CO 2 capture and storage has attracted great interests in both fundamental research and practical application. Solid amine sorbent has been considered as one of the potential sorbents for CO 2 capture, which is typically prepared by immobilization of CO 2-philic polyethylenimine (PEI) or oligomer on a mesoporous material such as MCM-41, SBA-15, MCM-48, KIT-6 etc. In this paper, we report our current progress in improvement of the sorption performance of the molecular basket sorbent (MBS) by using 3-D hexagonal mesoporous silica material (HMS) with wormhole like structure for CO 2 capture from flue gas. The result showed that HMS-MBS with 50 wt% PEI loading achieved a CO 2 sorption capacity of 150 mg-CO 2/g-sorb, which is higher than those of MBS prepared by MCM-41 (90 mg-CO 2/g-sorb) and SBA-15 (140 mg-CO 2/g-sorb) with the same PEI loading, although the pore size and pore volume of HMS is quite similar to MCM-41. In addition, the highest CO 2 sorption capacity of 180 mg-CO 2/g-sorb was obtained by loading 65% PEI over HMS. The superior CO 2 sorption capacity of HMS-MBS could be attributed to the special pore structure of HMS, i.e., 3-D wormhole channel motif structure and large textural mesoporosity.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)