作　　者： ; ; ; ;

机构地区： 中南大学化学化工学院

出　　处： 《石油炼制与化工》 2013年第8期23-28,共6页

摘　　要： 以Ti(SO4)2和Zr(SO4)2为活性组分,以SiO2为载体,通过浸渍法制备复合固体酸催化剂Ti(SO4)2-Zr(SO4)2/SiO2。采用TG、酸量分析、FT-IR、XRD等方法对催化剂进行表征,考察焙烧温度、活性组分负载量对催化剂性能的影响。结果表明,催化剂制备的适宜条件为:焙烧温度300℃、焙烧时间3h、活性组分负载量50%。将制备的催化剂用于油酸甲酯的合成反应,在催化剂用量20g/mol、醇酸摩尔比4、反应时间5h、反应温度85℃的条件下,酯化率达到95.6%。催化剂的重复使用性能考察结果表明,在不经处理的条件下连续使用5次后,酯化率下降到80%以下。对失活催化剂的红外光谱分析结果表明,积炭是催化剂失活的主要原因,可通过焙烧、补充活性组分恢复其催化性能。 Silica-supported titanic sulfate and zirconium sulfate solid acid catalyst （Ti （SO4）2- Zr（SO4）2/SiO2） was prepared by impregnation method. The supported catalyst was characterized by TG, acidimetric analysis, FT-IR and XRD. The effects of calcination and loading amount on the catalyst activity were investigated. The results indicate that the catalyst prepared has a esterification rate of 95.6% at the conditions of a catalyst dossage of 20 g for 1 mol of oleic acid, a molar ratio of methanol to oleic acid of 4, a reaction temperature of 85 ℃ and a reaction time of 5 h. It is found after the catalyst was continuously used for 5 times, the esterification rate drops to below 80% because of coking,proved by infrared analysis of deactivated catalyst, but the activity of the catalyst can successfully recovered after activation by roasting and/or supplementing certain amount of active components needed.

关 键 词： 二氧化硅 硫酸钛 硫酸锆 负载型催化剂 油酸甲酯

领　　域： [理学] [理学]