Abstract
The acid-base and oxidizing properties and the structures of ZrOn prepared with ammonia or urea and ZrO 2 treated with sulfuric acid or ammonium sulfate have been investigated. The treatment of ZrO 2 with so 4 2− caused the remarkable increases in the phase transition temperature to monoclinic form, the surface area and the acid strength and the appearance of the oxidizing property. The acid strength was higher for ZrO 2 treated with H 2SO 4 than for ZrO 2 treated with (NH 4) 2SO 4, though the surface area was the reverse. The difference between ammonia and urea as precipitating reagents caused no difference in crystallography and acid strength, but the surface areas of ZrO 2-A and ZrO 2-A-H 2SO 4 prepared with ammonia were higher than those of ZrO 2-U and ZrO 2-U-H 2SO 4 prepared with urea, respectively.
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