期刊
CHEMSUSCHEM
卷 12, 期 8, 页码 1712-1723出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201802978
关键词
amine; silica adsorbent; amino alcohols; CO2 adsorption; direct air capture; polyamines
资金
- Loker Hydrocarbon Research Institute, USC
CO2 adsorbents based on the reaction of pentaethylenehexamine (PEHA) or tetraethylenepentamine (TEPA) with propylene oxide (PO) were easily prepared in one pot by impregnation on a silica support in water. The starting materials were readily available and inexpensive, facilitating the production of the adsorbents on a large scale. The prepared polyamine/epoxide adsorbents were efficient in capturing CO2 and could be regenerated under mild conditions (50-85 degrees C). They displayed a much-improved stability compared with their unmodified amine counterparts, especially under oxidative conditions. Leaching of the active organic amine became minimal or nonexistent after treatment with the epoxide. The adsorption as well as desorption kinetics were also greatly improved. The polyamine/epoxide adsorbents were able to capture CO2 from various sources including ambient air and indoor air with CO2 concentrations of only 400-1000 ppm. The presence of water, far from being detrimental, increased the adsorption capacity. Their use for indoor air quality purposes was explored.
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