Catalytic properties of the system Al2O3-Fe2O3
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An investigation was made of the effect of composition and thermal treatment conditions of A12O3-Fe2O3 catalysts on the specific activity in the dehydration (Asp) and dehydrogenation(A′sp) of i-C3H7OH at 260–290°.
Dehydration of alcohol occurs on the A12O3 phase with Fe2O3 dissolved in it. The addition of Fe2O3 strongly reduces Asp of Al2O3, though it also passes through a maximum at 32–40 mol. % of Fe2O3. With a rise in catalyst firing temperature from 400 to 750°, Asp increases.
Dehydrogenation, which is caused by the solid solution of A12O3 in Fe2O3, becomes appreciable with an Fe2O3 content of 18 mol. %; A′sp increases rapidly and nonlinearly with an increase in Fe2O3 concentration and a rise in catalyst firing temperature.
A′sp for catalysts fired at 400° (all paramagnetic) changes with composition symbatically with the value of the magnetic susceptibility. No relation was observed between the ferromagnetism of catalysts and A′sp.
Although some Al2O3-Fe2O3 catalysts have a considerably greater specific surface, their over-all dehydrating activity is lower than that of Al2O3 obtained under analogous conditions.
KeywordsAlcohol Al2O3 Solid Solution Fe2O3 Dehydration
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