Abstract
A novel nanoporous CO 2 “molecular basket” adsorbent has been developed and applied in the separation of CO 2 from the flue gas of a natural gas fired boiler. The nanoporous CO 2 “molecular basket” adsorbent was prepared by uniformly dispersing polyethylenimine (PEI) into the pores of mesoporous molecular sieve MCM-41. The use of MCM-41 and PEI had a synergetic effect on the CO 2 adsorption. The rates of CO 2 adsorption/desorption of PEI were also greatly improved. Adsorption separation results showed that CO 2 was selectively separated from simulated flue gas and flue gas of a natural gas-fired boiler by using this novel adsorbent. The adsorbent adsorbed very little N 2, O 2 and CO in the flue gas. Moisture had a promoting effect on the adsorption separation of CO 2 from flue gas. The adsorbent simultaneously adsorbed CO 2 and NO x from flue gas. The adsorbed amount of CO 2 was around 3000 times larger than that of NO x . The adsorbent was stable in several cyclic adsorption/desorption operations. However, very little NO x desorbed after adsorption indicating the need for pre-removal of NO x from flue gas before capture of CO 2 by this novel adsorbent.
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