Direct detection of a phase change in PdO/CeO2 supported on chi-Al2O3 by means of in situ high-temperature measurements of XRD and FTIR.
Phase changes between PdO and Pd metal can be directly detected in PdO/CeO2 catalysts supported on chi-Al2O3 by means of in situ high-temperature measurements of X-ray diffraction and FT-IR in relation to the catalytic activity for the methane oxidation of microcrystalline PdO. Reversible changes in the solid phases are observed from PdO to Pd and Pd to PdO under O2-deficient and O2-excess atmospheres, respectively. Nanosizes of PdO and Pd crystallites, the distorted PdO crystal structure along the (110) plane, and also a distorted Pd metal crystal structure along the (200) plane as well as the large surface area elucidate the high catalytic activity for the methane oxidation of PdO/CeO2 catalysts prepared with an atomic ratio of Pd:Ce = 1:1.
Kanezaki
Eiji
E
Department of Chemical Science and Technology, Faculty of Engineering, The University of Tokushima, Minami-Josanjima, Tokushima, Japan. kanezaki@chem.tokushima-u.ac.jp
Tanaka
Suminori
S
Murai
Kei-ichiro
K
Moriga
Toshihiro
T
Motonaka
Junko
J
Katoh
Masahiro
M
Nakabayashi
Ichiro
I