Reaction mechanisms for enhancing mineral sequestration of CO2.

摘要: Storage of CO2 through mineral sequestration using olivine has been shown to produce environmentally benign carbonates. However, due the formation a rate-limiting reaction product layer, rate is insufficient for large-scale applications. We report results altering reactant solution composition and resultant mechanism enhance rate. The products were analyzed total carbon content with thermal decomposition analysis, phase compositions Debye-Scherrer X-ray powder diffraction (XRD), surface morphology scanning electron microscopy (SEM), energy dispersive spectroscopy (EDXS). Carbon analysis showed that an increase in bicarbonate ion activity increased carbonate conversion fastest rate, 63% one hour, occurred 5.5 M KHCO3. Additionally, SEM confirmed when was increased, magnesium particles significantly both number density size passivating-reaction layer exfoliation augmented.