The influence of mechanical treatment on the absorption of CO2 by perovskite oxides

K. Nomura, K. Tokumistu, T. Hayakawa, Z. Homonnay

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Abstract

Perovskite oxides of composition (Sr(1-x)Ca(x))(Fe0.5Co0.5)O(3-δ) were investigated for CO2 absorption properties and were proved to be useful as materials for CO2 absorption in the temperature range from 550 to 850 °C. The absorption rate of CO2 increased with Ca doping. The mechanical treatment of perovskite oxides for several minutes, especially for the oxides containing a small amount of Ca, was found to be effective for activating the oxides for CO2 absorption and for reducing the starting temperature of CO2 absorption by about 80 °C. However, it was not less effective to treat the oxides for a long time. The site distortion due to Sr and Ca ions at site A and the mixed valence states at site B were confirmed to be effective for CO2 absorption at high temperatures. During the absorption of CO2, a spinel compound was formed according to the following reaction: 2(Sr,Ca)(Fe,Co)O2.5 + CO2 → (Sr,Ca)CO3 + (Sr,Ca)(Fe,Co)2O4.

Original languageEnglish
Pages (from-to)69-77
Number of pages9
JournalJournal of Radioanalytical and Nuclear Chemistry
Volume246
Issue number1
DOIs
Publication statusPublished - Oct 30 2000

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ASJC Scopus subject areas

  • Analytical Chemistry
  • Nuclear Energy and Engineering
  • Radiology Nuclear Medicine and imaging
  • Pollution
  • Spectroscopy
  • Public Health, Environmental and Occupational Health
  • Health, Toxicology and Mutagenesis

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