Abstract
Processes that occurred in the mechanical activation of MSiO3 silicates (M = Mg, Ca, Sr) in a centrifugal planetary mill in the atmosphere of carbon dioxide (p(CO2) = 105 Pa) were comparatively studied. The interaction of carbon dioxide with silicates had the character of deep mechanosorption with massed penetration of gas molecules into the volume of particles and their “solution” in structurally disordered silicate matrices in the form of distorted CO 2−3 ions. No individual carbonate phases were formed. The absorbing ability of silicates with respect to carbon dioxide decreased in the series SrSiO3 > CaSiO3 > MgSiO3. The carbon dioxide mechanosorption coefficients K MS were calculated for Mg, Ca, and Sr silicates according to the earlier suggested kinetic model. A linear dependence of logK MS on Δr G o298 for the transformation of silicates into the corresponding carbonates was observed.
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Original Russian Text © A.M. Kalinkin, E.V. Kalinkina, 2010, published in Zhurnal Fizicheskoi Khimii, 2010, Vol. 84, No. 9, pp. 1737–1743.
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Kalinkin, A.M., Kalinkina, E.V. The mechanosorption of carbon dioxide by magnesium, calcium, and strontium metasilicates. Russ. J. Phys. Chem. 84, 1585–1591 (2010). https://doi.org/10.1134/S0036024410090256
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DOI: https://doi.org/10.1134/S0036024410090256