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.
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.
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.