关键词: SO₄^2-/ZrO₂-TiO₂型催化剂, α-蒎烯异构化, 固体超强酸

Abstract: Solid superacids of SO₄^2-/ZrO₂-TiO₂ type were prepared and used as the high-activity catalysts for (α-pinene) isomerization in this study.The products of isomerization reaction were identified by using GC-MS.In the (isomerization) reaction,the main product is camphene,and by-products are tricyclene and α-terpinene.Effects of conditions for preparation of SO₄^2-/ZrO₂-TiO₂ catalysts,such as ratio of Ti to Zr,concentration of H₂SO₄,calcination temperature with respect to its catalytic activity,were investigated.Results showed that the optimum conditions for the preparation of SO₄^2-/ZrO₂-TiO₂ catalysts are as follows: ratio of Ti to Zr 4(molar ratio),calcinations temperature 600℃,and H₂SO₄ concentration 0.5 mol/L.Under these conditions,the main factors affecting the reaction were investigated in the work.Optimum conditions for α-pinene isomerization reaction were as follows:reaction time 1-2 h,isomerization temperature 130℃±2℃,and the ratio of solid superacids to α-pinene 0.03(mass ratio).Under these conditions,α-pinene conversion was 96.58%,and camphene selectivity was 57.39%.Furthermore,the effect of storage time of the catalysts on the reaction was discussed,and the regeneration experiments of catalysts were carried out.

Key words: SO₄^2-/ZrO₂-TiO₂ catalyst, α-pinene isomerization, solid superacid