Colored sodalite and A zeolites

In this work, ultramarine-like pigments were obtained in one step synthesis from NaA zeolite, sodium carbonate, and sulfur as precursors. To reduce the typical synthesis temperature (higher than 600 degrees C), sealed tubes were used. Ultramarine-like pigments were successfully synthesized at temperatures lower than 400 degrees C. The ratio S/Na2CO3 was varied, and the percentage of sulfur/gram of zeolite remained constant.