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Aerogel and xerogel catalysts based on sulfated zirconia doped with chromium are prepared by sol–gel method. The effects of drying mode and calcination temperature are reflected in the characteristics of the final solids. The addition of chromium to aerogel sulfated zirconia not only provides an important development of the specific surface area from 100 to 213 m2 g−1; but also stabilizes a pure metastable...