Abstract
Effects of steam and CO 2 treatments of the potassium-promoted iron oxide on the dehydrogenation activity and the crystal structure were examined at 620 °C. The steam treatment remarkably increased the activity for the formations of styrene, benzene and toluene, while the CO 2 treatment decreased the activity. The crystal structure and surface state of the catalyst were investigated by using XRD and XPS. Potassium ferrite of cristobalite type structure formed on the surface of iron oxide was presumed as an active phase for the reactions.
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