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Effect of various aminosilanes functionalized inside nanoporous silica on CO2 adsorption performance

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Abstract

Three different aminosilanes ((3-aminopropyl)trimethoxysilane (1NS), N-[3-(trimethoxysilyl) propyl]ethylenediamine (2NS), N1-(3-trimethoxysilylpropyl)diethylenetriamine (3NS)) were grafted covalently inside nanoporous silica (NPS-1) with a large surface area to prepare CO2 adsorbents. The prepared CO2 sorbents were evaluated for their CO2 sorption capacity, kinetic behavior, temperature programmed desorption (TPD) and textural properties. Grafting efficiency of 1NS was better due to the smaller molecular size compared to 2NS and 3NS, which are difficult to react with the hydroxyl group of the silica surface due to steric hindrance. The highest adsorption capacity of 7.0 wt% was observed for the 2NS/NPS-1 adsorbent, followed by 5.2 wt% for 1NS/NPS-1, then 5.0 wt% for 3NS/NPS-1. The adsorption capacity of 2NS/NPS-1 was highest at 30 °C, and it gradually decreased as the adsorption temperature increased. TPD analysis showed that the reaction of primary amine of 2NS with CO2 inside the nanoporous silica could form less thermally stable carbamic acid and carbamate compared to 1NS and 3NS.

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Acknowledgements

This work was supported by a Korea CCS R&D Center (KCRC) grant funded by the Korea government (Ministry of Science, ICT, and Future Planning) (No. 2014049259).

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  1. Department of Chemical Engineering, Kongju National University, 275 Budae-dong, Cheonan, Chungnam, 31080, Korea

    Dong Hyun Kim & Young Soo Ko

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  1. Dong Hyun Kim
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  2. Young Soo Ko
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Correspondence to Young Soo Ko.

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Kim, D.H., Ko, Y.S. Effect of various aminosilanes functionalized inside nanoporous silica on CO2 adsorption performance. Res Chem Intermed 44, 3661–3672 (2018). https://doi.org/10.1007/s11164-018-3373-5

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  • DOI: https://doi.org/10.1007/s11164-018-3373-5

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