Hydrothermal synthesis of K2CO3-promoted hydrotalcite from hydroxide-form precursors for novel high-temperature CO2 sorbent

Hee Jin Jang, Chan Hyun Lee, Suji Kim, Sung Hyun Kim, Ki Bong Lee

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

In many materials for CO2 sorption, hydrotalcite is attracting substantial attention as a high temperature (200-500 °C) CO2 sorbent because of its fast sorption/desorption kinetics and easy regenerability. However, the CO2-sorption capacity of conventional hydrotalcite is relatively low for large-scale commercial use. To enhance CO2-sorption capacity, hydrotalcite is conventionally impregnated with alkali metals such as K2CO3. Although K 2CO3-impregnated hydrotalcite has high CO 2-sorption capacity, the preparation method takes long time and is inconvenient because hydrotalcite synthesis step and alkali metal impregnation step are separated. In this study, K2CO3-promoted hydrotalcite was newly synthesized from hydroxide-form percursors by a simple and eco-friendly method without a solvent-consuming washing step. Analysis based on X-ray diffraction indicated that the prepared samples had structures of well-defined hydrotalcite crystalline and un-reacted Mg(OH)2 precursor. Moreover, K2CO3 was successfully incorporated in hydrotalcite during the synthesis step. The prepared K2CO 3-promoted hydrotalcite showed high CO2-sorption capacity and had potential for use as a high-temperature CO2 sorbent.

Original languageEnglish
Pages (from-to)6914-6919
Number of pages6
JournalACS Applied Materials and Interfaces
Volume6
Issue number9
DOIs
Publication statusPublished - 2014 May 14

Keywords

  • high temperature
  • hydrothermal synthesis
  • hydroxide-form precursor
  • sorbent

ASJC Scopus subject areas

  • Materials Science(all)

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