FT-IR study of CO2 interaction with Na+ exchanged montmorillonite

Abstract

a b s t r a c tCarbon capture, utilization and storage (CCUS) in saline reservoirs in sedimentary formations has the potential to reduce the impact of fossil fuel combustion on climate change by reducing CO 2 emissions to the atmosphere and storing the CO 2 in geologic formations in perpetuity. At pressure and temperature (PT) conditions relevant to CCUS, CO 2 is less dense than the pre-existing brine in the formation, and the more buoyant CO 2 will migrate to the top of the formation where it will be in contact with cap rock. Interactions between clay-rich shale cap rocks and CO 2 are poorly understood at PT conditions appropriate for CCUS in saline formations. In this study, the interaction of CO 2 with clay minerals in the cap rock overlying a saline formation has been examined using Na + exchanged montmorillonite (Mt) (Na + -STx-1) (Na + Mt) as an analog for clay-rich shale. Attenuated Total Reflectance-Fourier Transform Infrared Spectroscopy (ATR-FTIR) was used to discern mechanistic information for CO 2 interaction with hydrated (both one-and two-water layers) and relatively dehydrated (both dehydrated layers and one-water layers) Na + -STx-1 at 35°C and 50°C and CO 2 pressure from 0-5.9 MPa. CO 2 -induced perturbations associated with the water layer and Na + -STx-1 vibrational modes such as AlAlOH and AlMgOH were examined. Data indicate that CO 2 is preferentially incorporated into the interlayer space, with relatively dehydrated Na + -STx-1 capable of incorporating more CO 2 compared to hydrated Na + -STx-1. Spectroscopic data provide no evidence of formation of carbonate minerals or the interaction of CO 2 with sodium cations in the Na + -STx-1 structure.Published by Elsevier B.V.

ATR-FTIR study of the interaction of CO2 with bacterial cellulose-based membranes

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On sorption and swelling of CO2 in clays

“…Permanent trapping of CO 2 in the interlayer of Naexchanged smectite (Na-SWy-2), potentially as carbonates, was also indicated in the work by Hur et al (2013) and Romanov (2013) from Fourier-transform infrared spectroscopy (FTIR) and X-ray diffraction data. However, CO 2 trapping in clays was not observed in a number of other studies: Krukowski et al (2015) using FTIR on Na-exchanged (Na-STx-1), and Schaef et al (2012) on Ca-exchanged (Ca-STx-1) Texasmontmorillonite using thermo gravimetric analysis, as well as Loring et al (2012), also on the same Caexchanged samples using a variety of methods, such as magic angle spinning nuclear magnetic resonance spectroscopy and attenuated total reflection infrared spectroscopy. These measurements were performed at 50°C and pressures up to 18 MPa.…”

A review of geochemical–mechanical impacts in geological carbon storage reservoirs

“…Intercalated CO 2 molecules are rotationally constrained and do not appear to react with water to form bicarbonate or carbonic acid. Krukowski et al . studied the interaction of CO 2 with hydrated (both 1W and 2W layers) and relatively dehydrated (both dehydrated and 1W layers) Na‐MMT via ATR‐FTIR spectroscopy.…”