Optimal CO2 Sorption in Functionalized Mesoporous Silica

January 9, 2020
Optimal CO2 Sorption in Functionalized Mesoporous Silica
(Left) structure of SBA-15/PEI-50, mesoporous silica (grey) highly loaded with surface (blue) and volume (purple) PEI. (Right) Volume PEI exhibits voids (light dots) that expand above 75 °C. CO2 molecules (black C, red O) physisorb on mesopore surface and

Scientific Achievement

It was shown that the amount of CO2 captured in mesoporous silica (SBA-15)  functionalized with polyethylenimine (PEI) is maximized at a temperature dependent on the amount of PEI; for SBA-15/PEI-50 the optimal temperature is 75 °C.​

Significance and Impact

A better understanding of the mechanism of CO2 sorption in PEI functionalized mesoporous silica has been obtained, showing how to more efficiently apply these materials for carbon capture.

Research Details

  • PEI loaded SBA-15 was characterized by standard methods as well as small angle neutron scattering (SANS).​
  • SANS was used to measure CO2 capture in-situ yielding the meso-structure  and CO2 distribution as a function of temperature.​

R. Zhang, X. Wang, S. Liu, et al., ACS Applied Materials & Interfaces, 11, 36515-36524 (2019)