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- W2783170643 abstract "The carbonation of silicates in water-bearing supercritical CO2 (scCO2) can affect the performance of CO2-enhanced subsurface operation. This study investigated the effects of water, temperature, and pressure on the carbonation of wollastonite (CaSiO3) in water-bearing scCO2 at 35–93 °C, 25–125 bar, and from dry conditions to 140 times more water than needed for saturation (140 × Sw). The extent of reaction increased with more water, higher pressure, and interestingly, lower temperature. In addition, for the first time, we report on water-bearing scCO2–silicate reactions for samples with varying prior histories of water saturation conditions, temperature, and pressure. For a sample initially reacted at 100% water saturation (1 × Sw) and then with 45 × Sw, the final reaction extent was smaller than the sample reacted only with 45 × Sw. Similarly, for a sample initially reacted at 60 °C and then at 35 °C, the reaction extent was smaller than for a sample reacted only at 35 °C. In contrast, for a sample initially reacted at 50 bar and then at 100 bar, the reaction extent was the same as for a sample reacted only at 100 bar. The amorphous silica layers formed on the particle surfaces are more permeable with more water and lower temperature, and are not affected by pressure. These findings provide new insights into the extent to which water-bearing scCO2–silicates reactions depend on environmental conditions and the reactions' impacts on subsurface CO2 injection." @default.
- W2783170643 created "2018-01-26" @default.
- W2783170643 creator A5000701998 @default.
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- W2783170643 date "2018-04-01" @default.
- W2783170643 modified "2023-09-29" @default.
- W2783170643 title "Wollastonite carbonation in water-bearing supercritical CO2: Effects of water saturation conditions, temperature, and pressure" @default.
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- W2783170643 doi "https://doi.org/10.1016/j.chemgeo.2018.01.012" @default.
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