Abstract: Effects of conditions for preparation ofSO₄^2-/ZrO₂ solid superacid, such as concentration of H₂SO₄, calcination temperature,calcination time with respect to its catalytic activity were studied.Results showed that as calcination temperature increased,catalytic activity ofSO₄^2-/ZrO₂ catalysts decreased under lower concentration of H₂SO₄ and calcination time 3 h.Catalytic activity was not obviously affected by calcinations time under lower concentration of H₂SO₄ and lower calcination temperature,while products distribution was affected to a certain extent.SO₄^2-/ZrO₂ solid superacid was used to catalyze α pinene isomerization at 130℃±2℃,mass part of catalyst 4% to give results of α pinene conversion at 88.8%,and camphene selectivity at 55.4%.Hammett constants of several catalysts were measured,and surface properties ofSO₄^2-/ZrO₂ catalysts were tested by TEM.

Key words: SO₄^2-/ZrO₂ catalyst, solid superacid, α-pinene isomerization