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Millimeter-sized spherical silica foam supports with hierarchical mesoporous–macroporous structure were prepared using agar addition, foaming, and drop-in-oil method, and they were modified with polyethyleneimine (PEI) by a wet impregnation process for CO2 capture. CO2 sorption capacity of the millimeter-sized spherical sorbents increased as amount of PEI impregnation increased. However, the CO2 sorption...
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