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
Hauptverfasser: Li, Cheng, Wang, Xiaoqing, Yang, Anjie, Chen, Peng, Zhao, Tianxiang, Liu, Fei
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.
ISSN:2470-1343
2470-1343
DOI:10.1021/acsomega.1c04743