Oxidation kinetics of YBaCo4O7+δ and substituted oxygen carriers.

ABSTRACT: In this paper, the relaxation kinetics of the oxidation process of the YBaCo4O7+δ , Y0.95Ti0.05BaCo4O7+δ and Y0.5Dy0.5BaCo4O7+δ oxygen carriers is studied with isothermal reaction data. XRD analysis for fresh samples shows that all the samples have YBaCo4O7+δ structure. Scanning electron microscopy images of samples show that the samples consist of porous agglomerates of primary particles. Isothermal TG experiments are conducted with temperatures of 290°C, 310°C, 330°C and 350°C, respectively. It is found that the Avrami-Eroféev model describes solid-phase changes in the oxygen absorption process adequately. The results show that the distributed activation energies of the oxidation process obtained by the Avrami-Eroféev model are 42.079 kJ mol-1, 42.944 kJ mol-1 and 41.711 kJ mol-1 for the

SUBMITTER: Hou L 

PROVIDER: S-EPMC6030326 | biostudies-literature | 2018 Jun

REPOSITORIES: biostudies-literature