Nanoscale structural investigation of Cs2CO3-doped MgO sorbent for CO2 capture at moderate temperature

Maoyuan Liu, Christian Vogt, Alan L. Chaffee, Lan-Yun Chang

Research output: Contribution to journalArticle

29 Citations (Scopus)

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 languageEnglish (US)
Pages (from-to)17514-17520
Number of pages7
JournalJournal of Physical Chemistry C
Volume117
Issue number34
DOIs
StatePublished - Aug 29 2013
Externally publishedYes

Fingerprint

sorbents
Sorbents
sorption
Sorption
Cesium
cesium
Alkali Metals
Carbonates
carbonates
Alkali metals
alkali metals
Temperature
temperature
operating temperature
Magnesium
reagents
Thermogravimetric analysis
magnesium
Doping (additives)
Nanoparticles

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 journalArticle

Liu, Maoyuan ; Vogt, Christian ; Chaffee, Alan L. ; Chang, Lan-Yun. / Nanoscale structural investigation of Cs2CO3-doped MgO sorbent for CO2 capture at moderate temperature. In: Journal of Physical Chemistry C. 2013 ; Vol. 117, No. 34. pp. 17514-17520.
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