Zeitschrift für Thermodynamik und Katalyse
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Abstrakt

Effect of Ag-doping of Nanosized FeAlO System on its Structural, Surface and Catalytic Properties

Laila I. Ali, Sahar A. El-Molla, Nabil H. Amin, Anwer A. Ebrahim and Hala R. Mahmoud

The effects of Ag2O-doping on the physicochemical, surface and catalytic properties FeAlO system with various extent of Fe2O3 loading have been investigated. The dopant concentration was changed between 1.5 and 4.0 mol % Ag2O. Pure and variously doped solids were subjected to heat treatment at 400-800?C. The techniques employed for characterization of catalysts were TG/DTG, XRD, N2-adsorption at ?196?C and the catalytic decomposition of H2O2 at 25-40?C. The obtained results revealed that, the investigated catalysts consisted of nanosized ?-Al2O3 phase. The textural properties including SBET, porosity and St were modified by Ag2O-doping. The doping process with Ag-species improved the catalytic activity of FeAlO system. Increasing the precalcination temperature from 400 to 800?C increased the catalytic activity (k30°C) of 3.5 % AgFeAlO with 1.9 fold towards H2O2 decomposition. Furthermore, the maximum increase in the k30°C value due to doping with 3.5 mol% Ag2O attained about 15.1 fold for the solids calcined at 800°C.