La. Isupova et al., Nature of the perovskites surface centers as studied by the Infrared spectroscopy of adsorbed NO test molecule, J MOL CAT A, 158(1), 2000, pp. 275-280
FTIR spectroscopy of adsorbed NO revealed a variety of types of coordinativ
ely unsaturated surface cations for lanthanum cobaltites, manganites, and f
errites, some of which emerge due to room-temperature surface reduction by
the test molecule. For the surface of LaFeO3, clusters of coordinatively un
saturated Fe2+ cations associated with surface defects dominate. For the su
rface of LaCoO3 and LaMnO3, coordinatively unsaturated Me+3 cations are mai
nly revealed, being more coordinated by oxygen for the former system. These
results could be used to analyze the catalytic properties of perovskites i
n the reaction of CO oxidation, provided the density of surface sites and r
eaction mechanism are taken into account. (C) 2000 Elsevier Science B.V. Al
l rights reserved.