Abstract
In this work, SBA-15-(DBU-X) was prepared by dipping 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) into the mesoporous channels of SBA-15 in an attempt to improve the CO2 adsorption. The synthesized SBA-15-(DBU-X) was characterized with scanning electron microscopy, thermogravimetric analysis, Brunauer–Emmett–Teller adsorption analysis, and other methods. Then the CO2 adsorption/desorption properties were investigated using a self-designed fixed-bed adsorption system. The results indicated that DBU could be loaded on the SBA-15 mesoporous molecular sieves effectively and that SBA-15-(DBU-X) had good adsorption capacity toward CO2. SBA-15-(DBU-X) had good thermal stability at temperatures below 140 °C. At room temperature, with increasing loading of DBU and total flow rate of simulated flue gas, the adsorption of CO2 on SBA-15-(DBU-X) had an increasing trend followed by a decrease. When the volume fraction ratio of CO2 and H2O was 1:1 in the simulated flue gas, SBA-15-(DBU-X) had an optimum capacity of CO2 adso...
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