Hydrothermal Synthesis of K2CO3-Promoted Hydrotalcite from Hydroxide-Form Precursors for Novel High-Temperature CO2 Sorbent
- Authors
- Jang, Hee Jin; Lee, Chan Hyun; Kim, Suji; Kim, Sung Hyun; Lee, Ki Bong
- Issue Date
- 14-5월-2014
- Publisher
- AMER CHEMICAL SOC
- Keywords
- sorbent; K2CO3-promoted hydrotalcite; CO2 sorption; hydroxide-form precursor; hydrothermal synthesis; high temperature
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.6, no.9, pp.6914 - 6919
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 6
- Number
- 9
- Start Page
- 6914
- End Page
- 6919
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/98516
- DOI
- 10.1021/am500720f
- ISSN
- 1944-8244
- Abstract
- In many materials for CO2 sorption, hydrotalcite is attracting substantial attention as a high temperature (200-500 degrees 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 K2CO3-impregnated hydrotalcite has high CO2-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 K2CO3-promoted hydrotalcite showed high CO2-sorption capacity and had potential for use as a high-temperature CO2 sorbent.
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