CO2 Capture With Absorbents of Tertiary Amine Functionalized Nano–SiO2

Abstract

To improve CO 2 adsorption performance of nanoparticle absorbents, a novel tertiary amine functionalized nano-SiO 2 (NS-NR 2 ) was synthesized based on the 3-aminopropyltrimethoxysilane (KH540) modified nano-SiO 2 (NS-NH 2 ) via methylation. The chemical structure and performances of the NS-NR 2 were characterized through a series of experiments, which revealed that NS-NR 2 can react with CO 2 in water and nanofluid with low viscosity revealed better CO 2 capture. The CO 2 capture mechanism of NS-NR 2 was studied by kinetic models. From the correlation coefficient, the pseudo second order model was found to fit well with the experiment data. The influencing factors were investigated, including temperature, dispersants, and cycling numbers. Results has shown the additional surfactant to greatly promote the CO 2 adsorption performance of NS-NR 2 because of the better dispersity of nanoparticles. This work proved that NS-NR 2 yields low viscosity, high capacity for CO 2 capture, and good regenerability in water. NS-NR 2 with high CO 2 capture will play a role in storing CO 2 to enhanced oil recovery in CO 2 flooding.

Hybrid Materials Based on Silica Matrices Impregnated with Pt-Porphyrin or PtNPs Destined for CO2 Gas Detection or for Wastewaters Color Removal

“…Based on these results, we can presume that the process is not based only on physical adsorption but is accompanied by other physical-chemical interactions, depending on the dispersibility of the porphyrin into the silica matrices. In addition, due to the fact that no linear dependence was obtained to pass through the origin point (Figure 11), this is a proof for an intraparticle diffusion mechanism, and it is clear that intraparticle diffusion is not the sole factor controlling CO 2 adsorption rate [49]. The temperature of 20 • C was chosen to favor CO 2 adsorption, which is an exothermic reaction.…”

Palladium-Catalyzed Regioselective Arylation of Unprotected Allylamines

“…Meanwhile, the amine product can also be partially stabilized by reaction with CO 2 . Notably, although the exact role of the added water is not known, it has been postulated to change both the kinetics and enthalpic favorability of carbamate formation and is clearly necessary for reproducibly higher yields (see Supporting Information for more details). − …”

Screening of the Role of the Chemical Structure in the Electrochemical Stability Window of Ionic Liquids: DFT Calculations Combined with Data Mining

“…Ionic liquids (ILs) are salts that generally have melting points under 100 °C. − They have a wide range of applications, such as solvents in the pharmaceutical industry, CO 2 capture, catalysis, cellulose dissolution, and in organic synthesis . ILs are also an interesting choice as electrolytes in batteries and supercapacitors − , due to their thermal stability, high ionic conductivity, and wide electrochemical stability window (ESW). − In addition, ILs are also task-specific solvents, which means that by small modifications in the chemical structures of the cations and anions, or by simply replacing one of them, it is possible to tune specific physicochemical properties, adding new functionalities to the ionic liquids. ,, This creates unique opportunities for the improvement of several properties in the IL-based systems.…”

“…Ionic liquids (ILs) are salts that generally have melting points under 100 °C. 1−3 They have a wide range of applications, such as solvents in the pharmaceutical industry, 4 CO 2 capture, 5 catalysis, 6 cellulose dissolution, 7 and in organic synthesis. 8 ILs are also an interesting choice as electrolytes in batteries and supercapacitors [1][2][3]9 due to their thermal stability, high ionic conductivity, and wide electrochemical stability window (ESW).…”