Reactivity of surface and bulk oxygen in La1-xCaxFeO3-y system with respect to methane oxidation

The reactivity and mobility of the surface and lattice oxygen in a La_1-xCa_xFeO_3-y system prepared via a ceramic route were studied by using CH₄-TPR. While the middle-temperature (400-700^oC) oxygen lattice mobility reaches maximum for samples with disordered anion vacancies, the high-temperature lattice oxygen flux appears to be controlled by a rapid transfer along disordered domain walls. In the high-temperature range, a high selectivity to syngas of methane oxidation by the lattice oxygen was achieved both for pure lanthanum ferrite and for samples with a microdomain structure. This revised version was published online in August 2006 with corrections to the Cover Date.