Use of small-amplitude oscillatory shear rheometry to study the flow properties of pure and potassium-doped Li2ZrO3 sorbents during the sorption of CO2 at high temperatures

Mara Olivares-Marin, Miguel Castro-Diaz, Trevor C. Drage, M Mercedes Maroto-Valer

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

It has been previously recognized that the addition of lithium/potassium carbonates salts to pure Li2ZrO3 improves significantly the diffusion of CO2 uptake and, consequently, the CO2 sorption capacity. This effect has been associated with the formation of a eutectic molten carbonate layer on the outer surface of the reactant Li2ZrO3 particles. The present work proposes for the first time the use of small-amplitude oscillatory shear (SAOS) rheometry to determine the rheological properties of pure Li2ZrO3 and K-doped Li2ZrO3 under CO2 atmosphere and understand the interplay between these properties and the CO2 absorbed. The results have shown that the theological parameters (storage modulus, G'; loss modulus, G '': and phase angle, delta) of the samples depend on the type of carbonate mixture and the extent of diffusion and sorption of CO2. (C) 2010 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)415-420
Number of pages6
JournalSeparation and Purification Technology
Volume73
Issue number3
DOIs
Publication statusPublished - 8 Jul 2010

Keywords

  • SAOS rheometry
  • TGA
  • COAL
  • CAPTURE
  • RHEOLOGICAL BEHAVIOR
  • LITHIUM ZIRCONATE
  • CO2 capture
  • MECHANISM
  • VISCOELASTIC PROPERTIES
  • Lithium zirconate
  • CARBON-DIOXIDE

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