Publications by authors named "Christine Holzammer"
Article Synopsis
- The study investigates how different salts (NaCl, KCl, MgCl, and CaCl) affect the formation of carbon dioxide gas hydrates by examining their thermodynamic inhibition effects.
- Experiments were conducted in a high-pressure vessel, focusing on the changes in the water-rich phase, such as the reaction enthalpy and CO2 solubility prior to hydrate formation.
- The findings indicate that while reaction enthalpy and CO2 solubility correlate with the effective mole fraction of salts, the growth rate of solid hydrates remains unaffected by the presence of salts.
J Phys Chem B
September 2017
Article Synopsis
- The study investigates how carbon dioxide (CO) gas hydrates are formed and dissociated using Raman spectroscopy, particularly focusing on the role of sodium chloride/water solutions with varying salinities.
- During the formation, solid hydrate and a liquid water-rich phase coexist, and the researchers measured the proportions of each phase based on the hydroxyl (OH) vibration signature in the hydrate gel.
- The findings reveal a linear relationship between the salinity of the initial solution and the amount of hydrate formed, as well as the presence of micro- and nanoscale liquid CO droplets after the hydrate dissociates, which may explain the observed "memory effect."
Article Synopsis
- An experimental study using Raman spectroscopy shows that adding sodium chloride to CO2-hydrate systems reduces the thermodynamic drive for hydrate formation.
- Measurements revealed that at a high concentration of 20 wt% salt, the temperature for hydrate formation drops by 12 K, and both molar enthalpy and entropy of reaction decrease by 50% and 20%, respectively.
- The study also found that the solubility of carbon dioxide in the water phase decreased by 70% with high salinity, indicating multiple mechanisms at work in inhibiting hydrate formation compared to existing literature.
