An electron spin resonance (EPR) investigation was carried out on the paramagnetic forms of defects present on the surface of ZnO-supported ruthenium (Ru/ZnO) and on pure ZnO. Ionized zinc defects (Zn+) appear fully depopulated by the electron transfer to the noble metal. Ionized oxygen vacancies (V(O)+) undergo changes by reaction with the surrounding atmosphere. The interaction of Ru/ZnO with a 6% mixture of CO in air led to new vacancies, whereas with a 2% mixture of H-2 in air the oxygen removed from regular lattice sites by the reducing gas was balanced by that introduced in the same sites by air. It may thus be suggested that ruthenium can activate both reducing and oxidizing gas components.
Morazzoni, F., Scotti, R., Dinola, P., Milani, C. (1992). N-ZNO-SUPPORTED RUTHENIUM - THE METAL/N OXIDE INTERACTION AS STUDIED BY THE EFFECT OF THE SURROUNDING ATMOSPHERE ON THE PARAMAGNETIC PROPERTIES. GAZZETTA CHIMICA ITALIANA, 122(11), 471-473.
N-ZNO-SUPPORTED RUTHENIUM - THE METAL/N OXIDE INTERACTION AS STUDIED BY THE EFFECT OF THE SURROUNDING ATMOSPHERE ON THE PARAMAGNETIC PROPERTIES
MORAZZONI, FRANCA;SCOTTI, ROBERTO;MILANI, CARLO
1992
Abstract
An electron spin resonance (EPR) investigation was carried out on the paramagnetic forms of defects present on the surface of ZnO-supported ruthenium (Ru/ZnO) and on pure ZnO. Ionized zinc defects (Zn+) appear fully depopulated by the electron transfer to the noble metal. Ionized oxygen vacancies (V(O)+) undergo changes by reaction with the surrounding atmosphere. The interaction of Ru/ZnO with a 6% mixture of CO in air led to new vacancies, whereas with a 2% mixture of H-2 in air the oxygen removed from regular lattice sites by the reducing gas was balanced by that introduced in the same sites by air. It may thus be suggested that ruthenium can activate both reducing and oxidizing gas components.
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