Non-Porous versus Mesoporous Siliceous Materials for CO₂ Capture.

ABSTRACT: In this study, the adsorption properties of a Stöber silica-based material towards CO₂ were evaluated for the first time. The use of Stöber silica as support is interesting for real technological applications mainly due to economic factors. Furthermore, a direct comparison between the non porous Stöber sample with an ordered porous material (based on MCM-41 silica) allowed to evaluate the effect of the porosity on the CO₂ adsorption properties. In order to make silica materials reactive towards CO₂, they were functionalized by introducing amino groups via grafting of 3-[2-(2-aminoethyl)aminoethyl]aminopropyltrimethoxysilane. After a qualitative study of the CO₂ adsorption, the quantitative determination of CO₂ adsorption capacity at 35?°C revealed that the mesoporous material is more efficient compared to the Stöber-based one (adsorption capacity values of 0.49 and 0.58?mol/kg for Stöber-based and mesoporous samples). However, since the difference in the adsorption capacity is only about 15?% and the Stöber-based sample is considerably cheaper, the non-porous sample should be considered as a favourable adsorbent material for CO₂ capture applications.

SUBMITTER: Vittoni C 

PROVIDER: S-EPMC6587325 | biostudies-literature | 2019 Jun

REPOSITORIES: biostudies-literature