EFFECT OF THE SURFACE/BULK DOPING OF LANTHANUM MANGANITE ON THE OXYGEN MOBILITY,REACTIVITY AND CATALYTIC ACTIVITY IN THE CO OXIDATION

摘要

Dispersed samples of LaMnO_3 prepared by the Pechini method and annealed at 500 deg C were doped with cations of a different charge and size (Ce,Fe,Bi,Sr+Bi),while the sample surface was modified with Pt.The effects of the doping and of the surface modification on the oxygen mobility (as estimated by O_2 TPD) in the samples and on their reactivity (as estimated by CO TPR) as related to the catalytic activity in the CO oxidation are considered.