On the Correlation of Ni Oxidation States and Electronic Conductivity of the Catalyst with Catalytic Activity for H2O2 decomposition on (R,A)NiO3-ä (R=lanthanides, A=alkaline Earth) Perovskites

J. A. ALONSO; M. J. MARTÍNEZ-LOPE; H. FALCÓN; R. E. CARBONIO

Royal Society of Chemistry

Año: 1999 vol. 1 p. 3025 - 3025

p style="TEXT-ALIGN: justify; LINE-HEIGHT: 200%; MARGIN: 0cm 0cm 0pt; TEXT-AUTOSPACE: ; mso-layout-grid-align: none" class="MsoNormal">Several Ni-containing perovskite-related oxides of stoichiometries RNiO3 (R=La, Pr, Eu),  La1-xAxNiO3 (A= Sr, Th), LaNiO2.5, BaNiO2 and BaNiO3 were studied as catalysts for hydrogen peroxide decomposition. In all cases the samples were single-phase materials characterized structurally by X-ray and neutron powder diffraction. In these perovskites, Ni cations exhibited oxidation states between 2+ and 4+, as previously determined by thermogravimetric (TG) analysis under reducing conditions. In a set of samples prepared at 1000o C under 200 bar of O2 pressure, the catalytic acti