A new method is described in which raw materials prepared by mixing kaolin and concentrated acid are heated in a furnace at temperatures between 100 and 700°C. Experiments with HCl, HNO3, H3PO4, and H2SO4 showed that only H2SO4 gave high reaction yields, which grew steadily as reaction temperature was raised. Reaction products were mostly Al2(SO4)3. Leached kaolin samples showed BET specific surface areas of over 100 m2 g-1. Furthermore, reaction between kaolin and H2SO4 required no previous calcination of kaolin.
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