期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 49, 期 7, 页码 4724-4734出版社
AMER CHEMICAL SOC
DOI: 10.1021/es506065d
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资金
- U.S. Department of Energy, Office of Fossil Energy
- Pacific Northwest National Laboratory's Carbon Sequestration Initiative part of a Laboratory Directed Research and Development Program
- American Chemical Society
- University of Wyoming (UW)
- UW School of Energy Resources
Subsurface injection of CO2 for enhanced hydrocarbon recovery, hydraulic fracturing of unconventional reservoirs, and geologic carbon sequestration produces a complex geochemical setting in which CO2-dominated fluids containing dissolved water and organic compounds interact with rocks and minerals. The details of these reactions are relatively unknown and benefit from additional experimentally derived data. In this study, we utilized an in situ X-ray diffraction technique to examine the carbonation reactions of forsterite (Mg2SiO4) during exposure to supercritical CO2 (scCO(2)) that had been equilibrated with aqueous solutions of acetate, oxalate, malonate, or citrate at 50 degrees C and 90 bar. The organics affected the relative abundances of the crystalline reaction products, nesquehonite (MgCO(3)(.)3H(2)O) and magnesite (MgCO3), likely due to enhanced dehydration of the Mg2+ cations by the organic ligands. These results also indicate that the scCO(2) solvated and transported the organic ligands to the forsterite surface. This phenomenon has profound implications for mineral transformations and mass transfer in the upper crust.
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