Comparative study of CO2 capture by carbon nanotubes, activated carbons, and zeolites

Chungsying Lu*, Hsun-Ling Bai, Bilen Wu, Fengsheng Su, Jyh Feng Hwang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

270 Scopus citations

Abstract

Carbon nanotubes (CNTs), granular activated carbon (GAC), and zeolites were modified by 3-aminopropyl-triethoxysilane (APTS) and were selected as adsorbents to study their physicochemical properties and adsorption behaviors Of CO2 from gas streams. The surface nature of these adsorbents was changed after the modification, which make them adsorb more CO2 gases. Under the same conditions, the modified CNTs possess the greatest adsorption capacity Of CO2, followed by the modified zeolites and then the modified GAC. The mechanism of CO2 adsorption on these adsorbents appears mainly attributable to physical force, which makes regeneration of spent adsorbents at a relatively low temperature become feasible. The APTS-modified CNTs show good performance Of CO2 adsorption as compared to many types of modified carbon and silica adsorbents reported in the literature. This suggests that the APTS-modified CNTs are efficient CO2 adsorbents and that they possess potential applications for CO2 capture from gas streams.

Original languageEnglish
Pages (from-to)3050-3056
Number of pages7
JournalEnergy and Fuels
Volume22
Issue number5
DOIs
StatePublished - 1 Sep 2008

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