Time filter

Source Type

Fedyaeva O.N.,RAS Kutateladze Institute of Thermophysics | Antipenko V.R.,RAS Institute of Petroleum Chemistry | Vostrikov A.A.,RAS Kutateladze Institute of Thermophysics
Journal of Supercritical Fluids | Year: 2014

The conversions of sulfur-rich asphaltite (the gross-formula CH 1.23N0.017S0.037O0.01) in supercritical water (SCW) flow at 400 C, 30 MPa without and with addition of aluminum and zinc shavings to asphaltite have been studied. At SCW conversion of asphaltite without addition of metals the yields of volatile and liquid products were found to be equal to 10.3 and 46.0%, respectively. The amount of oil in the liquid product was by 1.6 times higher than that in raw asphaltite. Hydrogen evolution during the oxidation of (Al) and (Zn) by supercritical water provided for the hydrogenation of asphaltite in situ. When (Al) and (Zn) were added, the portion of the insoluble conversion residue decreased from 44.5 up to 11.3 and 26.3%, respectively. The degree and efficiency of asphaltite hydrogenation with addition of (Al) were higher than the ones with addition of (Zn). The amount of O-containing substances in the products and the conversion residue was found to have increased as compared with raw asphaltite. At conversion without addition of metals, the bulk of oxygen was mainly concentrated in the conversion residue, while with addition of (Al) and (Zn) it was detected in the composition of CO and CO2. According to the GC-MS, IR and NMR 1H spectroscopy data, addition of metals to asphaltite resulted in decrease in the content of sulfoxides and carbonyl-containing substances and in increase in the content of polyaromatic substances in the liquid products. When (Al) was added to asphaltite, more than 70% of sulfur passed into H2S and when (Zn) was added, more than 60% of sulfur passed into ZnS. © 2014 Elsevier B.V.

Taran Y.A.,National Autonomous University of Mexico | Kliger G.A.,RAS Institute of Petroleum Chemistry | Cienfuegos E.,National Autonomous University of Mexico | Shuykin A.N.,RAS Institute of Petroleum Chemistry
Geochimica et Cosmochimica Acta | Year: 2010

This paper reports the isotope effects in an open-system Fischer-Tropsch type (FTT) synthesis, with implications for the origin of natural abiogenic hydrocarbons. The starting form of carbon was CO2, with carbon and hydrogen isotopic compositions measured for products of catalytic hydrogenation of CO2 on iron and cobalt catalysts (FTCO2-Fe and FTCO2-Co) at 350 and 245°C, respectively, and 10MPa. The carbon isotopic composition of the resulting saturated hydrocarbons (alkanes) as a function of carbon number shows a positive trend for both FTCO2-Fe and FTCO2-Co, with a fractionation of 2-4‰ and 3-6‰ between CH4 and C2H6 over the Fe and Co catalysts, respectively. The unsaturated hydrocarbons (alkenes) do not show any trend. A strong kinetic isotope fractionation (>40‰) occurred between CO2 and CH4 in both experiments. The hydrogen isotope fractionation between alkanes appeared to be similar to that found in natural (thermogenic and biogenic) gases, with enrichment in deuterium of longer hydrocarbon chains; the dominant H/D fractionation occurred between CH4 and C2H6. Alkenes in the products of the FTCO2-Fe reaction are enriched in deuterium (~50‰) and do not show any trend versus carbon number. We suggest that other than FTT reactions or a simple mixing are responsible for the occurrence of the inverse isotopic trends in both δ13C and δD found in light hydrocarbons in some terrestrial environments and meteorites. © 2010 Elsevier Ltd.

Novoselova L.Y.,RAS Institute of Petroleum Chemistry
Powder Technology | Year: 2016

X-ray diffraction and Fourier-transform IR spectroscopy techniques were employed to confirm that heavy-tonnage iron-removal sludge wastes could be successfully used to synthesize hematite nanopowder (HM NP) with an average particle size of 42nm. The sizes of the HM NP particles were confirmed from the TEM images. The hematite particles mostly exhibit elongated irregular oval shapes and their sizes vary within 18-74nm, with a dominant fraction at 42-46nm. The obtained HM NPs were characterized by a saturation magnetization of ~1.5emu/g and a remanent magnetization of ~0.9emu/g. Low-temperature nitrogen adsorption measurements showed that the obtained powder had a large specific surface area (S=14m2/g) and well-developed mesoporosity (average pore size, 17.2nm). A comparison of the obtained results to data from other researchers suggests that this hematite powder has high potential for use in the preparation of sorbents for water purification. © 2015 Elsevier B.V.

Novoselova L.Yu.,RAS Institute of Petroleum Chemistry
Journal of Alloys and Compounds | Year: 2014

A molybdenum trioxide micropowder (MoO3 MP) with an average crystallite size of 821 nm was obtained by the thermal treatment of an initial molybdenum nanopowder (Mo NP) with an average crystallite size of 150 nm. The structure of these powders and their resistance to carbon monoxide action at an increased temperature were studied by X-ray diffraction, X-ray fluorescence, and IR spectroscopy. The Mo NP sample contained 88.25% molybdenum and 11.51% oxygen and, as a whole, showed resistance to CO action at 200 °C. However, its crystallites were observed to grow under the specified conditions, and their final average size exceeded 1000 nm. The obtained MoO3 MP sample contained 67.50% molybdenum and 32.34% oxygen. Mo2C, Mo and Mo 4O11 were identified in addition to MoO3 after a treatment with CO at 200 °C. It is concluded that the MoO3 MP is unstable under the action of carbon monoxide at the indicated temperature. It is suggested that a dissociative sorption of CO involving MoO3 occurs. © 2014 Elsevier B.V. All rights reserved.

