TY - JOUR
T1 - Effect of stability and diffusivity of extra-framework oxygen species on the formation of oxygen radicals in 12CaO-7Al2O3
AU - Hayashi, Katsuro
AU - Ueda, Naoto
AU - Hirano, Masahiro
AU - Hosono, Hideo
N1 - Funding Information:
This work was supported by a Grant-in-Aid for Creative Scientific Research (No. 166-50205) from the Japanese Ministry of Education, Culture, Sports, Science and Technology.
PY - 2004/9/30
Y1 - 2004/9/30
N2 - The thermodynamics and kinetics of oxygen radical formation process in a nanoporous crystal, 12CaO-7Al2O3, were examined by isothermal annealing experiments in dry atmospheres. It is clarified that the formation of oxygen radicals, O-2 and O-, in the crystal occurs in the following three steps; outward diffusion of extra-framework oxide ions, its oxidation by absorbed oxygen molecules to form O- and O-2 at the surface, and subsequent inward diffusion of the oxygen radicals. The instability of the extra-framework oxide ions is essentially the driving force for the process. Further, the analyses allow to predict the total oxygen radical content for a given annealing condition.
AB - The thermodynamics and kinetics of oxygen radical formation process in a nanoporous crystal, 12CaO-7Al2O3, were examined by isothermal annealing experiments in dry atmospheres. It is clarified that the formation of oxygen radicals, O-2 and O-, in the crystal occurs in the following three steps; outward diffusion of extra-framework oxide ions, its oxidation by absorbed oxygen molecules to form O- and O-2 at the surface, and subsequent inward diffusion of the oxygen radicals. The instability of the extra-framework oxide ions is essentially the driving force for the process. Further, the analyses allow to predict the total oxygen radical content for a given annealing condition.
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U2 - 10.1016/j.ssi.2004.07.057
DO - 10.1016/j.ssi.2004.07.057
M3 - Article
AN - SCOPUS:10044284083
SN - 0167-2738
VL - 173
SP - 89
EP - 94
JO - Solid State Ionics
JF - Solid State Ionics
IS - 1-4 SPEC. ISS.
ER -