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Reduction Study of Iron-Alumina Binary Oxide Fe2-xAlxO3

Jóźwiak W. K., Maniecki T. P., Mierczyński P., Bawolak K., Maniukiewicz W.

Polish Journal of Chemistry

2009

Vol. 83, nr 12

2153-2162

The comparative study of iron-aluminum binary oxides Fe2-xAlxO3 (where x = 2/3, 1, 4/3) reduction behavior was investigated and the obtained bi-oxides were characterzed by TPR, TG-DTA, BET and XRD methods. In hydrogen atmosphere three step reduction path way for iron-aluminum binary oxide was found. Such reduction behavior appeared reasonably analogical to that characteristic of hematite type iron(III) oxide reduction 3Fe2O3 rightwards arrow 2Fe3O4 rightwards arrow 6FeO rightwards arrow 6Fe. The reduction for unimolar bi-oxide Fe2-xAlxO3 (x = 1) can be expressed in following way: 4FeAlO3 rightwards arrow 2Fe2AlO4 rightwards arrow 2FeAl2O4 + 2Fe rightwards arrow 4Fe but the last step of reduction was not accomplished below 1000°C. In air FeAlO3 bi-oxide decomposes above 1300°C, whereas exothermal dissociation 2FeAlO3 rightwards arrow alfa-Al2O3 and alfa-Fe2O3 above 770°C was con firmed in argon atmosphere.

Methanol Synthesis from Mixture of CO, CO2 and H2 under Atmospheric Pressure over Au, Ag-Cu/FeAlO3 Supported Catalysts

Maniecki T. P., Mierczyński P., Maniukiewicz W., Bawolak K., Gebauer D., Jóźwiak W. K.

Polish Journal of Chemistry

2008

Vol. 82, nr 12

2379-2388

The influence of copper and noble metal (Ag, Au) addition on the physicochemical properties of support FeAlO3 and supported metal catalysts was studied. The reaction of methanol formation in the temperature range 200-380 graduate C under atmospheric pressure over a series of Cu and M-Cu catalysts (where M = Ag, Au) has been investigated. The presence of spinel like type structures FeAlO3, Fe2AlO4 and FeAl2O4 was confirmed by XRD technique. The physicochemical properties of supports and supported copper and bimetallic Ag, Au-Cu/FeAlO3 catalysts were examined by BET, TPR, and XRD methods.