Abstract
Amine-functionalized silica sorbents were synthesized by blending (3-aminopropyl)trimethoxysilane (1NSP) and [3-(methylamino)propyl]trimethoxysilane (1NS-S) of varying proportions and incorporating it in the support via incipient wetness technique. Adsorption characteristics were examined at a design adsorption temperature of 30 oC. The blended amine adsorbents exhibited higher CO2 adsorption capacity (5.6-6.4 wt%) and CO2/N efficiency (0.47-0.48) than 1NS-P and 1NS-S. Among the blended amine adsorbents synthesized in this work, 1NS-PS-50, which has 50% primary amine and 50% secondary amine, is the most ideal for post-combustion CO2 capture application because it has high CO2 adsorption capacity, high CO2/N efficiency, and better performance than its diamine counterpart, N-[3-(trimethoxysilyl)propyl]ethylenediamine.
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