied. 相似文献
5.
G. I. Smirnov L. M. Dimova N. V. Chebunina G. V. Ratovskii L. N. Belonogova M. T. Munkueva 《Russian Journal of Applied Chemistry》2008,81(12):2099-2103
Correlation between the chemical composition, structure, and ion-exchange properties of tin(II) hydrophosphate was studied. 相似文献
6.
L. B. Belykh N. I. Skripov L. N. Belonogova A. V. Rokhin F. K. Shmidt 《Russian Journal of General Chemistry》2009,79(1):92-97
Reaction of palladium bisacetylacetonate with elemental phosphorus in an inert atmosphere is shown to proceed as a redox process forming palladium phosphides of different compositions: PdP2, Pd5P2, Pd4,8P, and Pd12P3,2. The conversion of Pd(acac)2 and the composition of palladium phosphides formed in benzene is established to be affected by water. A tentative scheme of the formation of palladium phosphides is suggested. 相似文献
7.
N. I. Skripov L. B. Belykh L. N. Belonogova V. A. Umanets E. N. Ryzhkovich F. K. Schmidt 《Kinetics and Catalysis》2010,51(5):714-723
The effect of the nature of the acido ligand in the precursor and the modifying action of elemental phosphorus on palladium
catalysts for hydrogenation are reported. The large turnover frequency (TOF) and turnover number (TON) values observed for
styrene hydrogenation on the Pd blacks prepared in situ by PdCl2 reduction with hydrogen in DMF are due to the formation of fine-particle catalyst with a base particle size of 6–10 nm. This
is explained by the high PdCl2 reduction rate and by the formation of a palladium cluster stabilizer—dimethylammonium chloride—in the reaction system via
the catalytic hydrolysis of the solvent (DMF). The modifying action of elemental phosphorus on the properties of the palladium
catalysts depends on the nature of the acido ligand in the precursor. In the case of oxygen-containing precursors at small
P/Pd ratios, elemental phosphorus exerts a promoting effect, raising the TON and TOF values by a factor of about 9. In the
case of palladium dichloride as the precursor, white phosphorus exerts an inhibiting effect. At the same time, it enhances
the stability of the catalyst, raising the TON value at P/Pd = 0.3. The causes of these distinctions are considered. 相似文献
8.
A. V. Kulikov V. R. Bogatyrenko O. V. Belonogova L. S. Fokeeva 《Russian Chemical Bulletin》1999,48(12):2267-2272
The effect of dioxygen on the width of ESR lines of powders and films of polyaniline was studied at 15–300 K. It was found
that the line broadening can decrease or increase, which corresponds to strong or weak exchange, respectively. For dry polyaniline
powders and films, maxdimum broadening was observed at 240 K. The findings were explained by spin exchange during collisions
of a mobile polaron with immobile O2 molecules bound to the polymer. The values of exchange interaction between the O2 molecule and the polaron and the mobility of the polarons along the polymer chain were found. The mobility of polarons along
the polymer chains decreases in the presence of H2O, and dioxygen predominantly adds to the imine N atom.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 2293–2297, December, 1999. 相似文献
9.
Kulikov A. V. Bogatyrenko V. R. Belonogova O. V. Fokeeva L. S. Lebedev A. V. Echmaeva T. A. Shunina I. G. 《Russian Chemical Bulletin》2002,51(12):2216-2223
Powders, solutions, and films of polyanilines synthesized by three methods of aniline oxidative polymerization were studied by ESR, optical spectroscopy, and X-ray diffractometry. Polyanilines under study were shown to differ in the degree of polaron delocalization along solitary polymer chains in a solution, the packing density in powders and films, the mobility of polarons, and the degree of crystallinity. The conductivity of films correlates only with the characteristic time () of O2 diffusion into amorphous regions of the films. These times were determined from the kinetics of changes in the ESR line intensities after admission of O2. The higher the film conductivity, the greater the value and the sizes of the amorphous regions. The electroconductivity of the films is likely determined by the mobility of polarons in boundary regions between the amorphous regions rather than within the amorphous regions: the larger the sizes of the amorphous regions, the less the number of low-conducting contacts between the amorphous regions and the higher the conductivity. 相似文献
10.
V. L. Gein O. V. Bobrovskaya E. A Mashkina V. V. Novikova R. R. Makhmudov A. N. Yankin S. E. Danilov E. A. Hvolis V. D. Belonogova D. K. Gulyaev 《Russian Journal of General Chemistry》2020,90(5):822-826
A series of new methyl (2Z)-4-aryl-2-{4-[(4,6-dimethylpyrimidin-2-yl)-sulfamoyl]phenylamino}-4-oxobut-2-enoates
was synthesized by the reaction of methyl esters of aroylpyruvic acids with
2-(4-aminobenzenesulfamido)-4,6-dimethylpyrimidine in a mixture of acetic
acid–ethanol (1 : 1). The obtained 4-oxobut-2-enoates reacted with silver
nitrate in ethanol–DMF (2 : 1) to form their silver salts. The antimicrobial
activity of the compounds was studied. 相似文献