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Capture of CO₂ from flue gas via multiwalled carbon nanotubes

Su, Fengsheng, Lu, Chungsying, Cnen, Wenfa, Bai, Hsunling, Hwang, Jyh Feng
Science of the total environment 2009 v.407 no.8 pp. 3017-3023
adsorbents, adsorption, air, carbon, carbon dioxide, carbon nanotubes, physicochemical properties, silica, temperature, water content
Carbon nanotubes (CNTs) were modified by 3-aminopropyl-triethoxysilane (APTS) solution and were tested for its CO₂ adsorption potential at multiple temperatures (20-100 °C). The physicochemical properties of CNTs were changed after the modification, which makes CNTs adsorb more CO₂ gases. The adsorption capacities of CO₂ via CNTs and CNTs(APTS) decreased with temperature indicating the exothermic nature of adsorption process and increased with water content in air at 0-7%. The mechanism of CO₂ adsorption on CNTs and CNTs(APTS) appears mainly attributable to physical force regardless of temperature change, which makes regeneration of spent CNTs at a relatively low temperature become feasible. The CNTs(APTS) have good adsorption performance of CO₂ at 20 °C as compared to many types of modified carbon or silica adsorbents documented in the literature. This suggests that the CNTs(APTS) are promising low-temperature adsorbents for CO₂ capture from flue gas.