正己烷异构化Pt/SZA催化剂构效关系研究

采用等体积浸渍法制备了Pt/SZA固体超强酸催化剂，采用X射线衍射、N₂吸附-脱附、NH₃程序升温脱附等方法对催化剂进行了表征，并考察了超强酸高温处理和载硫量对其催化正己烷异构化性能的影响。结果表明：适宜的超强酸焙烧温度为550 ℃，催化剂载硫量（w）为3.15%，此时制备的Pt/SZA催化剂抑制了单斜晶相ZrO₂的生成，具有适宜的孔结构性质和较多的酸中心；在相同反应条件下，催化剂催化正己烷异构化活性最高，且具有优良的异构产物分布。

STUDY OF STRUCTURE-ACTIVITY RELATIONSHIP OF Pt/SZA CATALYST FOR n-HEXANE ISOMERIZATION

The solid super acid catalyst Pt/SZA was prepared by the equal volume impregnation method. The effects of calcination temperature on the crystal phase, pore structure and acidity of the catalyst were characterized by XRD, nitrogen adsorption and desorption, NH₃-TPD and other methods. The effect of calcination temperature and sulfur loading of the super acid support on the isomerization performance of the catalyst were also investigated. The results showed that the optimum calcination temperature was 550 ℃ and the sulfur content of the catalyst was 3.15%. Under this condition, the prepared Pt/SZA catalyst exhibited little monoclinic zirconia, more active sites of acid centers and suitable pore structure properties. The catalyst had the highest catalytic activity for the isomerization of n-hexane and excellent distribution of isomerization product distribution in the same reaction condition.