Nature of the perovskites surface centers as studied by the Infrared spectroscopy of adsorbed NO test molecule

Citation
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
Citations number
19
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
ISSN journal
13811169 → ACNP
Volume
158
Issue
1
Year of publication
2000
Pages
275 - 280
Database
ISI
SICI code
1381-1169(20000908)158:1<275:NOTPSC>2.0.ZU;2-U
Abstract
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.