title: Note: Solution NMR probe for the study of CO2 sequestration at elevated pressure and temperature.
abstract: Nuclear magnetic resonance is widely employed in studies of chemical reactions and molecular motions at moderate pressure and temperature, but for CO(2) solutions under supercritical conditions encountered in geological or mineral sequestration (pressures to 150 atm and temperatures to 150 °C) a specialized variable-temperature probe is required. The critical component of such a probe is its pressure chamber, and our working design is presented along with examples of its use in (13)C NMR measurements of bicarbonate and dissolved CO(2) fractions as functions of time, following initial pressurization to 70 atm. Also shown are final, steady-state values of these fractions as functions of temperature from 50 to 125 °C at 70 atm.
authors.affiliation: Department of Physics, Arizona State University, Tempe, Arizona 85287-1504, USA.
authors.forename: J
authors.initials: J
authors.lastname: Diefenbacher
authors.forename: J
authors.initials: J
authors.lastname: Piwowarczyk
authors.forename: R F
authors.initials: RF
authors.lastname: Marzke