【摘要】 SO2-4/ZrO2-TiO2复合型固体超强酸催化剂对α-蒎烯异构化反应有很高的催化活性和较好的选择性。通过GC-MS分析,异构反应的主产物是莰烯,副产物主要是三环烯和α-松油烯,另有6种产物,含量在1%～6%。实验考察了该催化剂的制备条件如钛与锆物质的量比、硫酸浸渍浓度、焙烧温度对其催化性能的影响。结果表明,催化剂的制备条件不同,对莰烯选择性和α-蒎烯转化率有较大影响。适宜的催化剂制备条件是钛∶锆为4∶1、硫酸浓度0.5mol/L、焙烧温度600℃。用上述条件所制的SO2-4/ZrO2-TiO2复合型固体超强酸作为α-蒎烯异构化反应的催化剂。作者对影响反应过程的主要因素进行了探讨。优化的工艺条件:反应时间1～2h、反应温度130℃±2℃、催化剂用量3%。该条件下α-蒎烯转化率96.58%,莰烯选择性57.39%。此外,还考察了催化剂放置时间对异构产物的影响和催化剂重复使用情况。更多还原

【Abstract】 Solid superacids of SO^2-₄/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 SO^2-₄/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 SO^2-₄/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.更多还原