الفهرس 
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Abstract
In this respect, the preparation of pure zinc/manganese mixed oxide (Z1M2) and its doping with Li2O (Li1Z1M2 and Li4Z1M2) using mechanical-mixing method to be calcined at 400, 500, 700 and 800 ºC. Characterization of the prepared mixed oxides using XRD, EDX, FTIR, TGA, DSC and TEM. Test the catalytic activity of prepared mixed oxides towards H2O2 decomposition reaction at 30, 40 and 50 ºC. XRD, the degree of crystallinity of ZnMn2O4 increases with increasing the calcination temperature. Doping with Li2O enhancing the crystanillity of ZnMn2O4 decreasing the crystanillity of Mn2O3 and ZnO phases and increasing the crystallite size. EDX, the Mn surface concentration is higher than that in the bulk, the increase in calcination temperature from 400 to 1000 ºC led to decrease the Mn/Zn ratio on the surface. TEM results confirmed the results obtained from XRD technique for Z1M2 (calcined at 400, 600 and 800 ºC) and Li4Z1M2 (calcined at 400, 600 and 800 ºC). The TGA thermograms display two distinct processes. The DSC thermograms display two endothermic and one exothermic peak due to the liberation of water of crystallization + carbon dioxide and the formation of manganite, respectively. The production of the spinel ZnMn2O4 structure was confirmed by FTIR spectra. catalytic activity of the investigated solids was tested for the decomposition of H2O2 in aqueous solution at 30, 40 and 50 °C.