279550 The Importance of Transport Processes in Silica-Supported, Polyethyleneimine-Impregnated CO2 Sorbents

Tuesday, October 30, 2012: 8:30 AM
405 (Convention Center )
David S Mebane1, Curtis B Storlie2, Leslie M. Moore2, K. Sham Bhat2, Joel D. Kress2, Daniel J. Fauth3 and McMahan L. Gray3, (1)National Energy Technology Laboratory, Morgantown, WV, (2)Los Alamos National Laboratory, Los Alamos, NM, (3)National Energy Technology Laboratory, Pittsburgh, PA

THe U.S. Department of Energy's Carbon Capture Simulation Initiative (CCSI) is a DOE-wide project focused on the accelerated upscaling of new carbon capture technologies through science-based simulation.  Polyethyleneimine (PEI)-based sorbent processes are one of the primary focuses of the project.  Experimental evidence indicates that CO2  transport through the bulk of the amine polymer is a significant limiting factor in the capacity of these sorbents.  A microstructurally sensitive model for the uptake of CO2 in mesoporous silica-supported PEI sorbents has been implemented.  The model includes a two-step reaction mechanism for the adsoprtion of CO2 in dry conditions, along with transport in the mesopores and in the bulk of PEI.  This talk will present the results of a parametric study that demonstrates the importance of the stability of diffusive intermediates – with the zwitterions as a prime candidate – in the sorbent capacity.  Statistically sensitive comparisons with experimental data will also be made.

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