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Introduction Among various metal oxide catalysts, iron oxides have attracted much attention in recent years due to their structural characteristics and physico-chemical properties [ 1 – 5 ]. Besides their catalytic potential

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impregnation using Fe(acac) 3 as precursor. This method was used in order to avoid exchange and, thus to promote the formation of iron oxide aggregates. Experimental part Catalyst preparation Starting

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fluorite grains and their associations 4.2.6 Iron oxide minerals (Jarosite) It is a hydrous sulfate mineral with potassium and iron; it is formed in the ore deposits by the oxidation of iron sulfides. The studied jarosite grains have yellowish to reddish

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, and biotechnology [ 8 , 10 , 11 ]. Iron oxides and other iron-containing nanoparticles have widely been studied among the magnetic nanomaterials. Although different methods for the synthesis of magnetic nanoparticles have been developed, some of them

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Fe(III)–oxalate complex has a much higher photoactivity for producing hydroxyl radicals under irradiation than Fe(OH) aq 2+ . Furthermore, oxalate is particularly effective at dissolving iron oxides both by complexation and by reduction [ 35 ], which

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the addition of various transition metals into the spinel lattice. Incorporation of copper to the iron oxide spinels showed considerable shift in hematite reduction temperature, while Mn, Co, Ni, Zn, Ce etc. showed varied impacts. In the field

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% ( Fig. 2 ), in view of a previous study [ 14 ], belongs to iron ions in solid solution. The sextet component of the sample has the parameters of iron oxide (α-Fe 2 O 3 , hematite) with relative weight G = 98%. Fig. 2

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J. , Banerjee , S. , Mohapatra , S. K. , Smith , Y. R. , Misra M. ( 2011 ) Bismuth iron oxide nanoparticles as photocatalyst for solar hydrogen generation from water . Journal of Fundamentals of Renewable Energy and

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. Reduction of the sample in hydrogen results in the formation of highly stable Fe 2+ species that can agglomerate to iron oxide clusters during the structure disorder. At low reaction temperature and hydrogen partial pressure, these clusters are more

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studied gold on CoO x , MnO x , CuO, Fe 2 O 3 and CeO 2 in the total oxidation of methane, ethane and propane and Au/CoO x was shown as the most effective catalyst [ 24 ]. Gold supported on iron oxide and ceria have been reported as active catalysts in

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