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

Maoyuan Liu, Christian Vogt, Alan L. Chaffee, Shery L.Y. Chang

Research output: Contribution to journalArticle

39 Scopus citations

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

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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