High-Pressure Reduction Kinetics of Ca2Fe2O5 for Advanced Chemical Looping Steam Reforming
Year: 2025
Type: article
Abstract: Ca 2 Fe 2 O 5 stands out as a promising oxygen carrier for chemical looping applications due to its remarkable redox stability and its ability to be completely regenerated by H 2 O while producing a pure H 2 stream. This work systematically investigates the effect of pressure (1 to 20 bar) on the reduction kinetics and the stability (up to 50 cycles) of this oxygen carrier. A comprehensive kinetic model has been developed by integrating experimental data and structural observations, making use of the nucleation and growth (JMAEK) model with an Avrami exponent of 1.5. The total pressure was found to have only a negligible effect on the reduction rate, while the temperature and H 2 mole fraction in the feed dominated the kinetics. Steam oxidation was governed by internal mass transfer limitations under the experimental conditions adopted, leading to lower reaction rates as the total pressure increases due to a decrease in the effective diffusivity of the gas. These findings demonstrate the cyclic stability of Ca 2 Fe 2 O 5 under pressurized conditions and pave the way for its application in the implementation of high-pressure integrated chemical looping processes.
Institutions: University of Udine, Eindhoven University of Technology
Language: English
Subfield: Biomedical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4410258686