Reaction mechanisms for enhancing mineral sequestration of CO2

Karalee Jarvis, Ray Carpenter, Todd Windman, Youngchul Kim, Ryan Nunez, Firas Alawneh

Research output: Contribution to journalArticle

49 Scopus citations

Abstract

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

Original languageEnglish (US)
Pages (from-to)6314-6319
Number of pages6
JournalEnvironmental Science and Technology
Volume43
Issue number16
DOIs
StatePublished - Aug 15 2009

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

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