Abstract
MgO sorbents doped with alkali-metal carbonates have been shown to exhibit improved sorption capacities at both low and moderate operating temperatures, compared to pure MgO sorbents. However, the mechanism of how alkali-metal carbonates enhance the CO2 sorption is not well understood. Using in situ X-ray diffraction, TEM, and thermogravimetric analysis, we have shown that the cesium dopants in the Cs2CO3-doped MgO nanoparticle system do not simply act as a promoter in sorption of CO2, but rather as a reagent alongside MgO. A new mixed magnesium-cesium carbonate phase has been found to be responsible for the improved sorption capacity of the doped-MgO-based sorbents. On the basis of our findings, it is suggested that a higher sorption capacity may be achieved if cesium is uniformly dispersed throughout the MgO particles.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 17514-17520 |
| Number of pages | 7 |
| Journal | Journal of Physical Chemistry C |
| Volume | 117 |
| Issue number | 34 |
| DOIs | |
| State | Published - Aug 29 2013 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Energy(all)
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
Cite this
Nanoscale structural investigation of Cs2CO3-doped MgO sorbent for CO2 capture at moderate temperature. / Liu, Maoyuan; Vogt, Christian; Chaffee, Alan L.; Chang, Lan-Yun.
In: Journal of Physical Chemistry C, Vol. 117, No. 34, 29.08.2013, p. 17514-17520.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Nanoscale structural investigation of Cs2CO3-doped MgO sorbent for CO2 capture at moderate temperature
AU - Liu, Maoyuan
AU - Vogt, Christian
AU - Chaffee, Alan L.
AU - Chang, Lan-Yun
PY - 2013/8/29
Y1 - 2013/8/29
N2 - MgO sorbents doped with alkali-metal carbonates have been shown to exhibit improved sorption capacities at both low and moderate operating temperatures, compared to pure MgO sorbents. However, the mechanism of how alkali-metal carbonates enhance the CO2 sorption is not well understood. Using in situ X-ray diffraction, TEM, and thermogravimetric analysis, we have shown that the cesium dopants in the Cs2CO3-doped MgO nanoparticle system do not simply act as a promoter in sorption of CO2, but rather as a reagent alongside MgO. A new mixed magnesium-cesium carbonate phase has been found to be responsible for the improved sorption capacity of the doped-MgO-based sorbents. On the basis of our findings, it is suggested that a higher sorption capacity may be achieved if cesium is uniformly dispersed throughout the MgO particles.
AB - MgO sorbents doped with alkali-metal carbonates have been shown to exhibit improved sorption capacities at both low and moderate operating temperatures, compared to pure MgO sorbents. However, the mechanism of how alkali-metal carbonates enhance the CO2 sorption is not well understood. Using in situ X-ray diffraction, TEM, and thermogravimetric analysis, we have shown that the cesium dopants in the Cs2CO3-doped MgO nanoparticle system do not simply act as a promoter in sorption of CO2, but rather as a reagent alongside MgO. A new mixed magnesium-cesium carbonate phase has been found to be responsible for the improved sorption capacity of the doped-MgO-based sorbents. On the basis of our findings, it is suggested that a higher sorption capacity may be achieved if cesium is uniformly dispersed throughout the MgO particles.
UR - http://www.scopus.com/inward/record.url?scp=84883416471&partnerID=8YFLogxK
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U2 - 10.1021/jp4024316
DO - 10.1021/jp4024316
M3 - Article
VL - 117
SP - 17514
EP - 17520
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 34
ER -