High-temperature CO<inf>2</inf> sorption on Na<inf>2</inf>CO<inf>3</inf>-impregnated layered double hydroxides

Yoon Jae Min, Seok Min Hong, Sung Hyun Kim, Ki Bong Lee, Sang Goo Jeon

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Layered double hydroxide (LDH), one of representative high-temperature CO<inf>2</inf> sorbents, has many advantages, including stable CO<inf>2</inf> sorption, fast sorption kinetics, and low regeneration temperature. However, CO<inf>2</inf> sorption uptake on LDH is not high enough for practical use; thus it is usually enhanced by impregnation with alkali metals such as K<inf>2</inf>CO<inf>3</inf>. In this study, LDH was impregnated with Na<inf>2</inf>CO<inf>3</inf>, and analyses based on scanning electron microscopy, N<inf>2</inf> gas physisorption, in situ X-ray diffraction, and Fourier transform infrared spectroscopy were carried out to elucidate the characteristics of sorbents and the mechanism of CO<inf>2</inf> sorption. Although the surface area of LDH decreased after Na<inf>2</inf>CO<inf>3</inf> impregnation, CO<inf>2</inf> sorption uptake was greatly enhanced by the additional basicity of Na<inf>2</inf>CO<inf>3</inf>. The crystal structure of Na<inf>2</inf>CO<inf>3</inf> in the Na<inf>2</inf>CO<inf>3</inf>-impregnated LDH changed from monoclinic to hexagonal with increasing temperature, and the sorbed-CO<inf>2</inf> was stored in the form of carbonate. Thermogravimetric analysis was used to measure CO<inf>2</inf> sorption uptake at 200–600 °C. The sample of Na<inf>2</inf>CO<inf>3</inf>: LDH=0.35: 1 weight ratio had the largest CO<inf>2</inf> sorption uptake among the tested sorbents, and the CO<inf>2</inf> sorption uptake tended to increase even after 400 °C.

Original languageEnglish
Pages (from-to)1668-1673
Number of pages6
JournalKorean Journal of Chemical Engineering
Volume31
Issue number9
DOIs
Publication statusPublished - 2014

Keywords

  • CO<inf>2</inf> Sorption
  • High Temperature
  • Layered Double Hydroxide
  • Na<inf>2</inf>CO<inf>3</inf>

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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