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Sabirzyanov, A. N.; Il’in, A. P.; Akhunov, A. R.; Гумеров, Ф. М.

doi:10.1023/a:1015294905132

Cited by 117 publications

(31 citation statements)

References 4 publications

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“…The density of CO 2 at 40 C and 100 bar was approximated from Bachu and Stewart [12] to be 600 Kg/m 3 and the solubility of water in scCO 2 at the same conditions was approximated to 0.5 mole% [13,14]…”

Section: Methodsmentioning

confidence: 99%

On the potential for CO2mineral storage in continental flood basalts – PHREEQC batch- and 1D diffusion–reaction simulations

2012

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Continental flood basalts (CFB) are considered as potential CO2 storage sites because of their high reactivity and abundant divalent metal ions that can potentially trap carbon for geological timescales. Moreover, laterally extensive CFB are found in many place in the world within reasonable distances from major CO2 point emission sources.Based on the mineral and glass composition of the Columbia River Basalt (CRB) we estimated the potential of CFB to store CO2 in secondary carbonates. We simulated the system using kinetic dependent dissolution of primary basalt-minerals (pyroxene, feldspar and glass) and the local equilibrium assumption for secondary phases (weathering products). The simulations were divided into closed-system batch simulations at a constant CO2 pressure of 100 bar with sensitivity studies of temperature and reactive surface area, an evaluation of the reactivity of H2O in scCO2, and finally 1D reactive diffusion simulations giving reactivity at CO2 pressures varying from 0 to 100 bar.Although the uncertainty in reactive surface area and corresponding reaction rates are large, we have estimated the potential for CO2 mineral storage and identified factors that control the maximum extent of carbonation. The simulations showed that formation of carbonates from basalt at 40 C may be limited to the formation of siderite and possibly FeMg carbonates. Calcium was largely consumed by zeolite and oxide instead of forming carbonates. At higher temperatures (60 – 100 C), magnesite is suggested to form together with siderite and ankerite. The maximum potential of CO2 stored as solid carbonates, if CO2 is supplied to the reactions unlimited, is shown to depend on the availability of pore space as the hydration and carbonation reactions increase the solid volume and clog the pore space. For systems such as in the scCO2 phase with limited amount of water, the total carbonation potential is limited by the amount of water present for hydration of basalt.

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Section: Methodsmentioning

confidence: 99%

On the potential for CO2mineral storage in continental flood basalts – PHREEQC batch- and 1D diffusion–reaction simulations

2012

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“…1b) on TEM grids when using only TEOS and HAc without additional water. In the sc-CO 2 system, water may accompany the CO 2 medium; CO 2 normally contains 1 x 10 -2 mole fraction of water at 50 o C and 200 atm [19]. Restricting the availability of water and moderating the hydrolysis rate can significantly improve the SiO 2 film quality.…”

Section: Discussionmentioning

confidence: 99%

Formation of Insulating Oxide Films with Hydrolysis Reactions of Alkoxide Precursors in Supercritical Fluid CO2: Chemistry, Morphology, Characterization and Film Thickness

et al. 2016

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Insulating silicon dioxide (SiO 2 ) films can be produced by hydrolysis of metal alkoxide tetraethylorthosilicate (TEOS) in the presence of an acid catalyst in supercritical fluid CO 2 (sc-CO 2 ). In this study, SiO 2 films are formed on different substrates using TEOS as a source of silicon, and acetic acid (HAc) as a catalyst. Water required for the hydrolysis reaction is from in situ generation of esterification and condensation reactions involving HAc and the alcohol produced. The acid catalyzed deposition reaction actually starts at room temperature but produces decent films in sc-CO 2 at moderately high temperatures (e.g. 50 o C). Supercritical fluid CO 2 is known to have near zero surface tension and provides an ideal medium for fabrication of SiO 2 films. Formation of SiO 2 films via hydrolysis reaction in sc-CO 2 is more rapid compared to the traditional hydrolysis reaction at room temperature. In general, metal alkoxide hydrolysis reactions carried out in a closed sc-CO 2 system is not affected by moisture in air compared with traditional open-air hydrolysis systems. Using sc-CO 2 as a reaction medium can eliminate undesirable organic solvents utilized in traditional alkoxide hydrolysis reactions.X-ray diffraction (XRD) and electron diffraction (ED) measurements demonstrated that the SiO 2 films produced are amorphous. Energy dispersive spectroscopy (EDS), attenuated total reflectance-Fourier transform infrared (ATR-FTIR) and X-ray photoelectron (XPS) spectroscopy show elemental compositions of the films formed on the substrate surfaces to be SiO 2 . Film thickness formation by controlling the amount of the catalyst is discussed.

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“…In this work, the equation of state (EOS) used to calculate the properties of the involved systems is the Soave‐Redlich‐Kwong (SRK) equation (Eq. ), widely accepted for supercritical fluid applications , .

true P = \frac{RT}{V - b} - \frac{a (T)}{V (V + b)}

…”

Section: Methodsmentioning

confidence: 99%

Design of a Cost‐Reduced Flexible Plant for Supercritical Fluid‐Assisted Applications

et al. 2018

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A novel batch plant for supercritical CO 2 applications is proposed which is not equipped with expensive components, such as high-pressure pumps, making it particularly suitable for bench-scale use. For the first time, the use of a hanging scale is suggested to weigh the amount of CO 2 required for the experiment and the use of the thermodynamics to reach the working conditions. The rig is able to cover different applications, e.g., aerogel drying, impregnation, and extraction, showing high flexibility. An approximate cost analysis has been performed considering as a reference a 150-mL vessel. It has been calculated that both the setup and running costs are considerably lower than the common batch and semicontinuous rigs.

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Cited by 117 publications

References 4 publications

On the potential for CO2mineral storage in continental flood basalts – PHREEQC batch- and 1D diffusion–reaction simulations

On the potential for CO2mineral storage in continental flood basalts – PHREEQC batch- and 1D diffusion–reaction simulations

Formation of Insulating Oxide Films with Hydrolysis Reactions of Alkoxide Precursors in Supercritical Fluid CO2: Chemistry, Morphology, Characterization and Film Thickness

Design of a Cost‐Reduced Flexible Plant for Supercritical Fluid‐Assisted Applications

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