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Enhancement of CO2 Desorption from Reinforced 2‑(2-Aminoethylamine) Ethanol Aqueous Solution by Multi-walled Carbon Nanotubes
journal contribution
posted on 2019-06-17, 00:00 authored by Xiaojing Li, Yongchun Zhang, Shaoyun ChenCO2 desorption
in 2-(2-aminoethylamine) ethanol (AEE)
aqueous solution promoted by different types of multi-walled carbon
nanotubes (pristine MWCNT, MWCNT-OH, and MWCNT-COOH) was investigated
in a continuous absorption–desorption apparatus. The CO2 absorption (313 K) and desorption (393 K) processes with
each solid at concentrations of 0.01–0.07 wt % in 2 mol/L AEE
aqueous solution were investigated by comparing CO2 desorption
rate, desorption volume, and cyclic absorption capacity at ambient
pressure. It was found that each kind of MWCNT can significantly increase
the CO2 desorption rate comparing to the blank test. The
average desorption rates in 30 min of pristine MWCNT, MWCNT-OH, and
MWCNT-COOH were enhanced by 26.7% (0.05 wt %), 32.4% (0.05 wt %),
and 29.5% (0.07 wt %), respectively. The amount of CO2 desorbed
increased with the increasing addition amount of MWCNTs, and stable
absorption loading is improved up to 18%. The MWCNTs were characterized
by XRD, NH3-TPD, FT-IR, N2-BET, and SEM before
and after several absorption–desorption cycles. The characterization
results verified their stability and activity for AEE aqueous solution.
Adding MWCNT-OH into the AEE solution exhibits application feasibility
in the industrial CO2 capture process to increase the desorption
rate.
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MWCNT-COOHmulti-walled carbon nanotubesMWCNTTPDFT-IRcharacterization resultsN 2BETXRDdesorption rateEthanol Aqueous SolutionCO 2NH 3wtambient pressuredesorption volumeAEE solution exhibits application feasibilitySEMCO 2 desorbeddesorption ratesabsorption loadingCO 2 DesorptionMWCNT-OHaddition amount30 mincyclic absorption capacityCO 2 desorption rateMulti-walled Carbon Nanotubes CO 2 desorption
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