Copptd. Fe-Sb-Ti mixed oxides with an (Fe + Sb)/(Fe + Sb + Ti) at. ratio in the 0-1 range and with an Sb/Fe at. ratio of 2.0 were characterized by means of x-ray diffraction, Moessbauer and IR spectroscopies, and by attrition resistance tests.. Catalysts were tested in the oxidn. of propene to acrolein. Catalysts with high and similar selectivities (80-90%) are obtained in the 0.3-1.0 (Fe + Sb)/(Fe + Sb + Ti) at. ratio range where x-ray diffraction anal. shows the presence of either only a single cryst. rutile phase or a single rutile phase together with α- and β-Sb2O4 in variable amts. No correlation was found between selectivity to acrolein and the presence of cryst. Sb2O4. On the contrary, selectivity to acrolein seems to be assocd. with Sb ions stabilized at the surface of the catalyst. The results of physicochem. characterization and interpretation thereof are consistent with the cryst. rutile-like single phase being constituted by a solid soln. originating from either FeSbO4, FeSbO4 doped with Ti, and TiO2 doped with Fe and Sb phases, or a lattice of largely uniform periodicity, but with localized variations in compn. [on SciFinder(R)]

Propylene oxidation to acrolein on iron-antimony-titanium-oxygen catalysts

CENTI, Gabriele;
1987

Abstract

Copptd. Fe-Sb-Ti mixed oxides with an (Fe + Sb)/(Fe + Sb + Ti) at. ratio in the 0-1 range and with an Sb/Fe at. ratio of 2.0 were characterized by means of x-ray diffraction, Moessbauer and IR spectroscopies, and by attrition resistance tests.. Catalysts were tested in the oxidn. of propene to acrolein. Catalysts with high and similar selectivities (80-90%) are obtained in the 0.3-1.0 (Fe + Sb)/(Fe + Sb + Ti) at. ratio range where x-ray diffraction anal. shows the presence of either only a single cryst. rutile phase or a single rutile phase together with α- and β-Sb2O4 in variable amts. No correlation was found between selectivity to acrolein and the presence of cryst. Sb2O4. On the contrary, selectivity to acrolein seems to be assocd. with Sb ions stabilized at the surface of the catalyst. The results of physicochem. characterization and interpretation thereof are consistent with the cryst. rutile-like single phase being constituted by a solid soln. originating from either FeSbO4, FeSbO4 doped with Ti, and TiO2 doped with Fe and Sb phases, or a lattice of largely uniform periodicity, but with localized variations in compn. [on SciFinder(R)]
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11570/1907363
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