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Kwak, Ja Hun
Molecular Catalysis lab
Research Interests
  • Heterogeneous catalysis, molecular catalysis, ASlumima, zeolites

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The role of H2O in the carbonation of forsterite in supercritical CO2

Cited 38 times inthomson ciCited 36 times inthomson ci
Title
The role of H2O in the carbonation of forsterite in supercritical CO2
Other Titles
The role of H2O in the carbonation of forsterite in supercritical CO2
Author
Kwak, JahunHu, Jian ZhiTurcu, Romulus V. F.Rosso, Kevin M.Ilton, Eugene S.Wang, ChongminSears, Jesse A.Engelhard, Mark H.Felmy, Andrew R.Hoyt, David W.
Keywords
HIGH-RESOLUTION; GEOLOGICAL MEDIA; SEQUESTRATION REACTIONS; DISSOLUTION KINETICS; CLIMATE-CHANGE; DIOXIDE; OLIVINE; TEMPERATURE; MINERALS; AQUIFER
Issue Date
2011-07
Publisher
ELSEVIER SCI LTD
Citation
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL, v.5, no.4, pp.1081 - 1092
Abstract
The effect of variable H2O content on the carbonation of forsterite in supercritical CO2 (scCO(2)) at 80 degrees C and 76 bars (7.6 MPa) was investigated by a combination of NMR, XRD, TEM and XPS. When trace amounts of H2O were included, limited reaction was observed. Below H2O saturation in scCO2, reaction products were a mixture of partially hydrated/hydroxylated magnesium carbonates and hydroxylated silica species that were mainly in an amorphous state, forming a non-resolved layer on the forsterite surface. At H2O content above saturation, where forsterite was in contact with both a CO2-saturated aqueous fluid and H2O-saturated scCO(2), solid reaction products were magnesite (MgCO3) and an amorphous polymerized SiO2. Formation of these anhydrous phases implies H2O initially bound in precursor hydrated/hydroxylated reaction products was liberated, inducing further reaction. Hence, for a given fluid/mineral ratio there is a H2O threshold above which a significant portion of the H2O serves in a catalytic role where more extensive carbonation reaction occurs. Defining the role of H2O, even in low H2O content environments, is therefore critical to determining the long term impact of CO2 reactivity in the subsurface. (C) 2011 Elsevier Ltd. All rights reserved
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DOI
10.1016/j.ijggc.2011.05.013
ISSN
1750-5836
Appears in Collections:
ECHE_Journal Papers
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