Kinetics of carbon dioxide sorption on potassium-doped lithium zirconate

Rentian Xiong, Junichi Ida, Y. S. Lin

Research output: Contribution to journalArticle

202 Scopus citations

Abstract

Potassium-doped lithium zirconate (Li2ZrO3) sorbents with similar crystallite but different aggregate sizes were prepared by a solid-state reaction method from mixtures of Li2CO3, K2CO3, and ZrO2 of different particle sizes. Carbon dioxide sorption rate on the prepared Li2ZrO3 sorbents increases with decreasing sorbent aggregate size. It is the size of the aggregate, not the crystallite, of Li2 ZrO3 that controls the sorption rate. Temperature effect on CO2 sorption is complex, depending on both kinetic and thermodynamic factors. A mathematical model based on the double-shell sorption mechanism was established for CO2 sorption kinetics and it can fit experimental data quite well. Above 500°C, the rate-limiting step of CO2 sorption is the diffusion of oxygen ions through the ZrO2 shell formed during the carbonation reaction. Oxygen ion conductivities in the ZrO2 shell were obtained by regression of the experimental CO2 uptake curves with the model and are consistent with the literature data.

Original languageEnglish (US)
Pages (from-to)4377-4385
Number of pages9
JournalChemical Engineering Science
Volume58
Issue number19
DOIs
StatePublished - Oct 2003
Externally publishedYes

Keywords

  • Adsorption
  • Carbon dioxide
  • Kinetics
  • Lithium zirconate
  • Microstructure
  • Modeling

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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