改性二氧化硅负载离子液体催化合成2-(4-乙基苯甲酰基)苯甲酸  

Synthesis of 2-(4-ethylbenzoyl) benzoic acid over ionic liquids supported on modified-SiO_2

作　　者：张信伟[1] 艾秋红[1] 

机构地区：[1]湘潭大学化工学院,湖南湘潭411105

出　　处：《工业催化》2008年第8期54-59,共6页Industrial Catalysis

基　　金：湖南省自然科学研究基金项目(05JJ40002)

摘　　要：对负载离子液体催化乙苯与邻苯二甲酸酐酰化反应合成2-(4-乙基苯甲酰基)苯甲酸(BE酸)进行了研究。以A lC l3溶液和混合酸为改性剂,对二氧化硅载体进行改性,采用浸渍法制备系列负载离子液体,采用FT-IR、BET、SEM和XRD对催化剂进行表征,考察载体改性剂、负载温度和负载量对催化剂性能的影响,并对反应条件进行了优化。结果表明,负载型离子液体在催化合成BE酸的反应中有较高的活性,但目标产物BE酸的选择性较低。经过混合酸对载体改性后,邻苯二甲酸酐的转化率和BE酸的选择性达到100%和91.1%,催化剂综合性能明显提高。催化剂再生后,BE酸的选择性为88.92%。Supported ionic liquids were used as the catalyst for Friedel-Crafts acylation of ethylbenzene with phthalic anhydride to 2-（4-ethylbenzoyl） benzoic acid （BE acid）. The SiO2 supports were modified by AlCl3 solution and mixed acids. Several supported ionic liquids were prepared by impregnation method and characterized by means of FT-IR, BET, SEM and XRD. The effects of supports modification, prepa-ration temperature, loadings of ionic liquids, reaction temperature and catalyst dosage were investigated. The results showed that the supported ionic liquids catalysts exhibited high activity for the acylation reaction, while the selectivity to BE acid was very low. Phthalic anhydride conversion of 100% and selectivity to 2-（4-ethylbenzoyl） benzoic acid of 91.1% were attained after the supports were modified by mixed acid. The catalyst could be used repeatedly after regeneration and selectivity to BE acid of 88.92% was obtained after the catalyst was regenerated.

关 键 词：催化化学 离子液体 Friedel-Crafts酰化反应 2-(4-乙基苯甲酰基)苯甲酸 

分 类 号：O643.36[理学—物理化学] TQ203.2[理学—化学]