In addition to larger CO2 emission sources, CO2 capture from dispersed sources including transportation vehicles is an option to reduce CO2 emissions. In the past years, we have developed a novel sorbent concept, named as molecular basket sorbent (MBS) which shows some potential advantages including higher sorption capacity, high selectivity, easy regeneration and positive effect of moisture. In this paper, we report the application of MBS for CO2 removal from gas streams with low CO2 concentrations at ambient conditions. The study has shown that the nano-composite molecular basket sorbent, 50 wt% PEI/SBA-15 could effectively capture CO2 from a gas stream containing 1 vol% CO2 at ambient conditions and atmospheric pressure. A sorption breakthrough capacity and saturation capacity of 63.1 and 66.7 mg/g, respectively and a separation selectivity of ca. 14 for CO2/CO and ca. 185 for CO2/Ar was achieved at 75 °C. The study on CO2-TPD using a simulated air containing 400 ppm CO2 in N2 clearly showed that the sorbent can effectively capture CO2 directly from air at room temperature with a sorption capacity of ca. 22.5 mg/g. The current work indicates that the molecular basket sorbent is promising for practical applications including air-decarbonization and other-related industrial applications in CO2 removal.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)