Quasi-static CO2 adsorption study using PEI-SCF

https://doi.org/10.1039/C8TA06224B

“To examine the variation of CO₂ uptake with temperature and hence to identify the optimal adsorption temperature, quasi-static CO₂ adsorption tests were first conducted for PEI-modified SCF adsorbents at temperatures between ambient temperature and 120 °C with a heating of 0.5 °C min⁻¹. The use of such a low heating rate is to facilitate near equilibrium CO₂ adsorption at individual adsorption temperatures in the range. Fig. 4 shows the results from the quasi-static tests for selected samples. As can be seen from Fig. 4, the CO₂ uptake first increased and then decreased with adsorption temperature for all the samples examined, and the differences between the CO₂ uptakes were significantly larger at lower adsorption temperatures. Meanwhile, the optimal adsorption temperature giving rise to the highest CO₂ uptake also varied considerably for different samples, despite their same level of PEI loading at 60 wt%. The sample SCF-3-120-24 was found to have the lowest optimal adsorption temperature of ca. 71 °C, compared to 75 °C for SCF-1-100-24 and SCF-2-100-24 and the highest optimal of 80 °C observed for the sample SCF-0-100-24, respectively.”

“Fig. 4 Quasi-static CO₂ adsorption tests of selected PEI (60%)-modified SCF adsorbents in simulated flue gas (15% CO₂ in N₂). Conditions: heating rate of 0.5 °C min⁻¹ from ambient temperature to 120 °C; content of PEI-600: 60 wt%.”