Study of ozygen desorption from substituted perovskites: New possibilities through fast intermittent temperature-programmed desorption
(0) A differential desorption technique, named intermittent temperature-programmed desorption (ITPD), has been used to get new insights into the properties of La1-xSrxCo0.8Fe0.2O3-δ perovskites. The apparent activation energy of desorption (Eapp) and the frequency factor (v) were calculated from ITPD data, for the two distinct oxygen species desorbing from perovskite at temperatures lower than 400℃. The low values (about 107-108 s-1) obtained for v(app) indicated that re-adsorption occurred during the TPD process and therefore that E(app) is equal to the Heat of adsorption (E=-ΔH). The first oxygen species, related to lower desorption temperatures, exhibits a distribution of E from 105 to 125 kJ mol-1. The second one, related to higher desorption temperatures, corresponds to E=146 ±4 kJ mol-1 and 139 ± 5 kJ mol-1, for x=0.2 and x=0.3, respectively. The relative amounts of these species contributing to the desorption peak are dependent upon Sr content in the perovskite.
Perovskite Temperature-programmed desorption TPD ITPD Ozygen
F.Gaillard J.-P.Joly Ning Li A.Boreave J.-P.Deloume
IRCELYON, Institut de recherches sur la catalyse et lenvironnemenl de Lyon, 2 avenue Albert Einstein, Villeurbanne, F-69626 cedex, France CNRS, UMR5256, Villeurbanne F-69626, France Universite de Lyon, Villeurbanne, F-69622, France
国际会议
The 16th International Conference on Solid State Ionics(第十六届国际固态离子学会议)
上海
英文
941-945
2007-07-01（万方平台首次上网日期，不代表论文的发表时间）