CPOM over ZrO2-based oxide catalysts was studied by transient experiments. The oxidation products, i.e., CO, CO2, H2O, and H2, did not contain any 18O, after pulsing a mixture of CH4 and 18O2 (2:1) over YSZ catalysts at 500°-900°C. Thus, CH4 was oxidized by lattice oxygen of the catalysts. The consumed oxygen was restored by gas phase oxygen via oxygen exchange with the oxide. Interaction between gas phase oxygen and intrinsic oxygen vacancies in ZrO2 and oxygen vacancies generated by doping Y2O3 in ZrO2 was discussed. Catalytic performance was very sensitive to segregation of extremely low-level contaminations like earth alkali oxides. The effect of traces of contaminations on the catalytic performance was also elucidated. This is an abstract of a paper presented at the 228th ACS National Meeting (Philadelphia, PA 8/22-26/2004).
|Journal||Abstracts of papers of the American Chemical Society|
|Publication status||Published - 2004|
|Event||228th American Chemical Society National Meeting (ACS): 228th ACS National Meeting - Philadelphia, U.S.A.|
Duration: 25 Aug 2004 → 27 Aug 2004