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CO2 Reduction with Zn Particles in a Packed-Bed Reactor

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Publication date 2011
Author Loutzenhiser PG, Barthel F, Stamatiou A, Steinfeld A,
Project Reduction of CO2 via two-step solar thermochemical cycles using redox pairs - thermodynamics, kinetics, and reactor technolog
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Original article (peer-reviewed)

Volume (Issue) 57(9)
Page(s) 2529 - 2534
Title of proceedings AICHE JOURNAL
DOI 10.1002/aic.12460


A two-step solar thermochemical cycle for splitting CO2 with Zn/ZnO redox reactions is considered, consisting of: (1) the endothermic dissociation of ZnO with concentrated solar radiation as the heat source and (2) the non-solar, exothermic, reduction of CO2 to CO by oxidizing Zn to ZnO; the latter is recycled to the first step. The second step of the cycle is investigated using a packed-bed reactor where micron-sized Zn particles were immobilized in mixtures with submicron-sized ZnO particles. Experimental runs were performed for Zn mass fractions in the range 67–100 wt % and CO2 concentration in the range 25–100%, yielding Zn-to-ZnO conversions up to 71% because of sintering prevention, as corroborated by SEM analysis.