Development of Amine-Modified Solid Sorbents for Postcombustion CO2 Capture

Amine-modified solid sorbents are potentially good candidates for postcombustion CO2 capture. We synthesized a series of amine-modified mesoporous silica sorbents, and measured their CO2 adsorption capacities. Among them, mesoporous silica MSU-H modified with (3-trimethoxysilylpropyl)diethylenetriamine, denoted by TA/MSU-H(II), showed high CO2 adsorption capacity of 3.08 mmol/g-sorbent at 60 °C with 15 kPa of CO2, 12 kPa of H2O vapor and 74 kPa of N2 as similar as the postcombustion CO2 capture condition. Furthermore, we confirmed that the CO2 adsorption capacity of TA/MSU-H(II) after 30 cycles of the adsorption at 60 °C and the desorption at 120 °C was 2.98 mmol/g-sorbent.