(Vestsi Natsiyanalnai Akademii Navuk Belarusi)
SERIES OF CHEMICAL SCIENCES
Published by The Belaruskaya Navuka Publishing House, Minsk, Republic of Belarus
| Proceedings of the National Academy of Sciences of Belarus (Vestsi Natsiyanalnai Akademii Navuk Belarusi) SERIES OF CHEMICAL SCIENCES Published by The Belaruskaya Navuka Publishing House, Minsk, Republic of Belarus |
Summary: Peculiarities have been investigated of titanium dioxide formation on aluminium surface in an aqueous solution of titanium (IV) tartrate by an anodic spark oxidation.
Rakovich E.V., Sviridov V.V.
Formation of high-dispersed nickel--boron phase by electroless Ni (II) reduction by borohydride. pp. 9--14.
Summary: Effect of various factors on chemical and phase composition, structure and morphology of nickel -- boron powders prepared by electroless deposition in aqueous solutions using sodium borohydride as a reducing agent has been studied.
Shevchuk V.V., Voitenko A.I., Mozheiko F.F.
Stufy of oil-in-water emulsions adsorption on Na-montmorillonite in salt media. pp. 15--19.
Summary: Adsorption data are presented for of oil-in-water emulsions adsorbed on a surface of Na-montinorillonite. An adsorption value increases in a saturated salt solution (NaCl, KCl) as compared to an aqueous solution while main sorption peculiarities are the same for both solutions.
Summary: Kinetic and activation parameters of wood lignin thermal decomposition have been determined in mesitylene (0.001--0.1 mol/l) in the temperature range from 423 to 733 K. The process has been shown to be described by an equation of the first order on an initial lignin concentration. Three basic stages of the process may be classified with time by a temperature variation. These stages arc methanolic, phenolic and solid phase formation stage. A free-radical mechanism of lignin thermolysis has been proposed and discussed. An approach developed shows promise in recycling of wood wastes.
Matys V.G., Zharskii I.M., Matveiko N.P., Poplavskii V.V.
Effect of method of barrier layer preparing and thermal treatment on the activity of composition electrodes. pp. 28--33.
Summary: Effect of preparing procedure parameters on the activity of a two-layer electrode system based on titanium has been investigated in a reaction of hydrogen evolution. A transport rate of hydrogen ions to platinum sites in the inner part of active layer has been shown using a combination of cyclic voltammetry measurements with quasi-static polarisation curves to be the same order of magnitude as a rate of heterogeneous process on the platinum sites.
Lazareva T.G., Shitik I.G. †, Gaiduk Yu.S.
Magnetic and magnetorheological properties of fluid compositions based on barium and strontium ferrites, and iron oxide. pp. 34--38.
Summary: Magnetic and magneto-rheological properties of a number of compositions have been examined. The compositions are based on barium and strontium ferrites, magnetite and g-Fe2O3 suspended in a transformer oil and synthetic binders based on phenol-formaldehyde, epoxyacrylic and pentaphthalic resins. Influence of numerous factors such as a type and magnetic properties of the filter, a binder type. composition magnetic properties on an orientation effect of the filter in a magnetic field has been evaluated. Orientation effect was estimated using magnetorheatogical effect value.
Lubliner I.P., Shchurevich O.A.
Preparation and properties of a fibrous carbon ion-exchanger. pp. 39--43.
Summary: Properties of a fibrous carbon ion-exchanger produced by a chemical modification of cellulose hydrate with phosphoric acid have been studies in a presence of carbamide or ammonium diphosphate.
Stepanova E.A., Ratko A.I., Bolotnikova E.V., Chistova T.A.
Sorption-structural and acidic properties of co-precipitated alumina-carbonate tripoly samples. pp. 44--51.
Summary: Mixed samples of tripoly-alumina type based on Belarusian natural carbonate tripoly have been prepared by co-precipitation technique, tripoly content varying from 0 to 100%. The samples of Al2O3 (30 wt%) + tripoly (70 wt%) are characterized by a higher value of a limit sorption volume (0.27--0.28 cm3/g) as compared to the initial compounds. A calcination of this sample at 700 °C leads to a homogeneous porous sorbents having pore size of 30 A° and limit sorption volume of 0.29 cm3/g.
Kuvaeva Z.I., Lopatik D.V., Prokopovich T.M., Pokrovskaya A.I., Zalesskaya E.G.
Salts and complexes based on amino acids. pp. 52--57.
Summary: Salts and complexes have been synthesized based on DL-asparagine acid and glycine with the following metals Al, Fe, Ca, Cu, Co, K, Mg, Mn, Na, Ni, Zn and Cr. Interaction of metal salts with amino acids has been investigated depending on pH value of water media. Complex formation constants have been calculated.
Soldatov V.S., Elinson I.S., Mishkina L.I., Omelchenko T.N., Tsygankov V.I.
Cr (VI) sorption on fibrous anionites. pp. 58--65.
Summary: Investigation of kinetics and dynamics of Cr (VI) ions sorption on a fibrous FIBAN AK-22 anionite showed a principle possibility of its application as a non-woven needle-punched filter material in a frame apparatus.
Bashmakov I.A., Solov'eva L.V., Tikhonova T.F., Kaputskii F.N.
