Polyethyleneimine-Modified Amorphous Silica for the Selective Adsorption of CO 2 /N 2 at High Temperatures
Mechanochemistry is very attractive as an efficient, solvent-free, and simplified technique for the preparation of composite adsorbents. Here, a series of polyethyleneimine (PEI)-modified SiO adsorbents were prepared via mechanical ball milling for selective adsorption of CO at high temperatures. Th...
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Veröffentlicht in: | ACS omega 2021-12, Vol.6 (51), p.35389-35397 |
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Hauptverfasser: | , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Mechanochemistry is very attractive as an efficient, solvent-free, and simplified technique for the preparation of composite adsorbents. Here, a series of polyethyleneimine (PEI)-modified SiO
adsorbents were prepared via mechanical ball milling for selective adsorption of CO
at high temperatures. The structural properties of these adsorbents were characterized by XRD, SEM, TGA, FTIR, and N
adsorption-desorption. This method can better disperse the PEI evenly in the SiO
as well as maintain the porous structure of the adsorbents by comparing with the impregnated adsorbents. These adsorbents presented appreciable performance in separating CO
at high temperatures, and the CO
adsorption capacity of PEI(70%)/SiO
is up to 2.47 mmol/g at 70 °C and 1.5 bar, which is significantly higher than that of the same type of CO
adsorbent reported in the literature. Furthermore, the adsorbent of PEI(70%)/SiO
provided an ideally infinite selectivity for CO
/N
(15:85) at 70 °C. These results showed that mechanical grinding methods are a simple and effective approach to producing amine-modified silica composite adsorbents. |
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ISSN: | 2470-1343 2470-1343 |
DOI: | 10.1021/acsomega.1c04743 |