Influence of surfactant on CO₂ adsorption of amine-functionalized MCM-41

Concerning the increasing greenhouse effect, the development of efficient CO₂ adsorbents is very important. In this study, the influence of surfactant on the adsorption performance of amine-functionalized MCM-41 was analysed. The results showed that the residual amount of surfactant in MCM-41 was gradually decreased with the increase of calcination temperature which improved the pore structure. The maximum adsorption capacity (5.495 mmol/g) appeared at PEI-MCM-41-100°C indicated that the adsorption capacity could be improved under the function of surfactant. By calculating the diffusion coefficient of CO₂ adsorption process in PEI-MCM-41-100/200/300/400/550°C, the diffusion resistance of CO₂ was the lowest in PEI-MCM-41-100°C, which directly proved that the synergism of surfactant and organic amine could reduce the diffusion resistance of CO₂ in the pore.