固体酸催化剂在醇解聚对苯二甲酸乙二醇酯反应中的催化性能

采用浸渍法制备了SO4^2-／ZnO和S^4^2-／TiO2固体酸催化剂，用XRD、SEM等对催化剂的晶型结构和表面形貌进行了表征，并考察了它们降解聚对苯二甲酸二乙二醇酯制备对苯二甲酸二乙二醇酯的催化性能．实验结果表明，焙烧温度对SO4^2-／ZnO的催化活性影响不大，而对SO4^2-／TiO2的催化活性影响明显，随焙烧温度的升高，其催化活性出现先上升后下降的趋势反应时间、反应温度、催化剂浓度等工艺条件对两种催化剂活性的影响趋势是一致的.

Catalytic Property of Solid Acid Catalyst in Glycolysis of Polyethylene Terephthalate

Solid acid catalysts SO4^2-/ZnO and SO4^2-/TIO2 were prepared with wetness impregnation method,and calcined at different temperatures. The structural properties of these samples were investigated using XRD and SEM. The catalytic activity was tested by the depolymerization of polyethylene terephthalate （PET） with ethylene glycol （EG）. The experimental results indicate that the calcination temperature has little influence on the catalytic activity of SO4^2- /ZnO ,but has much influ- ence on the catalytic activity of SO4^2-/TiO2. As the calcination temperature increases ,the catalytic activity of SO4^2-/TiO2 first rises and then drops with the best＇catalytic activity reached at 340 ℃. The two solid acid catalysts show the same tendency in the conversion of PET and the yield of bis-2-hydroxyethy terephthalate （BHET） under the influence of different parameters, such as the reaction time ,the reaction temperature and the catalyst concentration.