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The objective of this study was to establish the reaction kinetics involved in redox cycles of the CaMn0.9Mg0.1O3−δ material to be used as an oxygen carrier in the chemical-looping-combustion process. The oxygen-transport capacity and reactivity of this material during consecutive reduction and oxidation steps with gaseous compounds (CH4, H2, CO, and O2) were studied in a thermogravimetric analysis apparatus. The oxygen uncoupling properties of this material were also analyzed. It was found that material reactivity increased with the number of redox cycles, whereas the oxygen-transport capacity decreased with the cycle number until it was stabilized or “activated”. Conversion versus time curves at different temperatures (973–1273 K) and reacting gas concentrations (5–60 vol %) were used for kinetic determination. The grain model with control by chemical reaction and diffusion through the product layer was used to obtain the kinetic parameters for fresh and “activated” particles.This paper is based on the work produced within the framework of the INNOCUOUS\ud(Innovative Oxygen Carriers Uplifting Chemical Looping Combustion) Project, funded by the European Commission under the seventh Framework Programme (Contract 241401). Authors would like to thank Frans Snijkers from VITO and Prof. Anders Lyngfelt from Chalmers University of Technology for having supplied CaMn0.9Mg0.1O3-- material.Peer reviewe

Reduction and Oxidation Kinetics of a CaMn0.9Mg0.1O3−δOxygen Carrier for Chemical-Looping Combustion

Reduction and Oxidation Kinetics of a CaMn_0.9Mg_0.1O_3−δOxygen Carrier for Chemical-Looping Combustion