Triethanolamine-modified layered double oxide for efficient CO2 capture with low regeneration energy

Feifan Zhao; Bicheng Zhu; Linxi Wang; Jiaguo Yu

doi:10.1016/j.jcis.2023.12.173

Triethanolamine-modified layered double oxide for efficient CO₂ capture with low regeneration energy

J Colloid Interface Sci. 2024 Apr:659:486-494. doi: 10.1016/j.jcis.2023.12.173. Epub 2023 Dec 30.

Authors

Feifan Zhao¹, Bicheng Zhu¹, Linxi Wang², Jiaguo Yu³

Affiliations

¹ Laboratory of Solar Fuel, Faculty of Materials Science and Chemistry, 68 Jincheng Street, China University of Geosciences, Wuhan 430078, PR China.
² Laboratory of Solar Fuel, Faculty of Materials Science and Chemistry, 68 Jincheng Street, China University of Geosciences, Wuhan 430078, PR China. Electronic address: wanglinxi@cug.edu.cn.
³ Laboratory of Solar Fuel, Faculty of Materials Science and Chemistry, 68 Jincheng Street, China University of Geosciences, Wuhan 430078, PR China. Electronic address: yujiaguo93@cug.edu.cn.

PMID: 38184991
DOI: 10.1016/j.jcis.2023.12.173

Abstract

Various adsorbents for CO₂ capture have been developed to mitigate the greenhouse effect. In this work, a novel CO₂ adsorbent was fabricated by depositing triethanolamine (TEOA) onto the surface of nickel-cobalt-aluminum layered double oxide (NiCoAl-LDO) via the impregnation method. The CO₂ capacity of the TEOA-LDO composite reached 1.27 mmol/g at 0 °C and 100 kPa, which was twice that of unmodified NiCoAl-LDO. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) showed that the hydroxyl groups (-OH) on the surface of NiCoAl-LDO played a significant role in facilitating CO₂ adsorption, similar to CO₂ adsorption in the presence of H₂O, where CO₂ is not converted to carbamates but to bicarbonates through base-catalyzed hydration. This bicarbonate pathway doubles the theoretical amine efficiency, increases the CO₂ capacity, and reduces the energy consumption during CO₂ desorption. The work provides valuable insights into the development of CO₂ adsorbents with high capacity, excellent cycling stability, and low regeneration energy.

Keywords: CO(2) capture; Hydroxyl; Layered double oxide; Triethanolamine.