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CO 2 reduction with Zn particles in a packed‐bed reactor
Author(s) -
Loutzenhiser Peter G.,
Barthel Frank,
Stamatiou Anastasia,
Steinfeld Aldo
Publication year - 2011
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.12460
Subject(s) - exothermic reaction , oxidizing agent , endothermic process , packed bed , thermochemical cycle , dissociation (chemistry) , redox , chemical engineering , materials science , chemistry , zinc , analytical chemistry (journal) , adsorption , metallurgy , catalysis , chromatography , organic chemistry , hydrogen production , engineering
Abstract A two‐step solar thermochemical cycle for splitting CO 2 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 CO 2 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 CO 2 concentration in the range 25–100%, yielding Zn‐to‐ZnO conversions up to 71% because of sintering prevention, as corroborated by SEM analysis. © 2010 American Institute of Chemical Engineers AIChE J, 2011