YBaCo 4O 7+δ sorbent for oxygen-enriched carbon dioxide stream production at a low-temperature

Zebao Rui, Jingjing Ding, Lining Fang, Y. S. Lin, Yongdan Li

Research output: Contribution to journalArticle

22 Scopus citations

Abstract

Oxyfuel combustion, using O 2/CO 2 mixed gas as the oxidant, increases CO 2 concentration in the flue gas and reduces the cost of CO 2 capture. Nevertheless, the cost of oxygen production is a key to make the process a viable future option. In this work, YBaCo 4O 7+δ (YBC114) sorbent with a layered hexagonal structure was prepared and used to produce the O 2-CO 2 gas mixture at a low temperature (200-400°C). YBC114 has both the ability of temperature swinging oxygen absorption/desorption (TSA) and the property of pressure swinging oxygen absorption/desorption (PSA) in the temperature range of 200-400°C. The XRD patterns show that YBC114 has a good stability in both the O 2-containing and CO 2-containing atmosphere at 200-400°C. Cyclic operation for the low temperature O 2-enriched CO 2 stream production indicates that YBC114 has high cyclic stability. The absorption/desorption kinetics can be improved by combining PSA with TSA at no cost of the O 2 absorption capacity. For such a design, oxygen is absorbed when YBC114 is heated from 200°C to 345°C with a slow ramping rate in an air stream. Oxygen is desorbed and an oxygen-enriched carbon dioxide stream is obtained when YBC114 is exposed in a carbon dioxide stream and cooled from 345°C to 200°C. It has been found that the synthesis method of the YBC114 also has a significant effect on the oxygen absorption/desorption kinetics.

Original languageEnglish (US)
Pages (from-to)191-196
Number of pages6
JournalFuel
Volume94
DOIs
StatePublished - Apr 1 2012

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Keywords

  • Carbon dioxide sequestration
  • Oxyfuel combustion
  • Oxygen sorbent
  • YBaCo O

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Organic Chemistry

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