Micro structure of YBa2Cu3O7-s formed during thermal conversion of salt forms of tricarboxy cellulose. pp. 66--70.
Summary: YBa2Cu3O7-s micro structure prepared by a thermal solid phase conversion of YBa2Cu3-salts of tricarboxy cellulose taken in a form of individual monofibres with different filling degree of Y3+, Ba2+, Cu2+ ions in a cationite phase. A diameter of the ceramic fibre and a crystallite size have been shown to be determined by a content of Y3+, Ba2+, Cu2+ ions in the ionite phase. Using a precursor with a low filling degree (a minimal filling degree of Y3+, Ba2+, Cu2+ ions in tricarboxy cellulose phase was 0.05 mmol/g, the stoichiometry being maintained as "1--2--3") a "design" of a permanent low dimension chain has been obtained consisting of practically individual YBa2Cu3O7--s-crystallites oriented along the fibre axis.
Kovalenko N.A., Sidorovich V.M., Shunkevich A.A., Egiazarov Yu.G.
Hexene-1-hydrogenation in the presence of Pd catalysts based on fibrous FIBAN K-1 ionites. pp. 71--75.
Summary: Pd immobilized on fibrous sulfocationic-exchange resin catalyzes hexene-1 hydrogenation under mild conditions. A hydrogenation activity depends on Pd content, functional groups concentration and a cationic form of sulfocationic-exchange resin.
Komarov V.S., Stepanova E.A., Shavel A.I., Chistova T.A.
Acidic properties of clays activated by phosphoric acid. pp. 76--81.
Summary: Acidic properties of the activated clay have been investigated by IR-spectroscopy depending on a time of its activation by 20 % phosphoric acid and thermal treatment. Initial clay has been shown to have Lewis acidic sites only. Bronstid acidic sites appeared in the case of phosphoric acid activation, their concentration increased with the activation time. Lewis acidity predominated on the sample suface at a higher calcination temperature (500 °C).
Komarov V.S., Repina N.S., Shavel A.I.
Effect of clay ultrasonic treatment on a rate of its acidic activation. pp. 82--86.
Summary: Effect of clays ultrasonic triatment and action of surface active substances alongside with ultrasound on activation by bicomponent acidic solutions have been studied. Ultrasound has shown to decrease an activation time and to bncrease substantially a sorption capacity and specific surface of the substances obtained. Surface active substances prevent a coagulation of despersed particles, increase a degree of their dispersion and solubility. Mechanism of activation andultrasound effect has been considered and experimintal results have been discussed.
Summary: 3-acetyl-4-carene (4-acetyl-4,7,7-trimethylbicyclo[4.1.0]hept-2-ene) has been established to be one of the main reaction products of peracetic acid with 4-acetoxymethyl-2-carene. This ester yields in 3,7,7-trimethyl-1,3,5-cycloheptatriene under solvolysis conditions.
Tarasevich V.A., Tereshko A.V., Kozlov N.G.
Catalytic synthesis of 3-alkylpyridines. pp. 90--102.
Summary: A review is devoted to well-known synthetic routes of 3-alkylpyridines preparation including methods of pyridine ring formation from acyclic fragments such as a cyclization of aliphatic and unsaturated aldehydes with ammonia, a condensation of acetylene and its derivatives with ammonia, and methods of 3-alkylpyridine synthesis on the base of nitrogen-containing heterocyclic compounds such as pyridine alkylation and piperidines dehydrogenation. The data on a reactivity dependence on reagent structure and catalysts used have been considered. Aspects of practical application of 3-alkylpyridines synthesis, 3-picolines in particular, has been discussed.
Summary: Hardening process and properties of compositions based on phosphate binders and finedispersed fraction of wood processing has been investigated. A preliminary impregnation of a filler with phosphoric acid solution has been shown to improve physico-chemical properties of the compositions prepared and to enhance their fire-resistance.
Kosmacheva T.G., Ariko N.G., Agabekov V.E., Verbitskii V.V.
Effect of oxidation solution content on iodine dyeing of polyvinyl alcohol films. pp. 107--113.
Summary: Potassium iodide oxidation has been investigated in aqueous solutions containing (NH4)2S2O8, CuSO4, KJ, KCl and H2SO4 which are used for iodine dyeing of polyvinyl alcohol films. The reaction proceeds via mixed complexes formation between an oxidizer ((NH4)2S2O8), a catalyst (CuSO4) and iodine-ions. In the active catalytic complex a ratio of (NH4)2S2O8: CuSO4 is 1:1. Potassium chloride being added into oxidation solution decreases iodine transfer from a film bulk into solution.
Mozheiko F.F., Domovskaya T.G.
Modification effect of hydrolyzed polyacrylonitrile on glay-salt dispersions. pp. 114--118.
Summary: A possibility has been shown to use a mixture of hydrolyzed polyacrylonitrile with HMC as a reagent-modificator in KCl flotation. KCl content in a flotation concentrate corresponds to the standard potassium fertilizer.
Summary: Chemical analysis and ESR-spectroscopy have shown that real humic substances are formed just within the first year of peat-forming plants humification in bogs medium.
Elovicheva Ya.K.
Peculiarities of sedimentogenesis in late glacial and holocene period within the territory of Belarus. p. 124.
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