Catalytic Activity of Various Ultramarines for Dehydration of 2-Propanol

Abstract

The catalytic activities of ultramarine blue, violet and pink for the dehydration of 2-propanol were examined at 473 K using a closed circulation system. The order of the activity of these ultramarines was as follows; ultramarine pink>ultramarine violet>>ultramarine blue. Infrared spectra of these ultramarines indicated that there existed the acidic hydroxyl groups and ammonium ions on the surface of ultramarine pink and violet. It was concluded that high activities of ultramarine pink and violet for the dehydration of 2-propanol were attributed to the existence of the Bronsted acid sites on the surface of these ultramarines.