Preparation of CO 2 adsorbent with N 1 -(3-(trimethoxysilyl)propyl)-1,3-propanediamine and its performance
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pISSN: 0256-1115 eISSN: 1975-7220
INVITED REVIEW PAPER
INVITED REVIEW PAPER
Preparation of CO2 adsorbent with N1-(3-(trimethoxysilyl)propyl)-1,3propanediamine and its performance Tristan James Sim, Rose Mardie Pacia, and Young Soo Ko† Department of Chemical Engineering, Kongju National University, 1223-24 Cheonan-daero, Seobuk-gu, Cheonan 31080, Korea (Received 9 February 2020 • Revised 9 April 2020 • Accepted 30 April 2020) AbstractN1-(3-(trimethoxysilyl)propyl)-1,3-propanediamine (2NS-P), a diaminosilane having a propyl spacer between the two amino groups was successfully synthesized, and a CO2 adsorbent functionalized with 2NS-P was prepared via impregnation of it into silica. The adsorption performance and stability of 2NS-P/Kona95 were examined and compared to that of N1-(3-(trimethoxysilyl)propyl)ethane-1,2-diamine (2NS)/Kona95 having an ethyl spacer. 2NS-P/Kona95 exhibited better CO2 adsorption capacity and CO2/N efficiency. The adsorbents were subjected to ten cycles of temperature swing adsorption (TSA), demonstrating that stability of 2NS-P/Kona95 was better than that of 2NS/Kona95. The spent 2NS-P/Kona95 showed the absence of cyclic urea formation in FT-IR spectrum, explaining the better stability of 2NS-P/Kona95 than 2NS/Kona95. Keywords: CO2 Adsorption, Amine Structure, Adsorbent, Temperature Swing Adsorption
(2NS). Diamines were expected to demonstrate a higher capacity due to their higher nitrogen content than monoamines. The present challenge, however, in employing these kinds of diamine-functionalized adsorbents is that they tend to form irreversible degradation species which lowers their adsorption capacity. At high temperature, primary amines react with CO2 to form cyclic urea as with monoamines, while secondary amines react with O2 to form amides [14,17-19]. Research endeavors on diamines and polyamines with an ethyl spacer (N atoms separated by 2 carbons) have dominated CO2 capture technology in recent years [20-22]. However, little attention has been devoted in elucidating the characteristics and performance of diamines with a propyl spacer [23,24]. In this study, we first synthesized N1-(3-(trimethoxysilyl)propyl)1,3-propanediamine (2NS-P), a diaminosilane having a propyl spacer between its two amine groups, and subsequently immobilized it onto silica to prepare the functionalized CO2 adsorbent. Characterization of 2NS-P was via 1H-NMR. Physical properties of the CO2 adsorbent were further examined and compared with that of an adsorbent containing 2NS. We also investigated and compared the cyclic stabilities of the prepared adsorbents by thermal gravimetric analysis and TSA simulation to assess CO2 adsorption stability.
INTRODUCTION Carbon dioxide (CO2) emission has been the primary source of increasing greenhouse gas concentration in the atmosphere. The most consistently researched and applied technology of CO2 capture is post-combustion capture (PCC) [1-3]. CO2 absorption with aqueous amine solutions has become a promising technology [4], but this process is flawed with several proble
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