Advanced Materials Research Vol. 1040

Abstract: The study results of mica bearing rocks from the Mamskoye and Kuletskoye deposits and the processes, involved in grinding and activating muscovite mica from the rocks using a ball and a planetary mills, a disintegrator and a pneumoimpulsive installation depending on different time intervals and other grinding factors, are presented in this paper. The resultant materials were examined by the methods of X-ray phase analysis, derivatography, microscopy and others, which resulted in drawing the conclusions concerning the applicability of different mechanical treatment methods applied in obtaining ground mica for various uses.

Abstract: The paper shows the effect of butylenes concentration in feedstock on the process of dehydrogenation of butane into butylenes using chromia-alumina-potassium catalyst. Butylenes as contained 1 to 7 % wt. in butane slip completely without hindering the process of converting of butane.

Abstract: Electrolytic deposit of indium, platinum and platinum-indium alloy on the surface of graphite electrodes has been studied using the scanning electron microscopy and the stripping voltammetry. The scanning electron microscopy method has revealed that platinum-indium alloy on the surface of the graphite electrode contains indium, platinum and chlorine. But platinum is unable to be determined on the surface of the graphite electrode without a metal activator due to its precipitation in very small quantities. Under the anodic oxidation of indium-platinum precipitation, the anodic peaks caused by the selective electro-oxidation of indium from the intermetallic compounds with platinum are observed on the current-voltage curves. Wherein, platinum remains on the electrode surface, and can be oxidized from the electrode at the potentials of the electrode purification (more than 1 V).

Abstract: This is a research on the hydrodesulphurization process of hydrogenate from the coal of Shubarkolsky deposit (Republic of Kazakhstan) in the presence of pyrite and natural zeolite. The rate constants for hydrodesulphurization process of the liquid products and Gibbs energy were calculated by the method of equilibrium kinetic analysis, which was necessary for improving the technological parameters for the hydrotreatment of liquid hydrogenation products. It is shown that the optimal time of the hydrodesulphurization process is 15-25 minutes. The sulfur content in the fraction up to 200⁰С is 0.043 %, and in a fraction of 200-3000С - 0.065 %, which indicates a high degree of hydrotreatment of the hydrogenate in the presence of the above mentioned catalyst.

Abstract: There are numerous advantages of building materials based on sulfur-bituminous binder. Using the sulfur-bituminous concretes in road construction leads to improved quality of pavements. In particular, there is an increase of resistance to rutting when extending the bituminous concretes with sulfur. The well-known difficulty limiting the widespread practical use of the sulfur-bituminous concretes is the emission of toxic gases – hydrogen sulfide and sulfur dioxide – which are formed during the manufacture and installation of sulfur-bituminous concrete. The present paper is devoted to the said problem. The survey of processes occurring in sulfur-bituminous mixtures is carried out. This allowed us to select most prospective suppressors for toxic gases emitted during the production and laying of sulfur-bituminous concrete. Series of laboratory tests are made to proof our choice. The results of tests confirm that oxides of amphoteric metals neutralizers are effective suppressors for hydrogen sulfide and sulfur dioxide, while carbon only slightly reduces the emissions. The emission is primarily depends on temperature and water content. Therefore, we recommend not to exceed 145 °C during the production and laying. Components for asphalt must be dehydrated, and sulfur must be degassed. If these requirements are met, than production process of sulfur-bituminous concrete will meet the safety requirements.

Abstract: Melamine formaldehyde composites have been synthesized with chlorides and micro- and nanoparticles of transition metals (Co, Ni, Cu) entered into polymer during the polycondensation of melamine with formaldehyde. The received composites were studied by the X-ray diffraction and scanning electronic microscopy and applied as catalysts to cathode activation in cyclohexanone electrohydrogenation. For composites of MF+MCl₂ it was established higher catalytic activity than for МF+М⁰.

Abstract: Here we report that ethylene-derived multi-walled carbon nanotubes (MWCNTs) can be successfully used in the “as prepared” form for the synthesis of Pt/MWCNTs catalysts in aqueous solutions without the need in special wetting agents or specific treatments. The MWCNTs strongly accelerate the hydrolysis of metal precursor, thereby allowing rapid deposition of Pt oxide under mild conditions. Upon reduction, Pt nanoparticles with uniform distribution over the carbon surface can be obtained, the particle size (2-5 nm) being dependent on BET surface area of MWCNTs (120-350 m²/g) and Pt loading (5-30 wt.% of Pt relative to MWCNTs).

Abstract: The modification of Silochrome C80 with copper(II), cobalt(II) and nickel(II) 8-oxyquinolinates complexes was carry out. The range of working temperatures, morphological structure, polarity and chromatographic properties of the obtained sorbents were investigated. New sorbents were used for analytical separation of ketone mixtures of normal and isomeric chain by gas chromatography.

Abstract: A new simple, universal and highly-efficient method of substituted semicarbazone, thiosemicarbazone and aminoguanidine synthesis in the presence of I₂ was developed. The method was used to obtain a range of products with the structures confirmed by ¹H NMR Spectra.

Abstract: Effective methods of synthesis of ethyl (4E)- and ethyl (4Z)-5-chloropent-4-enoates, the key precursors for various biologically active compounds were developed.