Hydroxyl Sodalite Having Combustion Gas Purification Function

Abstract

Hydroxyl sodalite (Na8Al6Si6O24(OH)2) was investigated to develop a new ecofunctional material having removal performance for toxic substances including in combustion gas. Hydroxyl sodalite has nanometer-sized micro pore (β-cage) in the structure, and Cl- ions derived from HCl gas were fixed in the pores above 400 °C. The amount of Cl- ion fixed increased with increasing reaction temperature, and was the greatest, 7.3 wt% at 800 °C. In addition, it was found that Cu2+ ions were fixed in sodalite structure by substitution with Na+ ions by solid (hydroxyl sodalite) - gas (gaseous CuCl2) reaction. The substitution quantity increased with increasing reaction temperature. The amount of Cu2+ ion substituted was 10.5 wt% as CuO at 900 °C. From the above results, it was concluded that hydroxyl sodalite is an ecomaterial which is useful for combustion gas purification in the high temperatures.