抄録
Oxygen release property of ceria (CeO2) in ceria/alumina composite powder by hydrogen was examined by the temperature-programmed reduction technique below the temperature of 600 °C. The results suggested the strong interaction and the structural relaxation at the interface of CeO2 and Al2O3 after the redox treatment at low temperatures. The activation energy of oxygen release by hydrogen was determined as 85 ± 15 kJ/mol for the interface of CeO2/Al2O3. Furthermore it increased to 194 ± 25 kJ/mol after the redox treatment, because oxygen was stabilized at the interface between alumina and ceria. This means that the interface is stabilized to produce the relaxed structure of interface in which oxygen is also stabilized.
