Polyethyleneimine-Modified Amorphous Silica for the Selective Adsorption of CO₂/N₂ at High Temperatures.

ABSTRACT: 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 SiO₂ adsorbents were prepared via mechanical ball milling for selective adsorption of CO₂ at high temperatures. The structural properties of these adsorbents were characterized by XRD, SEM, TGA, FTIR, and N₂ adsorption-desorption. This method can better disperse the PEI evenly in the SiO₂ as well as maintain the porous structure of the adsorbents by comparing with the impregnated adsorbents. These adsorbents presented appreciable performance in separating CO₂ at high temperatures, and the CO₂ adsorption capacity of PEI(70%)/SiO₂

SUBMITTER: Li C 

PROVIDER: S-EPMC8717403 | biostudies-literature | 2021 Dec

REPOSITORIES: biostudies-literature