Carbon Dioxide Capture Performance of Immobilized Amine Aminosilane Sorbents

Thursday, November 11, 2010: 3:57 PM
250 A Room (Salt Palace Convention Center)
McMahan L. Gray, Deborah C. Hreha, Daniel J. Fauth, James S. Hoffman and Henry W. Pennline, U.S. Department of Energy, National Energy Technology Laboratory, Pittsburgh, PA

Immobilized amine sorbents were prepared by using a hyper-branched polyethyleneimine (PEI) that was cross-linked with various aminosilanes (AS) to promote stability under high water simulated flue gas conditions. The PEI/AS was immobilized within silicon dioxide (SiO2) based substrates at various weight ratios and was tested in dry and moist simulated flue gas conditions (up to 90% moisture by volume) to determine the optimum formulation for these PEI/AS cross-linked sorbents. Initial performance capture capacities of these PEI/AS cross-linked sorbents were also determined by thermogravimetric analyses (TGA) in both dry and humidified CO2 gas streams to determine loading capacities. The regenerable PEI/AS cross-linked sorbents investigated in this study exhibit acceptable CO2 capture capacities of 2.5 to 3.5 mole CO2/kg sorbent as determined in testing with TGA and a laboratory-scale fix bed reactor. PEI/AS cross-linked sorbents were stable over the adsorption/desorption temperature range of 25-105 oC for multiple cycles under dry and high water simulated flue gas conditions. Furthermore, these PEI/AS cross-linked sorbents were scaleable for production and will be tested in a pilot scale capture reactor. The performance of these PEI/AS cross-link sorbents under the described conditions will be discussed in this paper.

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See more of this Session: CO2 Capture by Adsorption I
See more of this Group/Topical: Separations Division