Synthesis of nano-sized spherical Mg3Al-CO3 layered double hydroxide as a high-temperature CO2 adsorbent

Qiang Wang*, Yanshan Gao, Jizhong Luo, Ziyi Zhong, Armando Borgna, Zhanhu Guo, Dermot O'Hare

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

97 Scopus citations

Abstract

Due to its layered structure, layered double hydroxides (LDHs) generally prefer to form either "sand rose" or platelet-like morphologies. To the best of our knowledge, nano-sized spherical LDHs have not been previously reported. In this work, we present the first successful synthesis of nano-sized spherical Mg3Al-CO3 LDH using a facile isoelectric point (IEP) method. SEM and TEM analyses confirmed that the size of the nanospheres is very uniform, with an average value of ca. 20 nm. Furthermore, a mesoporous LDH sample composed of the above synthesized uniform nano-spheres can be prepared, and this material showed a H1 type hysteresis loop in the N2 BET analysis. Such mesoporous LDH possesses large mesopores (18 nm) and a high surface area (103 m2 g-1), which we believe make it a promising adsorbent, catalyst, or support material. We demonstrated that its CO2 capture capacity is 0.83 mmol g-1 at 200 °C and 1 atm and it can be further increased up to 1.21 mmol g-1 by doping with 20 wt% K2CO3.

Original languageEnglish
Pages (from-to)3414-3420
Number of pages7
JournalRSC Advances
Volume3
Issue number10
DOIs
StatePublished - 14 Mar 2013
Externally publishedYes

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