Alkyl-functionalization of (3-Aminopropyl)triethoxysilane-grafted zeolite beta for carbon dioxide capture in temperature swing adsorption

Lei Liu, Seongmin Jin, Kwangjun Ko, Hyejoo Kim, Ik Sung Ahn, Chang Ha Lee

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26 Citations (Scopus)


Amine-based solid sorbents are promising candidates for post-combustion CO2 capture owing to their high sorption capacity at operating temperatures. Sorbents are required for stable CO2 mixture sorption and regeneration. Herein, we report a novel alkyl-functionalization method for the stoichiometric conversion of primary amines to secondary amines in solid sorbents. (3-Aminopropyl)triethoxysilane (APTES) and alkyl-functionalized-APTES were grafted on zeolite beta through a reflux reaction; the alkyl-functionalization was confirmed by nuclear magnetic resonance and Fourier transform infrared analyses. Alkyl-functionalized-APTES zeolite exhibited a sorption capacity of 1.44 mmol/g (15% CO2 balanced with N2 at 90 °C), very high sorption rate of t1/2 = 0.69 min (over 90% of the total sorption capacity within 5 min), and long-term stability after 20 cycles in a temperature swing adsorption (TSA) operation (above 0.9 mmol/g at pure CO2 regeneration). Alkyl-functionalized-APTES zeolite beta showed higher sorption capacity and stability than APTES zeolite and PEI silica in TSA operation at CO2 mixture sorption and CO2 flow regeneration.

Original languageEnglish
Article number122834
JournalChemical Engineering Journal
Publication statusPublished - 2020 Feb 15

Bibliographical note

Publisher Copyright:
© 2019 Elsevier B.V.

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Environmental Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering


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