Novoselova L.Yu.,RAS Institute of Petroleum Chemistry
Russian Journal of Physical Chemistry A | Year: 2012

Samples of composite nanomaterials obtained by the thermal treatment of mixtures of MoO 3 nano-dispersed powder and ultrafine powder of Mo with precipitate from removing iron from groundwater are studied by means of X-ray diffraction and infrared spectroscopy. The structure of these samples (phase composition, average crystallite size, microdistortions (microstresses) of their crystal lattices, and certain texture parameters) are determined. It is suggested that under certain conditions, shells from the nanoparticles of Mo and/or MoO 3 are formed on the surface of sediment particles, preventing the identification of iron-containing phases. Estimates are made of the sorption activity of some materials with respect to carbon monoxide (CO). © Pleiades Publishing, Ltd., 2012.

Novoselova L.Y.,RAS Institute of Petroleum Chemistry
Powder Technology | Year: 2013

This work deals with studying the composition, structure, and sorbability of the water deironing precipitate sample thermally treated at 850. °C (WDP-850) with respect to carbon monoxide.According to the data of X-ray fluorescence (XRF) spectroscopy, WDP-850 contains 44.14% of iron, 6.29% of silicon, and 34.78% of oxygen.The results of X-ray diffraction (XRD) analysis indicate the presence of Fe2O3, Fe3O4, and SiO2 nanocrystallites (~11.4, 30.6, and 8.0%, respectively).The studies performed via the temperature-programmed desorption of CO show that WDP-850 can sorb carbon monoxide at 25 and 200. °C.The composition and structure of the precipitate sample obtained after CO adsorption at 200. °C (WDP-850-CO) have also been studied.According to XRD data, nearly 9.3% of the silicon carbide (SiC) phase with the moissanite's structure has appeared in the material.The SiC phase is supposed to result from the dissociative adsorption of CO on the surface of WDP-850.It has been concluded that WDP can be used as a base for the synthesis of functional materials, for example, CO sorbents. © 2013 Elsevier B.V.

Kuvshinov I.,RAS Institute of Petroleum Chemistry
16th European Symposium on Improved Oil Recovery 2011 | Year: 2011

Modeling results, which allow making a conclusion about potentialities of componentwise gel injection, for avoiding of an early gelation near the wellbore in hot wells, are presented in the article. Standard methods of gel injection imply using of homogeneous gel-forming composition, with component mixing on a surface just before injection, or even earlier, at a phase of chemicals production. It is not always acceptable, because the gelation process can start inside or near the wellbore, but the technology needs to form a gel shield at certain distance from a well. The model presented in this work, describes a consecutive injection of two or more different component solutions into a well. The mixture of these components produces gel at a reservoir temperature. Component mixing occurs as a result of a fluid dispersion and ions holdup by the rock matrix during filtration. A distance to the gel shield can be controlled by component and water volumes variation. Results of physical laboratory experiments, confirming the model assumptions, are given.

Novoselova L.Yu.,RAS Institute of Petroleum Chemistry
Russian Journal of Physical Chemistry A | Year: 2011

Nanomaterials obtained by treatment of ultradisperse molybdenum powder in air at 25-650°C were studied by X-ray diffractometry. Changes in the phase composition, mean size of crystallites, microdistortions (microstresses), crystal lattices of crystallites, and texture were investigated. © 2011 Pleiades Publishing, Ltd.

Antipenko V.R.,RAS Institute of Petroleum Chemistry | Melenevskii V.N.,Russian Academy of Sciences
Petroleum Chemistry | Year: 2012

Volatile products of the two-step (400, 650°C) flash pyrolysis of Ivanovskoe asphaltite from Orenburg oblast, its asphaltenes, oils, and benzene and benzene-ethanol resins have been characterized by gas chromatography-mass spectrometry (GCMS) in the on-line mode. The "unresolvable complex mixture" of nonidentifiable compounds prevails at both temperatures. The compositions of identified compounds in the products obtained at 400 and 650°C substantially differ, especially, for resins and asphaltenes. At 650°C, the products for all the samples are characterized by the same set of compounds including homologues of alkanes; α-olefins; cyclohexanes; pregnanes and steranes, cheilanthanes and hopanes; hopenes; mono-, bi-, and tri-cyclic aromatic hydrocarbons; and benzo- and dibenzothiophenes. This finding confirms that most of these compounds occur in the "bound" form as structural units of molecules of resinous-asphaltenic components of the natural asphaltite. © Pleiades Publishing, Ltd., 2012.

Antipenko V.R.,RAS Institute of Petroleum Chemistry
Petroleum Chemistry | Year: 2012

By means of gas chromatography-mass spectrometry, information has been obtained on the composition and relative abundance of alkanes; alkenes; steranes; hopanes; mono-, di-, tri-, and tetrasubstituted alkylbenzenes; naphthalene; phenanthrene; and benzo- and dibenzothiophenes in oils isolated from the products of aquathermolysis of high-sulfur natural asphaltite in a flow reactor in the temperature range of 200-575°C. © Pleiades Publishing, Ltd., 2012.

Loading RAS Institute of Petroleum Chemistry collaborators
Loading RAS Institute of Petroleum Chemistry collaborators