Various adsorbents for CO capture have been developed to mitigate the greenhouse effect. In this work, a novel CO adsorbent was fabricated by depositing triethanolamine (TEOA) onto the surface of nickel-cobalt-aluminum layered double oxide (NiCoAl-LDO) via the impregnation method. The CO 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 CO adsorption, similar to CO adsorption in the presence of HO, where CO is not converted to carbamates but to bicarbonates through base-catalyzed hydration. This bicarbonate pathway doubles the theoretical amine efficiency, increases the CO capacity, and reduces the energy consumption during CO desorption. The work provides valuable insights into the development of CO adsorbents with high capacity, excellent cycling stability, and low regeneration energy.
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| http://dx.doi.org/10.1016/j.jcis.2023.12.173 | DOI Listing |
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