Journal
APPLIED SURFACE SCIENCE
Volume 314, Issue -, Pages 314-321Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2014.06.164
Keywords
CO2 adsorption; Zeolite 13X; Amine
Categories
Funding
- CNPq [554049/2010-4]
- European Commission [295156]
- project of excellence of Junta de Andalucia [RNM 1565]
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The adsorption of CO2 on Zeolite 13X functionalized with amino groups was studied. Adsorbent functionalization was carried out by grafting with different loads of monoethanolamine (MEA). The adsorbents were characterized by N-2 adsorption/desorption isotherms at 77 K, x-ray diffraction, TGA, in situ FTIR, XPS and adsorption microcalorimetry. CO2 isotherms were studied in a gravimetric device up to 10 bar at 298 and 348 K. It was found that increasing loads of amine to the adsorbent tend to reduce micropore volume of the resulting adsorbents by pore blocking with MEA. There is experimental evidence that part of the loaded MEA is effectively covalently bonded to the zeolitic structure, whereas there is also physisorbed excess MEA which will eventually be desorbed by raising the temperature beyond MEA boiling point. Heats of adsorption at nearly zero coverage indicate that some of the adsorbed CO2 reacts with available amino groups, which agrees with the finding that the adsorption capacity increases with increasing temperature for the modified zeolite with the highest MEA load. (C) 2014 Elsevier B.V. All rights reserved.
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