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 language | English (US) |
|---|---|
| Pages (from-to) | 6314-6319 |
| Number of pages | 6 |
| Journal | Environmental Science and Technology |
| Volume | 43 |
| Issue number | 16 |
| DOIs | |
| State | Published - Aug 15 2009 |
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ASJC Scopus subject areas
- Chemistry(all)
- Environmental Chemistry
Cite this
Reaction mechanisms for enhancing mineral sequestration of CO2 . / Jarvis, Karalee; Carpenter, Ray; Windman, Todd; Kim, Youngchul; Nunez, Ryan; Alawneh, Firas.
In: Environmental Science and Technology, Vol. 43, No. 16, 15.08.2009, p. 6314-6319.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Reaction mechanisms for enhancing mineral sequestration of CO2
AU - Jarvis, Karalee
AU - Carpenter, Ray
AU - Windman, Todd
AU - Kim, Youngchul
AU - Nunez, Ryan
AU - Alawneh, Firas
PY - 2009/8/15
Y1 - 2009/8/15
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=68849115583&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=68849115583&partnerID=8YFLogxK
U2 - 10.1021/es8033507
DO - 10.1021/es8033507
M3 - Article
C2 - 19746731
AN - SCOPUS:68849115583
VL - 43
SP - 6314
EP - 6319
JO - Environmental Science & Technology
JF - Environmental Science & Technology
SN - 0013-936X
IS - 16
ER -