Abstract: Supported heteropolyacid is not only conveniently used to separate catalyst from reaction system,but also to heterogenize of the homogenous reaction.Different methods were used to prepare the supported heteropolyacid,which catalyze
anisole and acetic anhydride to synthesis p -acetylanisole.The effects of HPW amount and calcined temperature to the catalytic activity were studied.The results showed that catalysts exhibited the best catalytic performance and the product yield is 68.5%,using adsorption method,catalyst 1 g,anisole 1 mol,molar ratio of anisole and acetic anhydride1：1.5,loading 40% amount of HPW and calcining at 150 ℃.Experiments of catalysis recycle illuminate that the catalysis could be reused,whereas the catalytic activity was connected with treated temperature and circumfluence time.The supported heteropolyacid was charactered by infrared spectra (IR) and X-ray diffraction spectrum (XRD).

Key words: Phosphotungstic acid ,     SiO₂ ,    , Anisole ,    , Acetic anhydride ,    , Acylation

摘要： 负载杂多酸不但有利于催化剂的分离,而且可以使均相反应多相化。以SiO₂ 为载体,通过不同的负载方法制备SiO₂ 负载磷钨酸催化剂,将其用于催化苯甲醚和乙酸酐发生Friedel-Crafts酰基化反应,合成对甲氧基苯乙酮,研究了催化剂的焙烧温度和负载量对催化反应性能的影响。实验结果表明,在催化剂质量为1g、苯甲醚为0.1mol,苯甲醚与乙酸酐的物质的量比为1：1.5,采用吸附法,磷钨酸的负载量为40%,焙烧温度为150℃时,催化剂的催化性能最好,产品收率达68.5%;催化剂的回收实验证明,催化剂可以再生重复使用,但回收催化剂的活性与处理温度和回流时间有关。并对负载磷钨酸(HPW/SiO₂ )进行了IR、XRD等表征。

关键词: 磷钨酸 ,  SiO₂ , 苯甲醚 , 乙酸酐 , 酰基化反应